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wuli8ÈÙÓþ°æÖ÷ (ÖªÃû×÷¼Ò)
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¡¾ÇóÖú¡¿band structures using hybrid functionals µÄKpointsÎÊÌâ
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http://cms.mpi.univie.ac.at/vasp-forum/forum_viewtopic.php?4.6633.10 band structures using hybrid functionals have to be calculated the following way: -) First perform a selfconsistent Hartree-Fock/HSE calculation using a conventional KPOINTS file. -) Copy the IBZKPT file to KPOINTS, and explicitely add all desired k-points along high-symmetry lines of the BZ that are needed for the bandstructure plot. Add the points at the end of the KPOINTS file, but set the weights of these added k-points to 0. -) Do not forget to set the number of k-points in KPOINTS correctly (to the number of the k-points used in the standard mesh PLUS the number of the k-points along the lines), such that all k-points are used for the calculations. -) NKRED can not be used. -) Perform a second VASP run: It is recommended to use the Davidson algorithm, since it converges that eigen energies at the new k-points fastest. Since VASP terminates when the total energy is converged to a certain threshold, it is important to force VASP to do a minimum number of steps, so that the orbitals at the new k-points are fully converged (note: since their weight is zero, they do not contribute to the total energy). This can be done using e.g. ALGO = N ; NELMIN = 5 ! Davidson, minimum 5 scf-steps IBRION = 1 ! Use simple charge mixer, since Pulay might blow up -) The KS-eigenvalues of the states along the high-symmetry lines are written in OUTCAR, EIGENVAL, vasprun.xml; please cut the k-points required for the bandstructure from one of these files and proceed as usual (using p4vasp or any other graphics tool you usually use to produce bandstructure-plots) Note: A Hartee-Fock calculation can NOT be continued from an existing CHGCAR file, since the non-local exchange is not determined by the charge density but by the density matrix and/or the KS-orbitals. ÒÔÉÏÊǹٷ½¸ø³öµÄ½âÊÍ¡£ ÎÒµÄÎÊÌâÊÇ£º 1¡¢-) Copy the IBZKPT file to KPOINTS, and explicitely add all desired k-points along high-symmetry lines of the BZ that are needed for the bandstructure plot. Add the points at the end of the KPOINTS file, but set the weights of these added k-points to 0. °´ÕÕÕâÑùµÄ·½·¨²úÉúµÄKpointsÔËÐкóÌáʾKpoints´íÎ󣬲»ÄܶÁÈ¡¡£ 2¡¢ÕâÒ»¾ä²»ÖªËùÔÆ£º(to the number of the k-points used in the standard mesh PLUS the number of the k-points along the lines), ûÓÐÀí½âÔõô»ØÊ£¿ ÇëÎÊËÓÃhseµÄ·½·¨¼ÆËã¹ýÄÜ´ø½á¹¹£¬ÇëshowÒ»ÏÂÏÂÄãµÄKpoints¡£ лл¡£ [ Last edited by wuli8 on 2010-12-1 at 21:04 ] |
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һ¥µÄÄǸö¹Ù·½»Ø¸´ÎÒÓÐÁ½µã²»Ì«Ã÷°×¡£ 1£©explicitely add all desired k-points along high-symmetry lines of the BZ that are needed for the bandstructure plot. Add the points at the end of the KPOINTS file, Õâ¸öÊÇ˵°ÑÎÒÃÇÏëÒª¼ÆËãµÄÑØ¸ß¶Ô³Æ·½ÏòµÄKµã×Ô¼º¼Óµ½KPOINTSµÄĩβ²¿·Ö£¬ÎÊÌâÊÇ×Ô¼º¼ÆËãÕâЩKµãµÄ×ø±êÊÇÒ»¼þºÜÂé·³µÄÊÂÇ飬ÏñÊÇÓеãÄÜ´ø¼ÆËã¿ÉÄÜÐèÒª¼ÆËã°Ë¾ÅÊ®¸öKµã£¬ÕâÒªÊÇ×Ô¼ºÒ»¸öÒ»¸öËã×ø±ê£¬ÄǿɷѾ¢ÁË¡£ÎÒÃÇÖ®ËùÒÔÔÚVASP5.2֮ǰµÄ°æ±¾ÖÐʹÓõÄKPOINTSÎļþÖÐʹÓÃLine-modeģʽ£¬¾ÍÊÇÒòΪvasp¿ÉÒÔ¸ù¾ÝÎÒÃǸø³öµÄ¸ß¶Ô³Æµã£¬×ÔÐÐËã³öÕâЩKµãµÄ×ø±ê¡£ ËùÒÔ²»ÖªµÀÄÄλÅóÓÑÖªµÀÓÐûÓбȽϼòµ¥µÄ·½·¨¿ÉÒԵóöÑØ¸ß¶Ô³ÆµãµÄKµãµÄ×ø±ê£¿ 2) Perform a second VASP run: ÔÚÕâ¸ö·½·¨ÖÐ×ÔÇ¢Ô¤ËãÐèÒªÔËÐÐÁ½±é£¬ÄÇÎÒÏëÖªµÀµÚÒ»±é×ÔÇ¢ÔËËãµÄ×÷ÓÃÊÇʲô£¿ÎÒµÄÏë·¨ÊÇ£ºÈç¹ûÎÒµÄKPOINTSÎļþÊÂÏȾͰ´ÕÕËûÉÏÃæËù˵µÄ³ÌÐò¶¼ÉèÖúÃÁË£¨¼´Copy the IBZKPT file to KPOINTS, and explicitely add all desired k-points along high-symmetry lines of the BZ that are needed for the bandstructure plot. Add the points at the end of the KPOINTS file, but set the weights of these added k-points to 0. £©£¬ÄÇÎÒÊDz»ÊÇÖ±½ÓÔËÐÐÒ»±é×ÔÇ¢ÔËËã¾Í¿ÉÒԵóö½á¹û£¬²»ÐèÒªÏñһ¥Ëù˵µÄÄÇÑù½øÐÐÁ½±éÔËË㣬ÒòΪ±Ï¾¹Õâ¸öÔËËãÊÇÏ൱ºÄʱ¼äµÄ¡£ ÓÐÄÄλ¸ßÈË¿ÉÒÔÖ¸µãһϣ¿ |
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zzy870720z(½ð±Ò+2):ллָ½Ì 2010-12-04 21:36:29
wuli8(½ð±Ò+100):¸Ðл¡£ÎÒÔÙÊÔÒ»ÊÔ 2010-12-04 22:51:40
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Automatically generated mesh 57 Reciprocal lattice 0.000000 0.000000 0.000000 1.000000 0.333333 0.000000 0.000000 1.000000 -0.333333 0.000000 0.000000 1.000000 0.000000 0.333333 0.000000 1.000000 0.333333 0.333333 0.000000 1.000000 -0.333333 0.333333 0.000000 1.000000 0.000000 -0.333333 0.000000 1.000000 0.333333 -0.333333 0.000000 1.000000 -0.333333 -0.333333 0.000000 1.000000 0.000000 0.000000 0.333333 1.000000 0.333333 0.000000 0.333333 1.000000 -0.333333 0.000000 0.333333 1.000000 0.000000 0.333333 0.333333 1.000000 0.333333 0.333333 0.333333 1.000000 -0.333333 0.333333 0.333333 1.000000 0.000000 -0.333333 0.333333 1.000000 0.333333 -0.333333 0.333333 1.000000 -0.333333 -0.333333 0.333333 1.000000 0.000000 0.000000 -0.333333 1.000000 0.333333 0.000000 -0.333333 1.000000 -0.333333 0.000000 -0.333333 1.000000 0.000000 0.333333 -0.333333 1.000000 0.333333 0.333333 -0.333333 1.000000 -0.333333 0.333333 -0.333333 1.000000 0.000000 -0.333333 -0.333333 1.000000 0.333333 -0.333333 -0.333333 1.000000 -0.333333 -0.333333 -0.333333 1.000000 0.00000000 0.00000000 0.50000000 0 0.00000000 0.00000000 0.44444444 0 0.00000000 0.00000000 0.38888889 0 0.00000000 0.00000000 0.33333333 0 0.00000000 0.00000000 0.27777778 0 0.00000000 0.00000000 0.22222222 0 0.00000000 0.00000000 0.16666667 0 0.00000000 0.00000000 0.11111111 0 0.00000000 0.00000000 0.05555556 0 0.00000000 0.00000000 0.00000000 0 0.00000000 0.00000000 0.00000000 0 0.05555556 0.05555556 0.00000000 0 0.11111111 0.11111111 0.00000000 0 0.16666667 0.16666667 0.00000000 0 0.22222222 0.22222222 0.00000000 0 0.27777778 0.27777778 0.00000000 0 0.33333333 0.33333333 0.00000000 0 0.38888889 0.38888889 0.00000000 0 0.44444444 0.44444444 0.00000000 0 0.50000000 0.50000000 0.00000000 0 0.50000000 0.50000000 0.00000000 0 0.50000000 0.50000000 0.05555556 0 0.50000000 0.50000000 0.11111111 0 0.50000000 0.50000000 0.16666667 0 0.50000000 0.50000000 0.22222222 0 0.50000000 0.50000000 0.27777778 0 0.50000000 0.50000000 0.33333333 0 0.50000000 0.50000000 0.38888889 0 0.50000000 0.50000000 0.44444444 0 0.50000000 0.50000000 0.50000000 0 Àý×Ó£¬Éϰ벿·ÖÊÇMonkhorst Pack²úÉúµÄKµã£¬ÏÂÃæÊǸ߶ԳƵÄKµã£¬µÚ¶þÐÐ×ÜKµãµÄÊýÄ¿ÊÇÁ½²¿·ÖµÄ×ܺͣ¬»ÄÜ´øµÄʱºòֻȡÏÂÃæ¸ß¶Ô³Æ²¿·ÖµÄ±¾Õ÷Öµ¼´¿É |
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