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1. LVTOT=TRUE³ýÁ˶ÔslabÌåϵ£¬ÄÜÓÃÓÚbulkÌåϵô

2. ż¼«¾ØÐÞÕýIDIPOL=3ÔÚËãbulk defect µÄʱºòÐèҪô£¿

3.Charged surface/interface¿ÉÐÐô£¿¼´ÊÇ·ñ¿ÉÒÔvasp¼ÆËã´øµçµÄ±íÃæ½çÃæslab£¿ÒÔ¼°ÊÇ·ñ¿ÉÒÔ»­±íÃæ¡¢½çÃæÌåϵµÄÐγÉÄÜvs·ÑÃ×Äܼ¶µÄͼ

4. ¼ÙÉèij²ÄÁϵÄPBEÏÂbandgapÊÇ2eV£¬HSEÐÞÕýºóÊÇ3ev£»pbeϵÄÔÚCBMÒÔÏÂ0.5eVÓÐÒ»¸ögap state£¬hseÐÞÕýºóÕâ¸ögap stateµÄλÖ㨴Ódos¡¢band¼ÆËãµÄgap state£©ÊÇ0.5*3/2ÕâÑùµÄÏßÐÔmodificationÂð£¿
5. ¼ÙÉèij²ÄÁϵÄPBEÏÂbandgapÊÇ2eV£¬HSEÐÞÕýºóÊÇ3ev£»pbeϵÄÔÚCBMÒÔÏÂ0.5eVÓÐÒ»¸ö(0/-)µÄtransition level£¬hseÐÞÕýºóÕâ¸ö(0/-) transition levelµÄλÖÃÊÇ0.5*3/2ÕâÑùµÄÏßÐÔmodificationÂð£¿
6. ÉÏÃæ4ºÍ5µÄ½áºÏ£º¿éÌåµãȱÏÝ·ÖÎö¼ÆËã³öÀ´µÄtransition level£¨Ô¾Ç¨Äܼ¶£©ºÍdosÀïÃæµÄtrap level (ȱÏÝÄܼ¶»òÕßÏÝÚåÄܼ¶£©ÓÐÈκιØϵô£¿

7. ËãȱÏÝÐγÉÄܹ«Ê½ÖÐÓÐÒ»¸ödelta VÐÞÕýÏ¼ÆËãÖÐÔõô¾ßÌåÈ·¶¨Õâ¸öÊýÖµ

8.¹ØÓÚÈçºÎ°Ñ¼ÆËãµÄ(ÀíÏ룬δ²ÎÔÓ)°ëµ¼ÌåµÄCBM VBMÓëvacuum level¶ÔÆë, ÎÒÄÜÏëµ½ÓÐÁ©·½·¨£º
(1). ËãÍê×ÔÇ¢²½£¬OUTCARÀïÃæ¾ÍÓÐvacuum levelµÄÊýÖµ£¬Í¬Ê±¿ÉÒÔÔÚoutcarÀïÃæ¶Á³öÀ´VBM CBMµÄÊýÖµ£¨Gammaµã´¦×î¸ßÌîÂúµÄbandºÍ×îµÍδÌîÂúµÄband£©£¬ºóÕß¼õȥǰÕß¾ÍÊÇVBM¡¢CBMÏà¶ÔÕæ¿ÕÄܼ¶£¨°ÑÕæ¿ÕÄܼ¶ÉèΪ0£©µÄλÖã»
(2).Óù¦º¯Êý¶ÔÆ룬¹¦º¯ÊýÊÇÕæ¿ÕÄܼ¶Óë·ÑÃ×Äܼ¶µÄ²î£¬¶ø¿ÉÒÔÔÚoutcarÀïÃæ¶Á³öÀ´·ÑÃ×Äܼ¶¡¢VBM¡¢CBMÈýÕßµÄÊýÖµ£¬Óù¦º¯Êý×öУ׼£¬¾Í¿ÉÒԵõ½Õæ¿ÕÄܼ¶ÔÚ0eV´¦µÄVBM CBMλÖá£
ÇëÎÊÕâÁ©·½·¨ÓÐʲôÇø±ðô£¿»¹ÊÇ˵ÄÄÒ»ÖÖ¶¼¿ÉÒÔ~

