Questions tagged [spin-orbit-coupling]

For questions related to the calculation of the interaction of spin electronic states or weak magnetic interaction between an electrons spin and orbital motion.

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Why I have difference between DOS and BAND gap?

As they advise everywhere, SKF should be considered without SOC, and already in NSCF, spin-orbit interaction should be included. But what is the actual question, as I know, band splitting occurs with ...
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density of state with spin orbit coupling

I have been doing DOS calculations with SOC tag on in VASP, and another calculation without SOC. As shown in the figure the DOS with SOC seems strange! is this wrong? How can I have resolved I have ...
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How to compute spin projections in QE?

It's well known that VASP can print three orthogonal spin projections at each k point corresponding to each band in the file PROCAR controlled by the tags LORBIT and RWIGS. Is there a way to obtain ...
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8 votes
2 answers
160 views

How to obtain spin projected band structure for system with Spin Orbit Coupling?

Spin-orbit coupling[1] means the system has a non-collinear spin. Therefore, spin exists as a spinor, hence there is no meaning to 'up' and 'down' spin. Still, is there any way to get fat-band plot ...
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Some questions on case.energy and case.energyso in WIEN2k

In WIEN2k, the subprogram lapwso will generate both case.energy and case.energyso files. ...
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9 votes
1 answer
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Is it possible to do a collinear spin-orbit calculation in Quantum ESPRESSO?

In the presence of a 2D crystal and spin-orbit coupling, the SU(2) spin axial vector (Sx,Sy,Sz) decouples into an in-plane (Sx,Sy) and out-of-plane part Sz. For Quantum ESPRESSO, is there a way to ...
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6 votes
0 answers
90 views

Spin-orbit coupling in Siesta [closed]

I am going to simulate the electronic structure of the Au 111 surface including Fe-centered porphyrin on top. Since the molecule includes Fe, I first did spin-polarized calculations. Using converged ...
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How to change the magnetization direction in Quantum ESPRESSO?

I have a magnetic crystal system. I want to calculate the total energy of the system if the magnetization direction is aligned in different directions such as [110], [010]. By default Quantum ESPRESSO ...
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Error in nscf calculation while considering Spin Orbit Coupling in Quantum ESPRESSO

I am trying to do the band structure calculation considering the Spin Orbit Coupling but getting the following error: ...
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7 votes
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In which cases should SOC be included?

When dealing with 2D materials and monolayer families like : transition metal trihalides, TMDCs,...etc. In which cases SOC should be included in our calculations ?
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5 votes
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HSE06+SOC calculation in VASP: How to remove false k-points? [closed]

I followed the steps mentioned in the answer of question: How to carry out HSE06+SOC band structure calculation using VASP but I found a zigzag band structure. Any idea how to remove false k-points in ...
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6 votes
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How to formulate the second quantization of Dzyaloshinskii-Moriya interaction?

The Dzyaloshinskii-Moriya interaction (DMI) existing in the interface of the ferromagnetic insulator and the metal with strong spin-orbit coupling (SOC) is shown below. Mathematically, it can be ...
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7 votes
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Calculating the band structure of Bi2Se3 with spin-orbit coupling

I would like to simulate $\ce{Bi_2Se_3}$ using a DFT calculation on VASP. However, it seems I am not able to get a result; the electronic steps take $\sim \infty$ of time to complete. Here are the ...
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8 votes
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Bloch wave function extraction for the specific k-points and specific band from QE calculation [closed]

I would like to use QE to obtain u_K(r), which is the Bloch wave function of spin-up maximum valance band at K point. If I define the K point in the input file and do an SCF calculation by QE ...
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4 votes
0 answers
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How to compile VASP without the flags -DNGXhalf and -DNGZhalf? [closed]

I'm trying to do spin-orbit coupling calculations with VASP but when I started to run them, I got this error: ...
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7 votes
1 answer
524 views

HSE06+SOC method using VASP

I have a query on HSE06 + SOC method in VASP. This is a follow-up question to the comment given for a similar question at: How to carry out HSE06+SOC band structure calculation using VASP? I haven't ...
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Can the anomalous Hall effect only be applied to magnetic materials?

As I understand the anomalous Hall effect, in materials with a strong spin-orbit coupling, the intrinsic deflection effect is dominant over the side jump and skew scattering effects. In the intrinsic ...
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5 votes
1 answer
56 views

Help with definitions of SOC and ferromagnetic exchange terms in MoS2 Hamiltonian

I am trying to write eq. 2 in this PDF into matrix form (reproduced below) for numerical purposes. There are some definitions that I am not too familiar with, and don't seem to be given in the paper. $...
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4 votes
1 answer
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VASP GW+SOC band structure calculations

How may I carry out GW+SOC a band structure calculation using VASP? Could anyone familiar describe it step-by-step? I could not find any info regarding this on the VASP wiki.
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13 votes
1 answer
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How to determine which levels correspond to each other in LS coupling and jj-coupling?

