<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Hi all<br><br><pre><br>I am trying to use implemented approach GWW in espresso to obtain<br>quasiparticle state for bulk TiO2 ,but I didn,t succeed to get true band<br>gap by GW density of state. <br>I used 10 10 12 kmesh for k sampling but I don't know which file and which<br>rows contains dielectric constant. when I grep E_HEAD ,the last lines is<br>E_HEAD : 58 (-0.288322417972075195E-19,-0.347622164532722579E-06)<br> E_HEAD : 59 (0.136048521030191330E-19,-0.268035068560476896E-06)<br> E_HEAD : 60 (-0.562749703002366818E-20,-0.199037475630983443E-06)<br> E_HEAD : 61 (-0.246456835447587453E-19,-0.139320684851361126E-06)<br> E_HEAD : 62 (-0.140385361912330342E-20,-0.874710056217020343E-07)<br> E_HEAD : 63 (-0.136889611087276274E-19,-0.425462567302966249E-07)<br> E_HEAD : 64 (0.768141330640736074E-21,-0.345502880250938209E-08)<br> E_HEAD : 65
(0.107544342599385735E-20,0.304924298030858145E-07)<br> E_HEAD : 66 (-0.671894800358640115E-21,0.599998026878208404E-07)<br> E_HEAD : 67 (-0.375064376440559633E-20,0.856803318704701437E-07)<br> E_HEAD : 68 (0.129039143800604427E-20,0.107981120709046864E-06)<br> E_HEAD : 69 (-0.152241559615558039E-19,0.127297350596598846E-06)<br> E_HEAD : 70 (-0.244342562407378874E-20,0.144032713772979207E-06)<br> E_HEAD : 71 (0.198849485733610600E-19,0.158423408825083901E-06)<br> E_HEAD : 72 (0.219404232386768220E-20,0.170765538857496266E-06)<br> E_HEAD : 73 (0.813380241001557854E-20,0.181265846697849958E-06)<br> E_HEAD : 74 (-0.509064059105312810E-20,0.190124058103262224E-06)<br> E_HEAD : 75 (-0.107771697951803568E-19,0.197507480698692005E-06)<br> E_HEAD : 76 (-0.755628381457475164E-20,0.203488676149189520E-06)<br> E_HEAD : 77 (0.371877756929380836E-21,0.208211859121554605E-06)<br> E_HEAD : 78 (-0.250163334688176281E-19,0.211741944281895265E-06)<br> E_HEAD : 79
(-0.450176577358151232E-20,0.214163773837653336E-06)<br> E_HEAD : 80 (0.111342594432056654E-20,0.215490995789092124E-06)<br><br><br>what is these two columns? where do I look for dielectric constant?<br>also when I grep the energy in exchange file I see<br>X energy 1 -3.13056306094735648<br> X energy 2 -3.13125888267243768<br> X energy 3 -2.56505488760584210<br> X energy 4 -2.56505496437444780<br> X energy 5 -2.56683481217169884<br> X energy 6 -2.56683439322773843<br> X energy 7 -2.57403536452406989<br> X energy 8 -2.57295775811234151<br> X energy 9 -2.29952361470927169<br> X energy 10 -2.36757500687829703<br> X energy 11 -2.37632661585543126<br> X energy 12 -2.37632650375416299<br> X energy 13 -1.72370046221945539<br> X energy 14 -1.77636454255141807<br> X energy 15 -1.60170507625502379<br> X energy 16 -1.81076344235177400<br> X energy 17 -1.81076344671808909<br> X energy 18 -1.76589211249002198<br> X energy 19 -1.76589206392332332<br> X energy 20
-1.82208492695257473<br> X energy 21 -1.85042251355195186<br> X energy 22 -1.82815140295191192<br> X energy 23 -1.82815105271344058<br> X energy 24 -1.82718632043692120<br> X energy 25 -0.890395593964818821<br> X energy 26 -0.887974129642995047<br> X energy 27 -0.900839858974197383<br> X energy 28 -0.902277881230984180<br> X energy 29 -0.902276970932468392<br> X energy 30 -1.04934158998102989<br> X energy 31 -0.962865050316516147<br> X energy 32 -1.11061163384487793<br> X energy 33 -1.11061206732082796<br> X energy 34 -1.06420854530274700<br> X energy 35 -0.523436808399921905<br> X energy 36 -0.406604087930116875<br> X energy 37 -0.406604162637408506<br> X energy 38 -0.453038499132750461<br> X energy 39 -0.368261805733013314<br> X energy 40 -0.350145281021921162<br> X energy 41 -0.575993591072415878<br> X energy 42 -0.419593201827778928<br> X energy 43 -0.419593052276878598<br> X energy 44 -0.234200550211784625<br> X energy 45 -0.391296377238919968<br>
X energy 46 -0.320118869687510410<br> X energy 47 -0.274223229681573089<br> X energy 48 -0.274223174645249645<br> X energy 49 -0.203773634312640867<br> X energy 50 -0.201021532629956590<br>and it seems to be converged.<br><br><br><br>so what is the problem that I get very wide gap(about 10 eV)?<br>I attach my script for this material. Please say how can I do that?<br>thanks a lot<br></pre><br><br>Ali Kazempour<br>
Physics department, Isfahan University of Technology<br>
84156 Isfahan, Iran. Tel-1: +98 311 391 3733<br>
Fax: +98 311 391 2376 Tel-2: +98 311 391 2375</td></tr></table><br>