9. E(formation energy) vs Fermi levelÕâ¸öͼµÄºáÖáºÍ×ÝÖáÔõôÀí½â

10. Band edge (±ÈÈçCBM)µ½£¨q/q+1£©µÄÄÜÁ¿²î¾ÍÊǶÔÓ¦µÄ·øÉä·¢¹âµÄ²¨³¤Ã´£¿ºÃÏñÓÐÈËÌÖÂÛ˵(q/q+1)µÄtransition levelÊÇthermodynamic transition level£¬¸úoptical transition levelÊDz»Í¬µÄ¡£µ«ÊÇÒÀÈ»¿´µ½ÓкܶàÈËÖ»ÊÇËãÁË£¨q/q+1£©µÄλÖÃÈ»ºó¾Í¿ªÊ¼ÌÖÂÛ·øÉä·¢¹âÁË£¬ÊÇ·ñºÏÀí£¿
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1. LVTOT=TRUE³ýÁ˶ÔslabÌåϵ£¬ÄÜÓÃÓÚbulkÌåϵô
> LVTOT µÄÓÃ;ÊÇÃüÁî VASP Ý”³ö LOCPOT ß@‚€™n°¸ (potential)
   ¸úÄãÓ‹ËãʲüNówϵÊÇŸoêPßBÐÔµÄ
   ¾ÍËãÄãÖ»ÊÇËã†ÎÒ»îwÔ­×Ó£¬Ò»˜ÓÒ²¿ÉÒÔ½o LVTOT£¬È»ááµÃµ½ local potential


2. ż¼«¾ØÐÞÕýIDIPOL=3ÔÚËãbulk defect µÄʱºòÐèҪô£¿
> ֻҪϵ½yÓЮaÉú dipole£¬¾Í¿ÉÒÔÓÃß@‚€ dipole correction
    ËùÒÔÄ㑪ԓҪ˼¿¼µÄÊÇ£¬bulk defect ÊÇ·ñ•þ®aÉú dipole


3.Charged surface/interface¿ÉÐÐô£¿¼´ÊÇ·ñ¿ÉÒÔvasp¼ÆËã´øµçµÄ±íÃæ½çÃæslab£¿ÒÔ¼°ÊÇ·ñ¿ÉÒÔ»­±íÃæ¡¢½çÃæÌåϵµÄÐγÉÄÜvs·ÑÃ×Äܼ¶µÄͼ
> ¿´²»¶®ß@î}


4. ¼ÙÉèij²ÄÁϵÄPBEÏÂbandgapÊÇ2eV£¬HSEÐÞÕýºóÊÇ3ev£»pbeϵÄÔÚCBMÒÔÏÂ0.5eVÓÐÒ»¸ögap state£¬hseÐÞÕýºóÕâ¸ögap stateµÄλÖ㨴Ódos¡¢band¼ÆËãµÄgap state£©ÊÇ0.5*3/2ÕâÑùµÄÏßÐÔmodificationÂð£¿
> ²»ÊÇ
    HSE ÐÞÕý²»ÊÇÖ»†Î¼ƒŒ¦ empty state ÐÞÕý
    ¶øÊÇ empty & filled states ¶¼ÓÐÐÞÕýµ½
    ËùÒÔ²»ÄÜÓþ€ÐÔÈ¥îAœy


5. ¼ÙÉèij²ÄÁϵÄPBEÏÂbandgapÊÇ2eV£¬HSEÐÞÕýºóÊÇ3ev£»pbeϵÄÔÚCBMÒÔÏÂ0.5eVÓÐÒ»¸ö(0/-)µÄtransition level£¬hseÐÞÕýºóÕâ¸ö(0/-) transition levelµÄλÖÃÊÇ0.5*3/2ÕâÑùµÄÏßÐÔmodificationÂð£¿
> ͬÉÏ£¬²»ÊǾ€ÐÔ