In the LS coupling scheme, L, S and J are good quantum numbers; whereas in jj-coupling scheme, j1, j2 and J are good quantum numbers. I have learnt how to get the term symbols for LS coupling, and for ...
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4 votes
1 answer
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How to change the spin-orbit coupling strength in VASP?

Since the effect of spin-orbit coupling plays an important role in a topological insulator, How to change the spin-orbit coupling strength in VASP?
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8 votes
1 answer
300 views

Regarding spin-orbit coupling on DFT codes

In most DFT codes like QE and VASP, spin-orbit coupling (SOC) can be incorporated by employing fully relativistic pseudopotentials. My question is with regard to the implementation of SOC among ...
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4 votes
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How can I obtain seperate spin-up and spin-down bands while considering Spin Orbit Coupling in Quantum ESPRESSO?

I have been studying a magnetic material with SoC taken into consideration. The main aim was to obtain the band structure. when I use spin_component = 1 in the ...
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9 votes
2 answers
304 views

Can we consider SOC in FM materials using QE?

This is a follow-up question to my question posted here. I've been trying to study the effects of spin-orbit coupling (SOC) on the band structure of ferromagnetic (FM) material VSe$_{2}$. The input ...
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Should I use a lower threshold for calculations involving SOC?

I'm studying a compound $\ce{VSe_2}$ using the DFT package Quantum ESPRESSO (QE). The following is the input file. ...
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Is there a way I could calculate the pressure and use SOC at the same time? [closed]

I have been trying to find the appropriate k-point grid via convergence in quantum ESPRESSO (QE). The following is my input file. ...
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8 votes
3 answers
489 views

For which elements should I include spin orbit coupling in Quantum ESPRESSO?

I'm trying to study a Yb-Ge-Sb compound and would like to include spin-orbit coupling (SOC). In Quantum ESPRESSO, this is done by including the following tags in the ...
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13 votes
2 answers
1k views

How many spin states do Cu+ and Cu2+ have and why?

I know an electron can have two spin states, "spin up" and "spin down", but recently I was asked how many spin states do $\ce{Cu^+}$ and $\ce{Cu^{2+}}$ have, and why? Does anyone ...
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10 votes
2 answers
332 views

Spin orbit coupling from spin polarized density of states?

My knowledge in these areas of physics is lacking, so please expect naivety ahead (perhaps, dumb down your answer accordingly). From what I read online, spin orbit coupling is how the angular momentum ...
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16 votes
3 answers
920 views

What's the difference between spin-unpolarized, spin-polarized and non-colinear calculation?

The central goal of the first-principles simulation with DFT is to solve the Kohn-Sham equation: $$[-\dfrac{1}{2}\nabla^2+v_{\textit{eff}}(\vec{r})]\phi_n(\vec{r})=E_n\psi_n(\vec{r}) \tag{1}$$ Here ...
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17 votes
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What is the difference between Ultrasoft, ONCV and PAW Pseudopotentials? Which is better for a spin-orbit coupled calculation?

I am trying to do spin-orbit coupled calculations for various topological insulators. I have found papers using Quantum Espresso with ONCV pseudopotentials and papers using VASP with PAW ...
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9 votes
0 answers
125 views

Is the non-trivial band topology in a system, caused by spin-orbit-coupling or band inversion? [closed]

How can we know that the non-trivial band topology in a system is driven by spin-orbit coupling (SOC) or by band inversion? Based on my understanding, SOC causes the band inversion and makes the ...
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11 votes
1 answer
137 views

Spin density in systems with non-collinear magnetism using VASP

I have recently been working with non-collinear antiferromagnetic systems. I understand that, in order to obtain spin density, one must obtain the electron density in one configuration of spin and ...
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11 votes
1 answer
68 views

How to generate relativistic pseudo-potential using Vanderbilt USPP that captures spin-orbit coupling?

I have used Vanderbilt USPP for generating a pseudopotential that does not include the spin-orbit term. But I want to have the spin-orbit coupling term included in the pseudopotential, to do ...
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15 votes
2 answers
1k views

Total spin and/or multiplicity for transition metal ions?

I am trying to input various charge states of various transition metal ion species into DFT calculations. The program requires an input of multiplicity = 2*(total spin) + 1. I have an undergraduate-...
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10 votes
1 answer
501 views

Spin–orbit interaction with DFT

I'm new to DFT. Does the DFT take into account the spin-orbit interaction? On the one hand, this is a relativistic effect, perhaps DFT does not take it into account. However, on the other hand, I ...
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