ME346C Advanced Techniques for Molecular Simulations
Transcription
ME346C Advanced Techniques for Molecular Simulations
ME346C Advanced Techniques for Molecular Simulations -- Syllabus Summer quarter, 2011-2012, 3 units, Stanford MW(F) 11:00-12:15pm, 200-305 Instructor: Wei Cai, caiwei@stanford.edu, http://www.stanford.edu/~caiwei Office hour: see coursework homepage TA: William (Billy) Cash, wcash@stanford.edu Office hour: see coursework homepage Course website: http://coursework.stanford.edu (official) (last modified 6/24/2012) Course objective The students will learn to perform free energy and free energy barrier calculations by molecular simulations, and understand the statistical mechanics basis of the computational methods. Methods for free energy calculation, such as thermodynamic integration (TI) and adiabatic switching (AS), will be applied to accurately predict the melting point of crystals. Methods for (free) energy barrier calculation, such as nudgedelastic band (NEB) and umbrella sampling (US), will be applied to predict the rate of rare transition events. Prerequisite: ME346A and B Relation with other courses The statistical mechanics basis has been introduced in ME346A Introduction to statistical mechanics. Basic molecular dynamics and Monte Carlo simulation techniques as well as how to use the MD++ program have been introduced in ME346B Introduction to molecular simulations. This is the first time ME346C is offered, even though the ME346ABC sequence have been contemplated for many years. Grading Policies The final grade is given based on a final score, which is computed from homework (20%), midterm project (40%) and final project (40%). Homework will be issued biweekly and due on Wednesdays in class unless otherwise announced. To be fair to all students, homeworks that are late by n days will have their grades multiplied by a factor f(n) = (0.8)n. Students are encouraged to discuss with and learn from others when solving the homework problems, but are required to write up the solution (including computer programs) individually. Each projects require a written report and a ppt presentation from each team. Students with a final score higher than 90 will receive an A. Homework problems involve programming and numerical calculations in Matlab, simulations using MD++, and theoretical problems. Homework reports are submitted in paper. Numerical codes are submitted electronically to coursework.stanford.edu. Textbooks and course materials Daan Frenkel and Berend Smit, Understanding Molecular Simulation: From Algorithms to Applications, 2nd ed. Computational science series; v.1, Academic Press, (2002). QD461.F86 Course lecture notes will be distributed in class and posted on coursework. The MD++ program and tutorial materials are available through a link on coursework. Tutorials of MD++ will be given in TA sessions (location to be announced). Other suggested readings: Vasily V. Bulatov and Wei Cai, Computer Simulation of Dislocations, Oxford University Press. Companion website: http://micro.stanford.edu/ Course outline Part I. 1. 2. 3. 4. 5. 