6. ÉÏÃæ4ºÍ5µÄ½áºÏ£º¿éÌåµãȱÏÝ·ÖÎö¼ÆËã³öÀ´µÄtransition level£¨Ô¾Ç¨Äܼ¶£©ºÍdosÀïÃæµÄtrap level (ȱÏÝÄܼ¶»òÕßÏÝÚåÄܼ¶£©ÓÐÈκιØϵô£¿
> ß@ÒªÏȆ–£¬ÄãÖªµÀ CTL & DOS µÄº¬Òâ‹ß?
    Èç¹ûß@ƒÉ‚€–|Î÷Ä㶼Äܲt½â£¬ÎÒÏëÄ㑪ԓ²»•þ†–ß@†–î}ÁË


7. ËãȱÏÝÐγÉÄܹ«Ê½ÖÐÓÐÒ»¸ödelta VÐÞÕýÏ¼ÆËãÖÐÔõô¾ßÌåÈ·¶¨Õâ¸öÊýÖµ
> ÓÐÔS¶àGROUPŒ¦ß@‚€ÐÞÕýí—Ϻܶ๦·ò
    Ò²¾ÍÊÇÕf£¬ÌŽÀíµÄ·½Ê½ÓÐÔS¶à£¬¶à¿´Ð©ÎÄÕ°É
    J. Phys. C: Solid State Phys. 18, 973 (1985)
    Phys. Rev. B 51, 4014 (1995)
    Physica B 340-342, 407-411 (2003)
    Phys. Rev. Lett. 102, 016402 (2009)
    Phys. Rev. Lett. 110, 095505 (2013)
    Phys. Rev. B 89, 195205 (2014)
    (ß@Ö»ÊDZùɽµÄÒ»½Çѽ)

8.¹ØÓÚÈçºÎ°Ñ¼ÆËãµÄ(ÀíÏ룬δ²ÎÔÓ)°ëµ¼ÌåµÄCBM VBMÓëvacuum level¶ÔÆë, ÎÒÄÜÏëµ½ÓÐÁ©·½·¨£º
(1). ËãÍê×ÔÇ¢²½£¬OUTCARÀïÃæ¾ÍÓÐvacuum levelµÄÊýÖµ£¬Í¬Ê±¿ÉÒÔÔÚoutcarÀïÃæ¶Á³öÀ´VBM CBMµÄÊýÖµ£¨Gammaµã´¦×î¸ßÌîÂúµÄbandºÍ×îµÍδÌîÂúµÄband£©£¬ºóÕß¼õȥǰÕß¾ÍÊÇVBM¡¢CBMÏà¶ÔÕæ¿ÕÄܼ¶£¨°ÑÕæ¿ÕÄܼ¶ÉèΪ0£©µÄλÖã»
(2).Óù¦º¯Êý¶ÔÆ룬¹¦º¯ÊýÊÇÕæ¿ÕÄܼ¶Óë·ÑÃ×Äܼ¶µÄ²î£¬¶ø¿ÉÒÔÔÚoutcarÀïÃæ¶Á³öÀ´·ÑÃ×Äܼ¶¡¢VBM¡¢CBMÈýÕßµÄÊýÖµ£¬Óù¦º¯Êý×öУ׼£¬¾Í¿ÉÒԵõ½Õæ¿ÕÄܼ¶ÔÚ0eV´¦µÄVBM CBMλÖá£
ÇëÎÊÕâÁ©·½·¨ÓÐʲôÇø±ðô£¿»¹ÊÇ˵ÄÄÒ»ÖÖ¶¼¿ÉÒÔ~
> ÀíÕ“ÉÏ£¬ÔÚ wide-bandgap system Ñe Fermi level ¾ÍÊÇ VBM
   Ó‹ËãÉÏ͸ß^”µÖµ·½·¨ÌŽÀí•r£¬Fermi level & VBM ²»•þÍêÈ«ÏàµÈ£¬•þÓÐ΢С²î„e
   ß@²î„e»ù±¾ÉÏ¿ÉÒÔ͸ß^ SIGMA È¥Õ{Õû
   ËùÒÔ
   ÓÃÄÄÒ»‚€·½·¨¶¼›]†–î}£¬Ö»ÒªêUÊöÇå³þ¼´¿É

