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IGPAR = 1 NPPSTR = 8 DIPOL = 0.5 0.5 0.5 £¨×¢ ÊÍ£ºÒª²ÉÓÃBerry phase·½·¨À´¼ÆËãµç×Ó¼«»¯Ê±£¬ÐèÔÚINCARÖÐÉèÖÃLBERRY=.TRUE.£¬ÁíÍâÉèÖÃËùÒª¼ÆËãµÄ·½Ïò¼´ÉèÖÃIGPAR £¨¿É¸³µÄֵΪ1,2,3·Ö±ð±íʾG1, G2ºÍG3·½Ïò), ÑØ×ÅIGPAR·½ÏòÉϵÄÒ»´®kµãµÄ¸öÊý ¼´ÉèÖÃNPPSTR(×¢ÒâµÄÊÇ£¬ÔÚÆ½ºâ̬ʱµÄ¼ÆËãºÍÔ×ÓÒÆ¶¯Ö®ºóµÄ¼ÆËãÖУ¬ËüÖµÓ¦¸ÃÊÇÒ»ÑùµÄ)£¬×îºóÉèÖÃÔÚ¼ÆËãÀë×ÓµÄdipoleʱµÄ²Î¿¼µã¼´ÉèÖà DIPOL£¨×¢ÒâµÄÊÇ£¬ËüµÄÉèÖÃÐèҪʹµÃÔ×ÓÒÆ¶¯Ç°ºóµÄÔ×Ó¶¼ÔÚÕâ¸ö²Î¿¼µãµÄÒ»²à¡£±ÈÈçÕâ¸öÀý×ÓÖÐ Al´¦ÓÚ(0,0,0)£¬As´¦ÓÚ(0.25, 0.25, 0.25)λÖ㬶ø½«DIPOLÉèÖÃΪ(0.5, 0.5, 0.5)ºÍ(0.125, 0.125, 0.125)¶¼ÊÇ¿ÉÒԵ쬵«ÊÇÔÚ¿¼ÂÇÒÆ¶¯AlÔ×Óʱ£¬²»Òª½«Ô×ÓÒÆ¶¯Ô°ûÖ®Íâ¼´Æ«ÒÆÁ¿Îª¸ºÊý£»ÁíÍâÒ²²»Òª½«DIPOLÉèÖÃÔÚËùÒªÒÆ¶¯µÄÔ×ÓÉÏ£¬Èç¹ûÊÇÕâÑùµÄ»°£¬Ôò»áµ¼ÖÂÒÆ¶¯¸ÃÔ×Ӻ󣬸ÃÔ×Ó²»ÔÚDIPOLµÄͬһ²à£¬Ê¹µÃÔ×ÓÒÆ¶¯Ö®ºóµÄ¼«»¯µÄBerry-phaseÏîÒª±Èƽºâ̬ʱµÄ´óºÜ¶à¡££© POSCARºÍKPOINTSͬi)Öеġ£ ½«µÚi)¼ÆËãµÃµ½µÄCHGCAR, CHG, WAVECAR¿½±´¹ýÀ´£¬½øÐмÆËã¡£ ¼ÆËãÍêºó±£´æOUTCAR£¬´ÓOUTCARÎļþÖÐÕÒ³ö¼«»¯µÄ¸÷¸öÏîµÄ¹±Ï×£¬¿ÉÒÔ²ÉÓÃÏÂÃæµÄÃüÁ grep '' OUTCAR ÈçÏÂÃæµÄÊý¾Ý Expectation value term: ¡¶R¡·ev ¡¶R¡· = ( -0.00022, -0.00117, 0.00074 ) electrons Angst Berry-Phase term: ¡¶R¡·bp ¡¶R¡· = ( 0.00000, -0.00455, -0.00455 ) electrons Angst ionic term: ¡¶R¡·ion ¡¶R¡· = ( 15.32363, 15.32363, 15.32363 ) electrons Angst (×¢ÊÍ£ººóÃæµÄÈýÁÐÊý¾Ý·Ö±ð±íʾµÄÊÇx, y, z·½ÏòµÄ¡£) iii)ºÍiv)²½Í¬ii)ÀàËÆ£¬Ö»ÊÇ·Ö±ð½«IGPAR = 1¸ÄΪIGPAR = 2ºÍIGPAR = 3¡£ ÏÂÃæÊǼÆËãG2·½Ïòʱ(¼´IGPAR=2)µÃµ½µÄÊý¾Ý: Expectation value term: ¡¶R¡·ev ¡¶R¡· = ( -0.00117, -0.00022, 0.00074 ) electrons Angst Berry-Phase term: ¡¶R¡·bp ¡¶R¡· = ( -0.00455, 0.00000, -0.00455 ) electrons Angst ionic term: ¡¶R¡·ion ¡¶R¡· = ( 15.32363, 15.32363, 15.32363 ) electrons Angst ÏÂÃæÊǼÆËãG3·½Ïòʱ(¼´IGPAR=3)µÃµ½µÄÊý¾Ý£º