6. Free Energy Methods Statistical Mechanics Basis (2 lectures) Thermodynamic Integration (1 lectures) Reversible Scaling (1 lecture) Free Energy of Solids (1 lecture) Free Energy of Fluids (1 lecture) Predicting Melting Temperature (1 lecture) Midterm project presentation Part II. Free Energy Barrier Methods 7. Rate of Rare Events, Nucleation Theory (2 lectures) 8. Energy Barrier Methods, Nudged Elastic Band (2 lectures) 9. Free Energy Barrier Methods, Unbrella Sampling (2 lectures) Final project presentation Important dates Mon 6/25 Wed Fri 6/27 6/29 7/2 7/4 7/6 7/9 7/11 7/13 7/16 7/18 7/20 7/23 7/25 7/27 7/30 8/1 8/3 8/6 8/8 8/10 8/13 8/15 8/17 8/20 Tentative topics Overview Stat Mech of Free Energy Thermodynamic Integration Reversible Scaling ------------------------------------------------------------------------------------------------Free Energy of Solids Free Energy of Fluids Melting Temperature ------------------------Student presentation Nucleation Theory ------------------------Energy barrier methods Energy barrier methods ------------------------Umbrella Sampling Umbrella Sampling ------------------------Applications Applications Student presentation ------------------------- *Exact dates of lectures may subject to change. 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Ceson']'aa t4x- frbfuh$;t'7 Uf G %) !a:*rv-t t^eau(tLt- */"gAb,rylr.md-rf ffi ' duu,fiuj th* f*q*^y n^*^JL X=c f/,e+,rr^n-(€/^a# *nti {f"tf C;ai,i;y sw,t'^"a) of w&^n"\ tlq s,gaW,a6/rb,r,ptu tt Uri4 tlLu a;a*;rg s*,r.{a'u (x:o) 'r wpt:.-ffiI Cu,rrbeTla-Bahnatf-*-fu* tuf fu eac'fr snce,bi prvfa-ft re? w/a ri ^r) c\ tlE3+6C /l Letu*6 +/ s/ap& Cw'/ 11 + ilecyoSJirrq fuutr" K - k" TST i"S f",r^n +" alw",yt (,t s.^1") fl,.A1-a/nh1-.rbn,@,ft. fi/ed-{.d+kn^fu . TsT ( HA)tltd,\'dth - )imu,{a,h:s/\ daft^, -fllv *-k{T mrqn yeaJo-rr r,.rthrut TSJ- +l'\!* IYY&t"fl+hs-+t^nxatrTlc $vid^y s,,u"{-^a C":-, W ruot aJ-l t*ie4+rri e,/ B* ko C,vvtl;n4 tl\4- d^rtd^*ngSvl.rfau c,cr.1lnb#o t^o a, frwn's.,.grnqWvrgr. wfizt: w + + c @ 3 S i n g . N r y o r 5 :l , # ,J fianl'livr , Mpq* = o (f-", t+&fr,W + .f cwy *S = 2 . M6yao + of {-ra/Y,4rfft^, N1*^-L t $w U4t -teryhr *45 A Yecnrurrrrgc^rr(eJ-b\ "S,lt 'lC Carnhe an"T*ihd ty arnd'V >o (ro+,:-gyE"(t*r* U.r#l sial+.'Yfvn^r x:g Shnrt nmrrtp'J"inns F".1"-rfurvCy*rrft lw^,lno*s *{J^ l*rt,l, '! .,*rfiL"i frazru:,dx''n As,,rcr "sf* ( : y'rAr\4,'ft? A W ,f t ;rrfrtl"lrl._,). 61z-1 + c'f fra'ns+nnJ t tuW# I w{stJrr r - l(Ctny)-Ld. n \ { S€et"{W?,, I anprAn r cr\ hwt[a1svK ) tArw$c vlt /tntz lrer,+wX7' C*i 1- Tbdng::go"l , Tran*; &b-u'r- Sh.fe ir'r L P 7-Ltn*uy f - F[,"x o.cro5,y ctnvid, rq sw,{*^e I x = o) bvwtJnn a h,ry. *dA.%nLto_ 4 .f thl s"#*tn ;i- d*,*,J rryd^cu | \:1 ,-nd e7un"/;tz;urrn- rs=f "tuhbeJ U t'l{e Ca,non)r^!- ( NVT) %4rtFnbb- I d^vrA;ry s,^,rjat+ 4t *g iufant, frherea/rcInnu rysCtn! {--g crrtttTtfr d^! d^V:duVt4 Swh"U- (X=-o ) {**iu klt cf, fu, x:',- t- x:or). p''rsr is the pwtrr"tn% fhf ilertt* wrw tnt4 " "f hn"id.ct{ a, s,na/} d{narn / \ K:.A (oo t J [-A, ct) X:Q tpwwviftut) h -('Af W {r^, T-rlth.Z Cam,svn'U{ (NOvrtW , tA4- pw/l""{rleq o{ {"dmq bh,t Sy:lort- in th,b d4Tn4am l) O ir - t - a .-t ^ r \- ,/ j,r,t' rf ,4 ^Jf rJl f"{j1-p/tmA h* r"*sq-w#i,t irr d,rde bjt * Ir J) f ( F a , o) : ',: f e f u c x )o r x f , rwtaevt s1"&. rwla-nb'J{"( : r^, eSU{xt ok ! J-oo *._ EPTT,A o v)-t)t-DJ lx iJ - p dfu {fur"f +,*a-Veh*bd Sv ti^4-,rt S,{:+*,w th't{ ;u,+fM A*t "t+LRt{ nfil,e{"ifuft+nwr,;tg*l';*qrrt (t',e 6a.oun^cJtfAhtlnt^h'-rh dpunl,+in'o s+B4.d"rld, e =,ffiY, fcu):#Egyr-#l ) )h!