9. E(formation energy) vs Fermi levelÕâ¸öͼµÄºáÖáºÍ×ÝÖáÔõôÀí½â
> ¿vÝS¾ÍÊÇ Formation energy£¬ß@‘ªÔ“²»ÓýâáŒ
   ÄãÉÏÃ憖ß@üN¶à†–î}£¬ÎÒÏë~Ä㌦ defect formation energy ‘ªÔ“ÊÇÓÐÒ»¶¨³Ì¶ÈÁ˽â
   ¶ø x ÝSµÄ Fermi level
   ¾ÍÊÇ defect formation energy ¹«Ê½ƒÈµÄÄÇ‚€ Fermi energy term
   ß@‚€”µ×ÖÊÇ׃”µ£¬ÊÖ„ÓÈ¥¸Ä׃ Fermi level£¬µÃ³öµÄ defect formation energy ¾Í•þ²»Ò»˜Ó

10. Band edge (±ÈÈçCBM)µ½£¨q/q+1£©µÄÄÜÁ¿²î¾ÍÊǶÔÓ¦µÄ·øÉä·¢¹âµÄ²¨³¤Ã´£¿ºÃÏñÓÐÈËÌÖÂÛ˵(q/q+1)µÄtransition levelÊÇthermodynamic transition level£¬¸úoptical transition levelÊDz»Í¬µÄ¡£µ«ÊÇÒÀÈ»¿´µ½ÓкܶàÈËÖ»ÊÇËãÁË£¨q/q+1£©µÄλÖÃÈ»ºó¾Í¿ªÊ¼ÌÖÂÛ·øÉä·¢¹âÁË£¬ÊÇ·ñºÏÀí£¿
> transition level ÊÇ thermodynamic or optical
   ‘ªÔ“ÊÇÒªÖøÖØÔÚ£¬ÊÇ·ñÓп¼‘] phonon

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   ¾ÍËãÄã ...

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Q2: Äã¾õµÃbulk point defect»á²úÉúËùνµÄdipoleô£¿
>>  Physically, ®”È»£¬point defect in bulk ÊÇ•þ®aÉú dipole
       Ö»ÊÇ£¬¾ÍÎÒµÄÀí½â£¬VASP dipole correction ËƺõÊDz»ÄÜ‘ªÓÃÔÚ bulk case
       http://cms.mpi.univie.ac.at/vasp/guide/node143.html


Q3:ÎÒµÄÒâ˼ÊÇ£¬¶ÔÓÚbulk defect£¬´æÔÚ¡°È±ÏÝ´øµç£¨positive/negative£©µÄ¸ÅÄ´Ó¶ø¿ÉÒÔÌÖÂÛÐγÉÄÜvs·ÑÃ×Äܼ¶µÄ¹Øϵ¡±£¬ËùÒÔÕâЩÊÇ·ñ¿ÉÒÔÓÃÓÚ±íÃæ¡¢½çÃæÌåϵµÄÌÖÂÛÄØ£¬´Ó¶ø¿´ÔÚ°ëµ¼Ìå±íÃæ¡¢½çÃæÌåϵÖеÄȱÏÝÐγÉÄÜ£¬ÒÔ¼°È±ÏݵÄdonor/acceptor behaviour£¿
>> bulk defect µÄÄÇÒ»Ì׸ÅÄÊÇ¿ÉÒÔÌ×ÓÃÔÚ ±íÃæ»ò½çÃ棬ß@ÊÇ›]†–î}µÄ
      Ö»ÊÇ£¬ÔÚ±íÃæϵ½y»òÊÇ 2D ϵ½y£¬charged ß@»ØÊ®aÉúµÄ†–î}£¬±È bulk phase ߀?íµÄÂ韩
      ¿ÉÒÔÈ¥¿´Ò»Ï Kaxiras ´óÉñ 2017 µÄ PRB  [PRB 95, 235310, (2017)]


