<div dir="ltr">Dear <span style="font-size:12.8px">Minoru,</span><div><span style="font-size:12.8px">Thanks for quick response. Here AA=angstrom?? I tried esm method in vc-relax calculations with two boundary conditions</span></div><div><span style="font-size:12.8px">1. pbc and 2. bc1.</span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">For pbc conditions the energy comes out too be negative but for bc1 it was positive ( with no esm_w value). Energy of solids is always negative. So where I am wrong?</span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">Thanks.</span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">Rajesh</span></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jul 26, 2017 at 5:32 PM, 大谷実 <span dir="ltr"><<a href="mailto:minoru.otani@aist.go.jp" target="_blank">minoru.otani@aist.go.jp</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear Rajesh,<br>
<br>
I can not fully understand your configuration. But let me suppose you have a single graphene<br>
sheet in a calculation cell with 15AA vacuum on both sides.<br>
<br>
L_z = 15AA + graphene sheet (0 AA) + 15AA = 30 AA<br>
The graphene sheet is located at z=0.<br>
<br>
For bc1 calculation, you do not need to use esm_w. For bc2 or bc3, if you want to put ESM(metal) electrode at the position of z= +/- 15AA (for bc2) or z= +15AA (for bc3), esm_w = 0.0. The esm_w specifies the offset value of the ESM(metal) electrode position from the cell edge (z=+/- L_z/2). Thus, if you want to put the electrode on z= + 18AA, the esm_w must be 3AA.<br>
<br>
Best regards,<br>
Minoru<br>
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From: <a href="mailto:pw_forum-bounces@pwscf.org">pw_forum-bounces@pwscf.org</a> <<a href="mailto:pw_forum-bounces@pwscf.org">pw_forum-bounces@pwscf.org</a>> on behalf of Rajesh <<a href="mailto:creativeidleminds@gmail.com">creativeidleminds@gmail.com</a>><br>
Sent: Wednesday, July 26, 2017 8:34:20 PM<br>
To: PWSCF Forum<br>
Subject: [Pw_forum] ESM method<br>
<div><div class="h5"><br>
Dear Users,<br>
<br>
in the manual I find this "ESM region begins at z = +/- [L_z/2 + esm_w]". Suppose I have graphene sheet of with 3.33Angstrom as its thickness and I want to apply a 15Angstrom vacuum on both sides of the sheet. What are z and L_z/2 here?? is L_z/2=3.33A?? and Then what will be the value of position offset esm_w?? is esm_w=15angstrom?? and z=3.33+15+15=33.3 Angstrom? Please explain.<br>
<br>
<br>
Thank you.<br>
<br>
<br>
<br>
Rajesh<br>
<br>
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