++ g&w+sg*krnt i!& C,'ft"'VJ {:o V 'of>o, a- vwm-o'*:f {'t fz* . ml Aar'L dtq pMi^"(. 6 ME3+bC 7fi slaotz Ca-L hYv;&w ^ shorf -ft,r,aP{l,",i [t . ile *,^{ i c."r?,*" h,,t*,*-T .+ ,WW J t[L {*--*t"^$nl- lxp.nJ vek6b? naovm$+,a +itt* Tl/,rp-*S4 l r U +,i\et c/w\4u )C-o ,(**,4 sAnrt V J +lvrb "ffut- trn -f{4!- *,#, fta, o) ,1- v S o z l f c vvrd v * 2 # J-so 7h,ptj-,rw, r'! v-e '%dv -Jft 5t Ir #t I: w)th-,'nrAt lo^e,w aN Sffs/ilrny f 6r|,t'.!-A-$ tt:_[+ q,.[t and wi-tlt4 t>wvs #a- d-rrluy st^/"^L vprl"r,;*O wif{ posr,lt:w_ "f+t ^yc(st T1"e prci,wtihhl tytry_ N ,sud\ tf f;^dh,fl, : ?,n*,-?([-a,ilf iJ-w" f ffiffi"{^* + rn:-l pos;i;veWhuf, dc-l-;,,e-Tft = +" l:* ePUu^'-()'*t^r, v"+[civr-r lyo?orfin'rd 'f +fu- b|t mstwrh,"tlt 9,,n (sl"*r41 frhr, pow{;hkw fl""rdv^ P,w> -T1u Jlt-'l-m T T '41 Sun4aJ,Er's +(lurr o'crn4 th-n-tl^"16Xn4 l) r ,TST l < _ (wrrs EI -g Ev on )J -=:q--7 TA forlngtfqr5) tvfi46c i . * - +/s/a,on (NwL f- C*'3 pa^'*',*avv f,*ehtri.L tJ #a,fu A ri flL zs: + l-3^')l,"* eyl {rpf}^tt'+()rxt-urnl ffiT * r( ursrt-_uw\ [ -) o" e'rP rL -)LTrnFsT ? t t * n- ,PEo W r.,r'' naT ,* : K . ,t )&trT -_- L v6 - _L wZ & A A, P(*r{t; a>aatv,* r1rtekTris p"rq dax,rca-{. ,f h . , he^rt.lnd-uy+,rthr,,rf / tl\-!-a,,tn*<x{rw>trncr*,qlb t'l1ir ,h *) I l* L {^tu t'^ \ tu+r;{vrr ,+ Zp. Not,' botLL tPE' a,,,J Za 6/re d*^rl/laitmW qaanh-kea K4T {o,s the- okl'.m*en.f T f"v1uc*T, so ir kTt' p, )-r*^*^', o.wy_*sl_ io Tsr onaU";+t,,'1,!y h ge^nu."{ Ze [v 7a) iS nnt or^tr-n,r't^tol,e Xn , ]-dowe$W,$ hlg etxpand L'lcxt arwmd thLloto!' wuWrrtum ucxt= u(xa; + !t< 6x-xatf-p$-N ffi w- ?? I t\-- >x,lxo t K: r*: | +oo : x uP(-*Y}<cx-+r) {x flJ^. W Th,P.n .- :-f z: A-jQffi *rf rc F : ffi:#, i@gI=4{tr : E - = _ f Jt% *"= J$ t=h o^g^lu,v fruf*j kTJ^,: tr ffi.ef" o:c;llnt-tv "f ,tt*,r,,rr*z (,uq,V+/' r4FX6c hl, nfii,) [{,r,,twtW k k <I ocY fu o,ccsu/vt.+r th-q-necyoaiy wer1,t3. is rhtlrdruc-ed i .ni 0 l tAtaK' KTsruMu*lrra"*0,1 yfuk il,,,!-t-y\^e-]%rnAiliq,1 K'kTsr vTST 4rI Gr'+ nq fbct"r 1< oss; RnrY 3 d 7/ t/;-otz r y L+ t, nod-urafuS,lt6rydnnrWng ah,&-(qqul, ryuJ Ll-ro,,g, -rLu> twwsr{f64 YTfu,,f -fts- ID gq,,(a,#67i 't'zrfan* oYr+fu"L L*nq+r^rlq, ' e-fi' c,i c'o' alr\f, un Y, J, fr; wA;U pdr is r\dA,frnd-lrr1t + /. ( 6 Yrsr (,'.e K<.t) in b#pLtAz M,ptFfuy,rg ( y- o) anJ s+ro-yd*W (N-*1 {^^r"t. 'u' (/+o; a, h)eak do,'t* hVr* C'nr*thr-tqft*, fial argurtd *nwL , : ; 4 ftrq(3 h M?J tl,a bawiw, rt /r;tf go bqa( anJ {Mi fuilrw€,^ tfu *"{, 3;{"fa nany *}nea bt'j*t- ,t' hsa eilru{f4*VT .^-a.fi^lo \ffiA. 6 . JJran,a +r tutb ruil.o 6rLp+ a!d'rn?;n.a (/- *) , : -f^rr^'t zh-ei,tafih T'f/* JUt/"- ,3 ,rt ryfW -,Rt/Lpan,J int *a'je**vup rean4bhs tln* ion ,f cL,f{us -,rhu'J riJ calk d #rL ,fnoLrdnw,tsh' {th:t, K: # (x cart be dgri'.redfia- t,rr:ffi ci,,hete e 7 t ' {, , r 1 ( : ? ; k-rkw-.siing fheovy) / I{u=- #1":, V/t&/z,olz ie"4rutc f ME346C Cwi5 Rufuin tta- Sp",tl4P''&-ij*ijrn,t 4 - (;um*t^ir) brrv'^r'* o,A *k{- B*lkzlv-DOriruo,T1""*,3 F*kq, ( nL+), *Eb-f BiCn-n*) Cfq15) becKtx-tlil'ry E.a N C^^/n4e/ LW M lvfin arns'd,aru c" dn'Scu*P"s ys+<rrn . /|:O, 1,,2,' - - ha': TLQ SWrL orl-L r^Lh-tia^Gfu-s1'^te * a"nd wp-are rytler'-wfedirv th4- ra'e- "f |ffi". 4*ft-f^, t&L4bliT^-)lr,ftA T/re-d,;Eawtt"Sryilavt rnag be ctn,t;d-eqd l I ;,- olb rt=l\ [-] I \ i \ I +/1!