Q7: ÔÚ·¢Ìûºó£¬×Ô¼º¶ÁÎÄÕ£¬µÄÈ·ÊÇÁ˽⵽ÁË~Prof. Van de WalleÀÏʦÖ÷ÒªÍƼöÓá°Ô¶ÀëȱÏÝλÖõÄƽ¾ù¾²µçÊÆÖ®²î¡±£¬ÎÒµÄÒÉÎÊÊÇ£¬ÊDzÉÓÃplane average (Ëã³öÀ´µÄLOCPOT£¬ÓÃvtotav.x´¦ÀíºóµÃµ½potential vs zµÄÇúÏߣ©potential Ö®²î£¬»¹ÊÇÓÃmacroscopic average potential £¨Ã²ËÆÊǶÔvtotav.x´¦Àí¹ýµÄLOCPOTºóµÄÊä³öÎļþÔÙÇóÒ»´Îƽ¾ù£©Ö®²î£¿
>> Ç°Õß
      ²»ß^£¬ÕfŒ?Ô’£¬ÎÒ¿´²»Ì«¶®Ä㌑µÄÇ°ÕßÅcááÕߣ¬ƒÉ·N·½Ê½µÄ²î„eÔÚÄÄÑe ....ºÇ


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DOSËãµÄgap stateȱÏÝÄܼ¶ÊÇÔÚ°ëµ¼ÌåÄÚʵʵÔÚÔÚµÄÄܼ¶£¬ÔÚÄÜ´øͼÖÐÓÐʵÔڵĶÔÓ¦¡£·ÑÃ×Äܼ¶¶¨Á˺ó£¬Ëü´¦ÓÚ±»µç×ÓÌîÂú»òÕß¿Õ̬¡£
CTL£¬È±ÏÝתÒÆÄܼ¶£¨or ȱÏÝԾǨÄܼ¶£¿Äĸö·­Òë¸ü¼ÓºÏÊÊ£¿£©ÊÇÌÖÂÛȱÏݵIJ»Í¬´øµçÇé¿öϵÄÎïÀí¸ÅÄÊDz»Í¬¼Û̬֮¼äÓÐÏàͬȱÏÝÐγÉÄÜʱºò¶ÔÓ¦µÄµç×Ó·ÑÃ×Äܼ¶µÄÄÜÁ¿£¬Ò²¾ÍÊǵçÀëÄÜ£¬¼´µç×ÓÌî³äµ½Õâ¸ö·ÑÃ×Äܼ¶Ê±ºòÕâ¸öȱÏݵļÛ̬·¢ÉúÁ˸ı䣻ÒòΪȱÏݵļÛ̬·¢ÉúÁ˸ı䣬ËùÒÔËü²ÎÓëµç×ÓԾǨÒÔ¼°µç×Ó/¿ÕѨ¸´ºÏ¹ý³Ì¡£
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>> ¾CºÏ»Ø‘ªÒ»Ï£¬ÒÔÏÂÊÇß@Ž×Äê×ö point defect µÄ½›òžÅcÐĵ÷ÖÏí£¬‘ªÔ“¿ÉÒԻشðµ½ÄãÉÏÃæµÄÒÉ»ó
      ÈôÓÐʲüNµØ·½²»ÊÇÕý´_µÄ£¬ÕˆÖ±½Óüc³ö›]êP‚S
1. DFT Ó‹Ëã³ö?íµÄÄÜëA(state)£¬Ò²¾ÍÊÇŒ¦‘ªµ½DOSƒÈµÄ state£¬Êǽ¨˜‹ÔÚ Kohn-Sham theorm Ï£¬
    ÊÇŒ¦‘ªµ½Ä³‚€Ìض¨µÄ î‘B(ground state or excited state)µÄ "ß@‚€Ë²ég" µÄëŠ×Ó½Y˜‹
2. ËùÒÔ£¬±È·½Äã×öij‚€ point defect µÄ ground state£¬Æä filled state ÔÚ VBM+1.0 eV λÖÃÉÏ£¬empty state ÔÚ VBM+2.0 eV λÖÃÉÏ
    ƒÉÕßégÄÜÁ¿²î 1.0 eV£¬²»´ú±í®” filled state ëŠ×ÓÜSßwµ½ empty state íšÒª 1.0 eV
3. †Î¼ƒµÄ DFT Ó‹Ë㣬²»•þ¿¼‘]µ½ electron-hole interaction£¬±ØíšÒª×ö Berry phase Ó‹Ëã²ÅÐÐ
4. CTL ×÷ˆD•r£¬x-axis ÊÇ Fermi level£¬y-axis ÊÇ formation energy
    DOS ×÷ˆD•r£¬x-axis ÊÇ eigenvalue (energy)£¬y-axis ÊÇ number of state (state intensity)
    ƒÉÕß........... ÊDz»Í¬µÄ–|Î÷
    (CTL µÄ energy ÊÇ Fermi energy£¬DOS µÄ energy ÊÇ eigenvalue energy)
7Â¥2018-03-29 13:05:12
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zhangfrank

