Questions tagged [solid-state-physics]
Questions about solid state physics.
22
questions
6
votes
0answers
64 views
Example of a standard/archetypal/simple 4-band gapped condensed matter model with analytic results?
I am looking to study Berry phase-like phenomena in a gapped 4-band material model. In particular, I want to numerically and analytically calculate the Abelian Berry curvature integral of each band ...
6
votes
1answer
53 views
Example of a standard/archetypal/simple 4-band un-gapped condensed matter model with analytic results?
I am looking to study Berry phase-like phenomena in an un-gapped material model. However, I am having trouble finding a widely-used 4-band model with analytic expressions for wavefunctions and ...
4
votes
0answers
41 views
Why does numerical computation of Berry curvature give me correct Berry phase when it is supposed to diverge?
I implemented the standard numerical algorithm for calculating the Berry curvature in MATLAB. For a given 2D system, I can visualize the Berry curvature over parameter space. If I sum the Berry ...
4
votes
0answers
20 views
Doubt in how dynamic strain aging and static strain aging are different from each other in its effect and phenomenon
I do understand how static strain aging occurs and why the yield point comes back if ample time is allotted after a loading and unloading cycles primarily due to diffusion of substitutional and ...
8
votes
2answers
100 views
What will break the time-reversal symmetry?
Specifically, I am interested in the time-reversal symmetry $(\mathcal{T})$ in quantum mechanics. The $\mathcal{T}$ is considered as an anti-unitary operator, namely:
$$\mathcal{T}\psi(\vec{r},t)=\psi^...
5
votes
1answer
45 views
elastic constants transformation/basis change P21/a -> P21/n
I just calculated the stiffness tensor for a given material (a monoclinic molecular crystal)
using molecular simulation. When trying to compare my results to published experimental results
I found ...
17
votes
12answers
5k views
Is it better for me to study chemistry or physics?
I might decide to pursue material science.
Aptitude and background
I am from the UK, and for A-levels, I am studying Maths, Further Maths, Physics and Chemistry, and I am predicted decent grades in ...
7
votes
0answers
110 views
Can we calculate bond enthalpies for each bond in a supercell of a disordered AB crystal using DFT?
Apart from using Bader charge analysis or energy of formation estimation, I wonder if there is a way to compute the bond energy of constituent bonds in a crystal using density functional theory.
Let's ...
7
votes
1answer
487 views
What is the physical meaning of occupations='smearing' in Quantum ESPRESSO?
I want to understand, what is the intuition behind using the occupations='smearing' or 'tetrahedra' in Quantum ESPRESSO input file? I mean how we can interpret what is going to happen inside of ...
7
votes
2answers
68 views
Combined effects of strain and doping on the electronic structure of semiconductors
I've read papers in DFT studies on band gap tuning in semiconductors and the usually studied methods are either through doping or application of external strain. But it is always just one or the other....
10
votes
1answer
809 views
How to understand the crystal field splitting of d-orbitals in a trigonal prismatic geometry?
This question is coming from this paper, which investigated the spontaneous spin and valley polarizations of monolayer LaBr2.
The geometric information of monolayer LaBr2 is displayed as following (Br:...
10
votes
2answers
242 views
Morse potential for phonons in solids instead of the harmonic potential approximation?
As the title says, the Morse potential (https://en.wikipedia.org/wiki/Morse_potential) is an exactly solvable model in quantum mechanics, just like the quantum harmonic oscillator. Extensions of it ...
8
votes
1answer
288 views
How to perform virtual crystal approximation calculations in VASP?
Can someone share appropriate tags and methods to perform virtual crystal approximation calculations in VASP?
8
votes
1answer
136 views
How to calculate the orthogonal representation of a HCP cell?
I'm trying to write a program to calculate the neighbor lists of crystal systems. I found a few codes that are able to calculate it for orthogonal systems. How can I do it for non-orthogonal cells ?
...
10
votes
0answers
68 views
What are the methods of modeling Jahn-Teller effects in a solid-state material? [closed]
The Jahn-Teller effect arises from the symmetry breaking (distortion) of the local environment for the crystal field of 3d transitional metal ions.The distortion result in energy saving of electronic ...
9
votes
0answers
90 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 ...
6
votes
1answer
68 views
Charge density wave and band inversion
Is there any connection between charge density wave and band inversion? Or is there any system in which band inversion follows the same mechanism as the CDW? I am just trying to find a connection ...
12
votes
0answers
149 views
Why does the Wolff algorithm slow down in a 4-body Ising model?
In the paper that introduced "Self-learning MC" (an ML-inspired MC technique, as I understand) the authors consider a many-body Ising model as an example to show the efficiency of their ...
11
votes
1answer
112 views
Ising models with many-body interactions
I find it surprisingly difficult to find researches/papers on systematic "many-body interaction" extensions of the Ising model. Can somebody tell me a good review/article etc on this matter ...
13
votes
4answers
247 views
What are some open-source all-electron DFT alternatives to Wien2K?
Since the beginning of the century, Wien2K has proven to be a very powerful player in computational condensed matter and materials physics.
Wien2K is an all-electron periodic DFT code based on the ...
12
votes
1answer
766 views
Labeling of high symmetry points in Brillouin zone
A Brillouin zone is defined as a Wigner~Secitz primitive cell in the reciprocal lattice [1,2].
The construction of the first Brillouin zone for two different 2D lattices are shown below:
The ...
20
votes
1answer
139 views
What class of materials are closest to realizing the tunable coupling Hamiltonian?
From a physics point of view, there is an effective (approximation to second-order coupling Jaynes-Cummings) Hamiltonian of the form [1]
\begin{equation}
H=\sum_j\omega_j(t)\sigma_j^z+\sum_{\langle i,...