-tn g"m a,b,a,frtufNrxfun:lil\ "f, T"u*o" fLsin t A,r$ U l l ' I , Il=JI It+ t \ r ; \ > - t l v v L+ nail:f ^h" le a"fao1 ,,^fni by noll, (,1 . x. Tarabe -rhe nu,mbef ,f moLe.".I-ot" ,'4 a, \idf ,ate/t-l: lerf ,h a, llrtqJg rd;d^ ' Tlu- d^gna7v";rl ^bry -t/rL xc-^Xis i-r a,- Yq/r1.bm WiltK , 146alt-sl pyb u) 5 rofu. ul Vr"6"6thfi J p'"6o4t*hd + ra 4- noviy tA f (nta f-^ sJ^ffi, 4. l.e. we ltaJlt A. : P+ft) ,^rry /D ([-lt) ftw rkh il= R-U) dilu"Jkl hhrn,*- 6ap1j;fi64, nL-_=*.[ ( - - tIt I R+( n-t).gPLt(n-t> =- g crl) a FU r-urnrl R+U1) r'.€;FlU(r \(- rn t -lu m - D J l u r n k - c h ): R + ( n -) te P e,g-P-(t): Rtfo) , U,=Q(t),Llo:g1l, "Pfu'-Lt'') C T/\E}+6 Ltc/'r,,,u +/!sfutz Cu6 f: Le,t P(nft) be+t,!-pr,rh$^r{,^+2 ^t tJ",bn s,gs}+r* { fi.&'y ++r!I t" +Vs ci*r'li{-6 d,rup}t,lof srn n ) ( c6r{vYcnJ.rng "f be t'w Lut- [U,t) n-r i n;= n " /---1/-l-\, u,f f[rx I I S----q-*--z- I \ ft n-r) I ,1,n, SeeKfteadgd*te ibhfil -Jf J : I t / n tI I t t - ''5f /l-g " t ' - : -.sf fl:l l - fh-r,t1- I (n,t) #f[n,ti Jcn,1:) (rro fi)ru alTondwna)Nf!)4 ltnS:Jl"r^ll,rrt P ( n ) R + ( n ) P ( n r t )R - ( n r)t - Pu),(Q,-u"\' ol lPt'tt ) - c t )= R+( l(o) R+b) P , ( t R )e8', {?u" R+(o).U,crle?u'?ct I Pt t ) R + [ o pCztR-[>,t u'l d 1 3 ' I R +t r ) ' f t r r . r € P uf rtz; - gfl J p(N) * fuur RrtM{)Lf(mePq+L ep'/Y t|t il: N- l. {"". slo,fl rL +' t]6frr n+i J Jtt e-FU,.Rt(o) J,I gPu' R+ {l ) Jrt g{q*'. R+C trl"r) Rf f^ f r 1 n , .\ , P Y ' ^ ' [ \" ) w pro eQu' t{' gPu' c.l cr.l e€ P P p(r'r-r) ePut-p(N)gFQ^r arll,oll t+qetl,wt'/ € I A \ z=o -Pun 'J"= f(ote\u" ) R*(rJ u" pl,,,ef iv\Ey{c -. {s-r'd,ifi#{il fuund""1 ;fU" v = ?fc,, v , 7: Wol , f $t {t n'' r a /r r -Btl |r ^-BUr Eo t e P-rL. R+tI}) if ,l.l w-we4 5L* Tst J : -rst d if I I * **nu g P* giPrr(n-n*)', R+(nr) ('* , ^- *-PK5cn-n*)' dn e R*cn*;I J-w * *u-' r-- R*tn*;'LK, - _j_dE 2\- lJ Cn) nt*r "J*n KsT /t:s i..t ^lao ilRnL 2=W r -J E._ (J J s r :Et'lr rst J J-an6T : trl- Z r+* otrr \ J-ro anrd a/StwyntR+(D xQ+h*) + \\\ - L -tturb h - n txv) ,L/ Et Ucnl: '--' aiti, rt FL{t, T%br +xPand' Ucn) ry'r$,'^/nd n/r, I \-f l oonfnb^lr'nb t/"+S*w cfrnpA ft r* tfu 'Lprwtt ThL di1ilr Mruf fWdJ> fL: o ) 8e*be,r-so'rf1 ,€/uJ* c a-a+be ,*/"$nd k 144 { nf, is a mcN<in*m \ Y W /, Ir=W ( isco{/ed s-- ldtrt(BT -fVt "'ZdU^frr,,ioh .,t-r ayyr"X'nr$<J bJ /lwzrrhrwtcAr1tr,y. uA-u-L t'\r K=fut Dtl^_-o ,gEr.Ro(nr) L- (h*) (r ffi.e-P€. Y ,rrelocol S g* gI -u"l 'n{arjJrr 'r ,{;h rt ( e iun/ L 11eo Naet e\un y - ta4 t' '| ^ .!u'*p\it) : c Tl;s rJ th& @ f T/tSftnlJ Le.{ttLL 7 cre* f ,ls ME346C T/ e/rotz krtluwf & CuuuitL *fui TSf re,r,,,,{yf c,rnne,*}rn tr rnotKu t"t LO^?** Utr**.'U,,n, nof"n_ ttLN? R*(n*; i t ye{ad-C +- Jfi^"* rf,y'^,l,rj +twrJ-ax,,f (n- c^t \ // LT {,^ra.t"k tW tS f'.. ra/nd,.'"n , W tVtl+tA l**u* l\/otr,, p= f[R+cn*lt K-cn*l]:Rtcn*) ( t"r'* e=| ) l fu tt^-t sa4l!e-{iw{-g, fj4: hg)1oSre,{r',*r'" be wi rt'a t KsT r\ vY^y rSL J : rt*f,'t rny K - L<t, -B El g' aTY*T"- -IE cA)D J-E- =rs+ CJo t^Ju U KBT f,*Cn*)- k-- & r Y dFq -t<*1 mY lTr -2 v[ A ) n1= { l * um (i/u4-,,4 t" +hn-ru,^-{* tn\. p.+ bat*d rn TST with k *rr+q ) [ fl ,./"*tr"e* i l'4€3+,5i. ! t / O a0 .AA -4 \J lhS/z-tz Eo*,f. Tfa-r,s I h'd-t{- Jf'n-'fu 1 t'-t2*g4r:-,i -t ,'rt t l r -. l L..r t / LAl W*i] 2' ., 3N-D lrrffT_*,: 1?