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7Â¥: Originally posted by jpchou at 2018-03-29 13:05:12
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>> ÖxÖx ^__^

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Prof. Van de WalleÀÏʦÖ÷ÒªÍƼöÓá°Ô¶ÀëȱÏÝλÖõÄƽ¾ù¾²µçÊÆÖ®²î¡±£¬ÎÒµÄÒÉÎÊÊÇ£¬ÊDzÉÓÃplane average potential  (Ëã³öÀ´µÄLOCPOT£¬ÓÃvtotav.x´¦ÀíºóµÃµ½potential vs zµÄÇúÏߣ¬¼´¸½Í¼ÖкÚÉ«ÐéÏߣ©Ö®²î£¬»¹ÊÇÓÃmacroscopic average potential £¨¸½Í¼ÖеÄÀ¶É«ÊµÏߣ©Ö®²î£¿
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Q7¼ÌÐø²¹³ä£ºÎҴӹȸèͼƬËæ»úÕÒÁËÒ»¸öaverage potentialµÄͼƬPlanar-averaged-electrostatic-potential-dashed-line-and-its-macroscopic-average-solid
Prof. Van de WalleÀÏʦÖ÷ ...

Q7¼ÌÐø²¹³ä£ºÎҴӹȸèͼƬËæ»úÕÒÁËÒ»¸öaverage potentialµÄͼƬPlanar-averaged-electrostatic-potential-dashed-line-and-its-macroscopic-average-solid
Prof. Van de WalleÀÏʦÖ÷ÒªÍƼöÓá°Ô¶ÀëȱÏÝλÖõÄƽ¾ù¾²µçÊÆÖ®²î¡±£¬ÎÒµÄÒÉÎÊÊÇ£¬ÊDzÉÓÃplane average potential  (Ëã³öÀ´µÄLOCPOT£¬ÓÃvtotav.x´¦ÀíºóµÃµ½potential vs zµÄÇúÏߣ¬¼´¸½Í¼ÖкÚÉ«ÐéÏߣ©Ö®²î£¬»¹ÊÇÓÃmacroscopic average potential £¨¸½Í¼ÖеÄÀ¶É«ÊµÏߣ©Ö®²î£¿
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>> see£¬¡°Ô¶ÀëȱÏÝλÖõÄƽ¾ù¾²µçÊÆÖ®²î¡± ÆäŒ?Ò²¾ÍÏñÊÇÄãˆDÖÐ vacuum region
      ŸoÕ“ black dashed line or blue line£¬ÔÚ vacuum region£¬Æä potential ÊÇÏàµÈµÄ
      plane average potential£¬Ò²¿ÉÒÔ½Ð×ö microscopic average potential£¬¾ÍÊÇŒ¦Ã¿‚€ z üc×ö xy ƽÃæµÄ potential ƽ¾ù
      ¶ø macroscopic average potential ÊÇŒ¦ microscopic average potential ÔÙßMÒ»²½×ö dz µÄƽ¾ù
      see http://electrons.wikidot.com/dharma


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9Â¥: Originally posted by jpchou at 2018-03-29 22:00:32
Q7¼ÌÐø²¹³ä£ºÎҴӹȸèͼƬËæ»úÕÒÁËÒ»¸öaverage potentialµÄͼƬPlanar-averaged-electrostatic-potential-dashed-line-and-its-macroscopic-average-solid
Prof. Van de WalleÀÏʦÖ÷ÒªÍƼöÓá°Ô¶ÀëȱÏÝλÖõÄƽ¾ù ...

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BTW£¬ÈçºÎ´Ó microscopic average potentialµÃµ½macroscopic average potential ÄúÓÐÏà¹ØµÄ´¦ÀíÊý¾ÝµÄ½Å±¾Ã´£¿

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