[QE-users] Issue with Nanoribbon Band Structure of GeI
Larry Shi
larryshi02 at gmail.com
Mon Aug 10 23:17:33 CEST 2020
Hi,
Thanks for your reply. I used the same k-points as in the literature; I
tried both M-Γ-M and Z-Γ-Z. I'm guessing the problem has to do with my
choice of ibrav since the k-points depend on it. I used ibrav=8
(orthorhombic). Is this the right Bravais lattice for a nanoribbon?
Thanks,
Larry
On Mon, Aug 10, 2020 at 3:56 PM Mona Asadinamin <Mona.a at uga.edu> wrote:
> Hi;
>
> Are you sure about your kpath and the way you have set them up in QE? I
> had the same problem for another system and it was due to the wrong kpoints.
>
>
> Best regards;
>
>
> Mona Asadi Namin
>
> Graduate student
>
> Center for simulational physics
>
> University of Georgia
>
> --------------------------------------
>
> Email:mona.a at uga.ed <mona.a at uga.edu>u <mona.a at uga.edu>
>
> Phone: +1-215-906-23-92
>
>
> ------------------------------
> *From:* users <users-bounces at lists.quantum-espresso.org> on behalf of
> Larry Shi <larryshi02 at gmail.com>
> *Sent:* Tuesday, August 4, 2020 9:55 PM
> *To:* users at lists.quantum-espresso.org <users at lists.quantum-espresso.org>
> *Subject:* [QE-users] Issue with Nanoribbon Band Structure of GeI
>
> [EXTERNAL SENDER - PROCEED CAUTIOUSLY]
>
> Dear QE gurus,
>
> I am new to QE and I am currently trying to replicate the band structure
> for a GeI nanoribbon (https://doi.org/10.1103/PhysRevB.89.115429). I
> passivated the Ge atoms with H atoms. When I run the band input file
> (below) after the SCF has been converged, the bands in the resulting band
> structure are all straight lines (they all have constant energy), which is
> absurd. I'm not sure where the issue originates.
>
> Any assistance would be greatly appreciated!
>
>
> &CONTROL
> calculation = "bands"
> max_seconds = 5.18400e+06
> pseudo_dir = "C:\Users\User\.burai\.pseudopot"
> /
>
> &SYSTEM
> a = 4.62000e+01
> angle1(1) = 0.00000e+00
> angle1(2) = 0.00000e+00
> angle2(1) = 0.00000e+00
> angle2(2) = 0.00000e+00
> b = 7.01480e+00
> c = 3.00000e+01
> cosab = -5.00000e-01
> degauss = 1.00000e-02
> ecutrho = 1.00000e+02
> ecutwfc = 2.50000e+01
> ibrav = 8
> lspinorb = .FALSE.
> nat = 32
> nbnd = 128
> nspin = 1
> ntyp = 3
> occupations = "smearing"
> smearing = "gaussian"
> starting_magnetization(1) = 0.00000e+00
> starting_magnetization(2) = 0.00000e+00
> /
>
> &ELECTRONS
> conv_thr = 1.00000e-07
> electron_maxstep = 200
> mixing_beta = 7.00000e-01
> startingpot = "atomic"
> startingwfc = "atomic+random"
> /
>
> &BANDS
> lsym = .FALSE.
> spin_component = 1
> /
>
> K_POINTS {tpiba_b}
> 3
> Z 40
> gG 40
> Z 40
>
> ATOMIC_SPECIES
> Ge 72.61000 Ge.pbe-n-rrkjus_psl.1.0.0.UPF
> I 126.90447 I.pbe-mt_bw.UPF
> H 1.00794 H.pbe-rrkjus.UPF
>
> ATOMIC_POSITIONS {angstrom}
> H -2.005606 1.098069 29.911525
> Ge 0.019394 2.178887 0.673171
> Ge 1.988303 1.098069 29.911525
> I 0.170697 2.062988 3.223532
> I 2.089141 1.028047 27.356392
> H -2.005606 5.686290 0.673171
> Ge -0.036697 4.605472 29.911525
> I 0.064141 4.535450 27.356392
> Ge 4.069394 2.178887 0.673171
> Ge 6.038303 1.098069 29.911525
> I 4.220697 2.062988 3.223532
> I 6.139141 1.028047 27.356392
> Ge 2.044394 5.686290 0.673171
> Ge 4.013303 4.605472 29.911525
> I 2.195697 5.570391 3.223532
> I 4.114141 4.535450 27.356392
> Ge 8.119394 2.178887 0.673171
> Ge 10.088303 1.098069 29.911525
> I 8.270697 2.062988 3.223532
> I 10.189141 1.028047 27.356392
> Ge 6.094394 5.686290 0.673171
> Ge 8.063303 4.605472 29.911525
> I 6.245697 5.570391 3.223532
> I 8.164141 4.535450 27.356392
> Ge 12.169394 2.178887 0.673171
> H 14.138303 1.098069 29.911525
> I 12.320697 2.062988 3.223532
> Ge 10.144394 5.686290 0.673171
> Ge 12.113303 4.605472 29.911525
> I 10.295697 5.570391 3.223532
> I 12.214141 4.535450 27.356392
> H 14.138303 5.686290 0.673171
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