_ ps,,1,.;i4,,6 Cpil*'d,s'{" a, 2D p"le-",,lt"lii {",*u*w*_ { lLnllto.l;z i ) UU,J)=t ecxL-e)L {+(l-x'-y')t* + [ , r r - y " ) , ' - ' _+] t [ ( r - y . , ' _ , ] ._ Z \ Ie ha-1 tarb {":c"t h^.inin,:,, - ^F : {-f , o), 118 fg = (9, o) F I N D I N G T R A N SI T I O N P A T H W A Y S Saddleridge - Nrt.o/10s (b) (a) 1 0 x 1 (c) Ft c' 7.1. (a)A two-dimensional potrential energyfunctionUt (x, y). Thetwometas t a b l e s t a t eAs ,f o r - r < 0 a n d B f b r ; r > 0 , a r e s e p a r a t e d a b ryi O g , a t x : 0 . S r and Szmark the locationsof two saddleson theridge.(b) Instaniurr"ous values of coordinate x in an MC simulartion at knT Q.tj. (c) The microstates (dors) visitedduringtransitions betweenA andB plottedon top of thecontourlinesof U (x,y), The solid(dashed,) line connecting two energyminimais theminimum energypathobtainedby sreepest descentfrom saddlesr (sz). Tlw da'vida'ny sw,Jr,t*(rv faiJ {yy;rtgil , x:e, 7D tyd-LL r4 *,3 '{E"{ro PlS.ftnf' : *kt d,irir{,*;s A am I B. * , { x <o ) S(aru{rruV fr*u a4,t4 poirt t u* Stey*'tuf ,Lt rc&*,*,t" f ohh wi(( B. (x>ol tfurry {rvn a:ntj yorttf lLaLa-a,nd f.{{owtE ^ Sl-wfs"r+ d-e,JL&,,,,-* La-^{ S.z yaa-#nwiil il*y: y,t,* {g - rt {,1{I,oi= J{:t}= an,t,{rt')*t|aa q k^c(6 po,r.f f6 "i-*^W r n I 'L MeS+bC k"tw,wE hswrytL +l^-s.-Spkrn- td,ffir^'g A- 725/z'rz Coz,2_ +hy Lwqw,ih- ff aa;.-i1n. 1-- r T c t t- W c t ) qct)= wct.r J 7 rntl tt) : - hl y \r-ct,l t h\ftf ):--hYrtr+t F,lrt-tl t at/tr:Y, pztt) _ >Llt\y) >y ( K ;f t ) 7 : o I'a, \ ( R i L + ) E ( t ) > : Z v n K r - l - y [ t t r{ , . i & ,$.'u*fo or {3 [i-t. ttw sys:}enrr Sp.u.rdz ,rw,t 4 +lLt-*irrree,\fi.md. 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E^*x, ffrrsre-fin\na$-/rQ^ - f+,no'J iF ucc+fT wr-tLu yru$=k|.q P * * = - € rrp\( - ? : * *hi lrX ) ) \ ,)' RUNt#"k 1 o;-n-r, uulr\-L4 dlM-g ( :fr ,tnp(-xq-) , S;nrr,ic.-+='x., ME346C Lecture 10 8/1/2012 Cai Adatom Diffusion on Au Surface Wei Cai 8/1/2012 Department of Mechanical Engineering, Stanford University, Stanford 94305-4040 1. Prepare Au (111) Surface The atomistic calculations below will be based on the EAM Foiles potential for Au. The tcl file can be download from ME346C Coursework web site. bin/eam_mc2 scripts/work/au/au_surface_atom.tcl 0 A perfect FCC crystal of Au is created with dimensions: 4[1 -2 1] x 4[1 0 –1] x 3[1 1 1] (1152 atoms). A 1.4% bi-axial compressive strain is applied in the x and y directions. (Otherwise the surface is under a large tension stress and adatoms will tend to be incorporated into the top surface instead of staying on top of it.) Figure 1. Au (111) surface. The top surface layer atoms are in orange. Click on the atoms to get the (scaled) coordinates of various sites on the (111) surface. These coordinates will be used in step 2. 2. Add One Adatom to Au (111) Surface bin/eam_mc2 scripts/work/au/au_surface_atom.tcl 1 One more atom is added on top of the (111) surface. The total number of atoms is 1153. There are two different types of sites to put the adatom: type A and type B. We create four different structures: A, Ap, B, Bp. A and Ap are of the same type. B and Bp are of the same type. The structures are saved in folder runs/au-surf-1-0-0. 