Expectation value term: ¡¶R¡·ev ¡¶R¡· = ( -0.00117, 0.00074, -0.00022 ) electrons Angst Berry-Phase term: ¡¶R¡·bp ¡¶R¡· = ( -0.00455, -0.00455, 0.00000 ) electrons Angst ionic term: ¡¶R¡·ion ¡¶R¡· = ( 15.32363, 15.32363, 15.32363 ) electrons Angst ÏÂÃæ°´¹«Ê½¼ÆËã¼ÆÆ½ºâ̬ʱ¡¶R¡·evÔÚG1¡¢G2ºÍG3·½ÏòÉÏµÄÆ½¾ùÖµ£º ¡¶R¡· ev, undistorted, average = [( -0.00022, -0.00117, 0.00074 )+ ( -0.00117, -0.00022, 0.00074 )+ ( -0.00117, 0.00074, -0.00022 ) ]/3.0 = ( -0.00022-0.00117-0.00117, -0.00117-0.00022+0.00074, 0.00074+0.00074-0.00022 ) /3.0 =(-0.000853333, -0.000216667, 0.00042) °Ñƽºâ̬ʱ¸÷¸ö·½Ïò¼ÆËãʱµÃµ½¡¶R¡·bpÏîÇóºÍ£º ¡¶R¡·bp, undistorted, all = ( 0.00000, -0.00455, -0.00455 ) + ( -0.00455, 0.00000, -0.00455 ) + ( -0.00455, -0.00455, 0.00000 ) = ( -0.00455*2, -0.00455*2, -0.00455*2 ) = ( -0.0091, -0.0091, -0.0091) ÄÇôƽºâ̬ʱµç×Ó¼«»¯Ïî ¡¶R¡·el, undistorted¾ÍÊÇ: ¡¶R¡· el, undistorted =¡¶R¡· ev, undistorted, average + ¡¶R¡·bp, undistorted, all =(-0.000853333, -0.000216667, 0.00042) +( -0.0091, -0.0091, -0.0091) =(-0.000853333 -0.0091, -0.000216667 -0.0091, 0.00042 -0.0091) =(-0.00995333, -0.00931667, -0.00868) ƽºâ̬ʱÀë×Ó¼«»¯Ïî¡¶R¡·ion, undistorted£¬ÔÚÈÎÒâÒ»¸ö·½Ïò¼ÆËãʱµÃµ½µÄÊý¾Ý£¬¼´£º ¡¶R¡·ion, undistorted = ( 15.32363, 15.32363, 15.32363 ) 2. ¼ÆËãAlÔ×ÓÆ«ÀëÆ½ºâλÖÃʱµÄ¼«»¯£º i)ÆäÖеÄINCAR£¬ KPOINTSͬµÚ1 i)²½Öеģ¬Ö»Êǽ«POSCARÖÐ AsÔ×ÓµÄλÖÃÑØ×Åij¸ö·½ÏòÂÔÒÆ¶¯Ò»¸öСÁ¿£¬ÈçÏ£º POSCAR AlAs 5.57223 0.0 0.5 0.5 0.5 0.0 0.5 0.5 0.5 0.0 1 1 Direct 0.000 0.0000 0.0000 0.250 0.2500 0.2300 £¨×¢ÊÍ£ºÕâÖÖÉèÖÃÊǵ¼ÖÂAsÔÚxºÍy·½ÏòÉ϶¼Òƶ¯ÁË0.05572 angstrom£¬Õâ¸ö¿ÉÒÔ×Ô¼ºËã³öÀ´£¬»òÕßÖ±½Ó´ÓÒÆ¶¯Ç°ºóÁ½´Î¼ÆËãµÄOUTCARÖеÄÔ×Ócartesian×ø±ê½øÐмòµ¥µÄ¼Ó¼õ¼ÆËãÖ®ºóµÃµ½¡£) È»ºó×÷×ÔÇ¡¼ÆË㣬¼ÆËãÖ®ºó±£´æµÃµ½CHGCAR, CHG, WAVECAR¡£ ii)¡¢¼ÆËãÔ×ÓÒÆ¶¯Ö®ºó£¬ÌåÏµÑØ×ÅG1·½ÏòµÄ¼«»¯£º INCARºÍKPOINTSµÄÊäÈëÎļþͬµÚ1 ii)²½Öе쬽«ÉÏÒ»²½±£´æÏÂÀ´µÄCHG, CHCARºÍWAVECAR¿½±´¹ýÀ´£¬È»ºó¼ÆËãµÃµ½OUTCAR£¬ÔÚ±£´æºó£¬´ÓÖпÉÒÔÕÒµ½Ïà¹ØµÄ¼«»¯¼ÆËãÊý¾Ý£¬Í¨¹ýÏÂÃæµÄÃüÁîÀ´²éÕÒ£º grep '' OUTCAR ´ËÀý×ӵļÆËãÊý¾Ý£º Expectation value term: ¡¶R¡·ev ¡¶R¡· = ( -0.00091, -0.00100, -0.00030 ) electrons Angst Berry-Phase term: ¡¶R¡·bp ¡¶R¡· = ( 0.00000, -0.00475, -0.00475 ) electrons Angst ionic term: ¡¶R¡·ion ¡¶R¡·= ( 15.60224, 15.60224, 15.32363 ) electrons Angst iii)& iv).¼ÆËãÔ×ÓÒÆ¶¯ºóÌåÏµÑØ×ÅG2ºÍG3·½ÏòµÄ¼«»¯£º INCARºÍKPOINTSÖеķֱðÓëµÚ1 iii)&iv)²½ÖеÄÒ»Ñù¡£ ´ËÀý×Ó¼ÆËãµÃµ½µÄÊý¾Ý: ÑØ×ÅG2·½ÏòµÄ£º Expectation value term: ¡¶R¡·ev ¡¶R¡· = ( -0.00100, -0.00091, -0.00030 ) electrons Angst Berry-Phase term: ¡¶R¡·bp ¡¶R¡·= ( -0.00475, 0.00000, -0.00475 ) electrons Angst ionic term: ¡¶R¡·ion ¡¶R¡· = ( 15.60224, 15.60224, 15.32363 ) electrons Angst ÑØ×ÅG3·½ÏòµÄ£º Expectation value term: ¡¶R¡·ev ¡¶R¡· = ( -0.00233, 0.00032, -0.00029 ) electrons Angst Berry-Phase term: ¡¶R¡·bp ¡¶R¡· = ( -0.40026, -0.40026, 0.00000 ) electrons Angst ionic term: ¡¶R¡·ion ¡¶R¡· = ( 15.60224, 15.60224, 15.32363 ) electrons Angst ͬÑù°´¹«Ê½¼ÆËã³öÔ×ÓÒÆ¶¯Ö®ºóµÄ¼«»¯£º ½«G1, G2, G3¸÷¸ö·½Ïò¼ÆËãµÃµ½¡¶R¡·evÏî½øÐÐÆ½¾ù£º ¡¶R¡·ev, distorted, average = [ ( -0.00091, -0.00100, -0.00030 ) + ( -0.00100, -0.00091, -0.00030 ) + ( -0.00233, 0.00032, -0.00029 )]/3.0 = ( -0.00091-0.00100-0.00233, -0.00100-0.00091+0.00032, -0.00030-0.00030--0.00029)/3.0 =(-0.00141333, -0.00053, -0.000103333) ½«G1, G2, G3¸÷¸ö·½Ïò¼ÆËãʱµÃµ½¡¶R¡·bpÏîÇóºÍ£º ¡¶R¡·bp, distorted, all = ( 0.00000, -0.00475, -0.00475 )+ ( -0.00475, 0.00000, -0.00475 )+ ( -0.40026, -0.40026, 0.00000 ) =(0.00000-0.00475-0.40026, -0.00475+0.00000-0.40026, -0.00475 -0.00475+0.00000) =(-0.40501, -0.40501, -0.0095) Óɴ˵õ½Ô×ÓÒÆ¶¯Ö®ºóµç×Ó¼«»¯Ïî ¡¶R¡·el, distorted: ¡¶R¡·el, distorted= ¡¶R¡·ev, distorted, average + ¡¶R¡·bp, distorted, all =(-0.00141333, -0.00053, -0.000103333)+(-0.40501, -0.40501, -0.0095) =(-0.00141333-0.40501, -0.00053-0.40501, -0.000103333-0.0095) =(-0.406423, -0.40554, -0.00960333) Ô×ÓÒÆ¶¯ºóÀë×Ó¼«»¯Ïî¡¶R¡·ion, distortedÈ¡ÈÎÒâÒ»¸ö·½ÏòÉϼÆËãµÃµ½µÄÊý¾Ý¡¶R¡·ion: ¡¶R¡·ion, distorted = ( 15.60224, 15.60224, 15.32363 ) Óɴ˵õ½ÓÉÓÚAsÔ×ÓµÄÒÆ¶¯ÒýÆðµÄ¼«»¯±ä»¯Îª£º Delta ¡¶R¡·= ¡¶R¡·ion, distorted + ¡¶R¡·el, distorted - ¡¶R¡·ion, undistorted - ¡¶R¡·el, undistorted = ( 15.60224, 15.60224, 15.32363 )+(-0.406423, -0.40554, -0.00960333) - ( 15.32363, 15.32363, 15.32363 )-(-0.00995333, -0.00931667, -0.00868) =( 15.60224-0.406423-15.32363+0.00995333, 15.60224-0.40554-15.32363+0.00931667, 15.32363-0.00960333-15.32363+0.00868) =(-0.11786, -0.117613, -0.00092333) ÔÚÇ°ÃæÒѾÌáµ½ÁËÕâ¸öÊÇÔÚAs·Ö±ðÔÚÑØ×Åx, y·½ÏòÉÏÒÆ¶¯ÁË0.05572 angstromʱµÄ¼ÆËã½á¹û¡£ÄÇôÓɴ˿ɼÆËã³öAsÔ×ÓµÄÑØ×Åx,y·½ÏòÉϵÄBornÓÐЧµçºÉ£¨Êµ¼ÊÉÏÓÉÓÚAlAsÊÇÁ¢·½¾§Ì壬AsÔ×ÓµÄBornÓÐЧµçºÉÑØ×Åxx, yy, zz·½ÏòµÄ¶¼ÏàµÈ£¬xz, yz, xy·½ÏòÉϵĶ¼Îª0£©°´²î·Ö¹«Ê½¿ÉÒÔ¼ÆËãµÃµ½£º Z*_As = Delta¡¶R¡·/ Delta x_As =-0.11786/0.05572 =-2.11522 ÓÉÓÚÔ°ûËùÓÐÔ×ÓµÄBornÓÐЧµçºÉ¸÷¸ö·½ÏòµÄ¼ÓÆðÀ´ÒªÂú×ãµçºÉÖÐÐÔµÄÌõ¼þ£¬AlAsÖÐÖ»ÓÐAlºÍAsÁ½Àà(Ò²Ö»ÓÐ2¸öÔ×Ó)Ô×Ó£¬Òò´ËÒ²¿ÉÒԵõ½AlµÄBornÓÐЧµçºÉΪ2.11522£¬ÕâÓëABINITÖеĽ̳ÌÖмÆËãµÄÊý¾ÝºÜ½Ó½ü¡£ ʵ¼ÊÉÏÃæÁ½´ó²½µÄ4¸öС²½Ö裬¿É²ÉÏÂÃæµÄ½Å±¾À´Á¬Ðø¼ÆËãÍê³É¡£ ҪעÒâµÄ¾ÍÊÇDIPOL µÄÉèÖã¬ÒÔ¼°Ô×ÓÒÆ¶¯µÄѡȡ£º²»Òª½«DIPOLÉèÖÃÔÚij¸öÔ×ÓλÖÃÉÏ£¬Ô×ÓÒÆ¶¯µÄѡȡҪ±£Ö¤Ô×ÓÔÚÒÆ¶¯Ç°ºó¶¼ÊÇDIPOLµÄͬһ²à¡£ |
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