1 2 Ap Bp B A Figure 2. Orange atoms are the top layer of Au (111) surface. There are two types of sites (type A and type B) for adatom, both avoiding the orange atoms. A, Ap are equivalent sites. B, Bp are equivalent sites. A B Ap Bp Figure 3. For different adatom structures created by MD++. 3. Find Minimum Energy Path The string method is used to search for the minimum energy path between state A (or Ap) and state B (or Bp). bin/eam_mc2 scripts/work/au/au_surface_atom.tcl 2 A B or bin/eam_mc2 scripts/work/au/au_surface_atom.tcl 2 A Bp Figure 4 shows the energy profile for minimum energy path (after 1000 step of stringrelax) between different states. 3 Plot energy profile: cd runs/au-surf-2-A-B octave data=load('stringeng.out'); plot(data(end-10:end,3:5:end)', '*-'); xlabel(‘replica ID’); ylabel(‘Energy (eV)’); Figure 4. The energy profile for adatom migration on Au (111) surface. From these calculations, we see that the energy difference between the two adatom sites is: EB - EA = 0.065 eV The energy barriers for the jump are (approximately): E* - EA = 0.083 eV E* - EB = 0.018 eV The calculation can be repeated with more relaxation steps to make sure the results have converged. It is also of interest to find out whether there are multiple transition paths ways between meta-stable states (e.g. between A and B). Further Reading: R. C. Jaklevic and L. Elie, Scanning-Tunneling-Microscope Observation of Surface Diffusion on an Atomic Scale: Au on Au(111), Phys. Rev. Lett. 60, 120–123 (1988) http://prl.aps.org/pdf/PRL/v60/i2/p120_1 au_surface_atom.tcl 1/5 ~/Codes/MD++.svn/scripts/work/au/ 08/05/2012 # −*−shell−script−*− # compute energy barrier of surface atom diffusion in FCC Au # # make eam build=R SYS=mc2 source "scripts/Examples/Tcl/startup.tcl" #******************************************* # Definition of procedures #******************************************* proc initmd { status n m } { #MD++ setnolog MD++ setoverwrite MD++ dirname = runs/au−surf−$status−$n−$m MD++ NNM = 200 } #−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− proc readeam { material } { #Read in MEAM potential (MD++ format) MD++ potfile = "~/Codes/MD++/potentials/EAMDATA/eamdata.${material}Foiles" MD++ eamgrid = 500 readeam NNM=300 MD++ element0 = $material } proc make_perfect_crystal { nx ny nz } { MD++ crystalstructure = face−centered−cubic latticeconst = 4.08 MD++ latticesize = \[ 1 −2 1 $nx 1 0 −1 $ny 1 1 1 $nz \] MD++ makecrystal #finalcnfile = perf.cn writecn #eval } proc make_dislocation_loop { } { # create structure B’ set bz [expr −0.5/ [MD++_Get latticesize(11)] ] MD++ input = \[ 3 1 0 0 $bz 0.02 −0.25 0.25 0.3 −10 10 −10 10 1 MD++ makedipole } 1 −0.25 0.25 0 \] #−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− proc relax_fixbox { } { MD++ { # Conjugate−Gradient relaxation conj_ftol = 1e−4 conj_itmax = 1000 conj_fevalmax = 1000 conj_fixbox = 1 relax } } #end of proc relax_fixbox #−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− proc relax_freebox { } { MD++ { # Conjugate−Gradient relaxation conj_ftol = 1e−4 conj_itmax = 1000 conj_fevalmax = 1000 conj_fixbox = 0 conj_fixboxvec = [ 0 0 1 1 0 1 0 0 0 ] relax } } #end of proc relax_freebox proc setup_window { } { MD++ { #−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− #colors for Central symmetry view color00 = "red" color01 = "blue" color02 = "green" color03 = "magenta" color04 = "cyan" color05 = "purple" color06 = "gray80" color07 = "white" color08 = "orange" #−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− # Plot Configuration # atomradius = [0.7 0.78] bondradius = 0.3 bondlength = 0 #2.8285 #for Si win_width=600 win_height=600 #atomradius = 0.9 bondradius = 0.3 bondlength = 0 #2.8285 #for Si atomcolor = cyan highlightcolor = purple bondcolor = red au_surface_atom.tcl ~/Codes/MD++.svn/scripts/work/au/ 2/5 08/05/2012 fixatomcolor = yellow backgroundcolor = gray70 #atomcolor = lightgrey highlightcolor = purple bondcolor = darkgrey plot_color_axis = 2 NCS = 12 plot_color_windows = [ 5 0.6 10 1 10 20 6 20 80 8 80 5000 5 0 0.6 4 ] #plot_limits = [ 1 −10 10 −10 0.35 −10 10 ] #plot_color_windows = 0 plot_atom_info = 1 # reduced coordinates of atoms #plot_atom_info = 2 # real coordinates of atoms #plot_atom_info = 3 # energy of atoms #plot_highlight = [ 0 0 1 2 3 4 5 6 7 8 9 ] plotfreq = 10 # #rotateangles = [ 0 0 0 1.7 ] #rotateangles = [ 0 −90 0 1.7 ] #openwin alloccolors rotate saverot plot #plot_color_axis = 0 input = [ −8 −3 10] GnuPlotHistogram #plot_color_axis = 2 input = [ 0.6 50 50 ] GnuPlotHistogram } } proc openwindow { } { setup_window MD++ openwin alloccolors rotate saverot eval plot } #−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− proc exitmd { } { MD++ quit } #end of proc exitmd #−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− #−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− proc setup_md { } { MD++ { equilsteps = 0 timestep = 0.001 # (ps) atommass = 196.96655 # (g/mol) DOUBLE_T = 1 totalsteps = 1000 saveprop = 1 savepropfreq = 100 openpropfile #run savecn = 1 savecnfreq = 10000 openintercnfile plotfreq = 100 printfreq = 100 ensemble_type = "NVT" integrator_type = "VVerlet" implementation_type = 0 vt2 = 1e28 #1e28 2e28 5e28 wallmass = 2e3 # atommass * NP = 14380 boxdamp = 1e−3 # optimal damping for 216 atoms and wallmass 1e−3 saveH # Use current H as reference (H0), needed for specifying stress fixboxvec = [ 0 0 1 1 0 1 0 0 0 ] output_fmt = "curstep EPOT KATOM Tinst HELM HELMP TSTRESS_xx TSTRESS_yy TSTRESS_zz H_11 H_22 H_33 " } } #end of proc setup_md #******************************************* # Main program starts here #******************************************* # status 0: # 1: # 2: # # read in status from command line argument if { $argc == 0 } { set status 0 } elseif { $argc > 0 } { set status [lindex $argv 0] } puts "status = $status" au_surface_atom.tcl 3/5 ~/Codes/MD++.svn/scripts/work/au/ if { $argc <= 1 } { set n 0 } elseif { $argc > 1 } { set n [lindex $argv 1] } puts "n = $n" if { $argc <= 2 } { set m 0 } elseif { $argc > 2 } { set m [lindex $argv 2] } puts "m = $m" if { $status == 0 } { # create initial structure with (111) surface MD++ setnolog initmd $status $n $m readeam Au make_perfect_crystal 4 4 3 setup_window openwindow relax_freebox MD++ eval MD++ finalcnfile = "au−perf.cn" writecn # make surface MD++ input = \[ 3 3 0.5 \] changeH_keepR # apply bi−axial compression MD++ input = \[ 1 1 −0.014 \] MD++ input = \[ 2 2 −0.014 \] changeH_keepS changeH_keepS relax_fixbox MD++ eval plot #setup_md #MD++ T_OBJ = 30 initvelocity totalsteps = 1000 run #relax_fixbox MD++ finalcnfile = "au−surf.cn" writecn # click on atoms to get (sx,sy) coordinates of sites A, B, C MD++ sleep exitmd } elseif { $status == 1 } { # put adatom on surface # prepare and relax dislocation structure MD++ setnolog initmd $status $n $m readeam Au # allocate more memory than needed because we will add atom later MD++ allocmultiple = 2 MD++ incnfile = "../au−surf−0−0−0/au−surf.cn" readcn set set set set n [MD++_Get "NP"] indx [expr $n*3 ] indy [expr $n*3+1] indz [expr $n*3+2] # add one more atom on surface (site A) MD++ NP = [expr $n + 1] 08/05/2012 au_surface_atom.tcl ~/Codes/MD++.svn/scripts/work/au/ setup_md # put new atom MD++ SR($indx) MD++ SR($indy) MD++ SR($indz) on = = = site A 0.0416 0.0 0.35 setup_window openwindow relax_fixbox MD++ T_OBJ = 30 initvelocity totalsteps = 1000 run relax_fixbox MD++ finalcnfile = "au−surf−A.cn" writecn MD++ finalcnfile = "au−surf−A.cfg" writeatomeyecfg # put new atom on site B MD++ incnfile = "../au−surf−0−0−0/au−surf.cn" readcn MD++ NP = [expr $n + 1] MD++ SR($indx) = 0.0 MD++ SR($indy) = 0.0 MD++ SR($indz) = 0.35 relax_fixbox MD++ T_OBJ = 30 initvelocity totalsteps = 1000 run relax_fixbox MD++ finalcnfile = "au−surf−B.cn" writecn MD++ finalcnfile = "au−surf−B.cfg" writeatomeyecfg # put new atom on site Ap MD++ incnfile = "../au−surf−0−0−0/au−surf.cn" readcn MD++ NP = [expr $n + 1] MD++ SR($indx) = −0.0208 MD++ SR($indy) = 0.0625 MD++ SR($indz) = 0.35 relax_fixbox MD++ T_OBJ = 30 initvelocity totalsteps = 1000 run relax_fixbox MD++ finalcnfile = "au−surf−Ap.cn" writecn MD++ finalcnfile = "au−surf−Ap.cfg" writeatomeyecfg # put new atom on site Bp MD++ incnfile = "../au−surf−0−0−0/au−surf.cn" readcn MD++ NP = [expr $n + 1] MD++ SR($indx) = 0.0625 MD++ SR($indy) = 0.0625 MD++ SR($indz) = 0.35 relax_fixbox MD++ T_OBJ = 30 initvelocity totalsteps = 1000 run relax_fixbox MD++ finalcnfile = "au−surf−Bp.cn" writecn MD++ finalcnfile = "au−surf−Bp.cfg" writeatomeyecfg MD++ sleep exitmd } elseif { $status == 2 } { # find minimum energy path for dislocation loop nucleation MD++ setnolog initmd $status $n $m readeam Au MD++ incnfile = "../au−surf−1−0−0/au−surf−$n.cn" readcn saveH MD++ incnfile = "../au−surf−1−0−0/au−surf−$m.cn" readcn restoreH SHtoR setconfig2 MD++ incnfile = "../au−surf−1−0−0/au−surf−$n.cn" readcn readcn setconfig1 setup_window #openwindow MD++ eval MD++ fixallatoms constrain_fixedatoms freeallatoms MD++ chainlength = 25 totalsteps = 1000 4/5 08/05/2012 au_surface_atom.tcl ~/Codes/MD++.svn/scripts/work/au/ 5/5 08/05/2012 MD++ timestep = 0.01 printfreq = 2 MD++ allocchain initRchain # nebspec = [ relax_surounding_atoms reparam_freq fix_left_end fix_right_end climb_image] MD++ { nebspec = [ 0 1 1 1 1 ] stringrelax } MD++ finalcnfile = stringrelax.chain.cn writeRchain #MD++ sleep exitmd } elseif { $status == 3 } { exitmd } elseif { $status == 4 } { exitmd } elseif { $status == 10 } { # visualization MD++ setnolog initmd "view" $n $m readpot MD++ incnfile = "../au−surf−1−0−0/au−surf−$n.cn" readcn saveH MD++ incnfile = "../au−surf−1−0−0/au−surf−$m.cn" readcn restoreH SHtoR setconfig2 MD++ incnfile = "../au−surf−1−0−0/au−surf−$n.cn" readcn readcn setconfig1 MD++ zipfiles = 0 for { set iter 0 } { $iter <= 25 } { incr iter 1 } { MD++ incnfile ="../w−disl−nuc−${strain_yz}/stringrelax.chain.cn" readRchain # 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