Questions tagged [quantum-monte-carlo]
Questions related with quantum Monte Carlo methods.
16
questions
16
votes
1answer
670 views
Deep Neural Networks: Are they able to provide insights for the many-electron problem or DFT?
The solution of the many-electron Schrodinger equation is the key to understand the properties of matter. However, it is notorious due to the exponential wall (for example, see section II (C) of ...
7
votes
0answers
66 views
What are the advantages/disadvantages of QMC over ACFDT-RPA?
I had some experience with the ACFDT-RPA, despite its promising features it's not practical most of the times, and for that reason, I'm looking for a new method for reference calculations. QMC is the ...
10
votes
1answer
168 views
Are QMC calculations practical for periodic structure calculations?
Even some DFT methods or beyond DFT methods such as MP2 calculations are computationally very expensive today even with clusters. If you compare QMC (quantum monte carlo) calculations with them, are ...
7
votes
1answer
84 views
Support for orbital-space Quantum Monte Carlo in CASINO?
Is CASINO code capable of performing orbital-space QMC calculations?
7
votes
0answers
39 views
What packages exist for building quantum Monte Carlo simulations of spin Hamiltonians? [closed]
What packages exist that can help someone, especially a new masters/PhD student get started with QMC on spin systems.
As an example, for writing a stochastic series expansion QMC program for the 2D ...
13
votes
2answers
127 views
Order of scaling for different algorithms
There are many different computational methods used in matter modelling. For example: solving multi-electron Schroedinger equation, DFT with different approximations, Quantum Monte Carlo, etc.
How ...
10
votes
3answers
180 views
What are the types of Quantum Monte Carlo?
Similar to:
What are the types of SCF?
What are the types of MCSCF?
What are the types of ab initio Molecular Dynamics?
What are the types of pseudopotentials?
What are the types of DFT?
What are the ...
32
votes
1answer
2k views
Was Walter Kohn wrong about this?
In Kohn's Nobel Lecture, he claimed that:
"In general the many-electron wave function $\Psi(\mathbf{r}_1,\ldots,\mathbf{r}_N)$ for a system of $N$ electrons is not a legitimate scientific concept,...
14
votes
1answer
87 views
How accurately are magnetic effects treated in *ab initio* methods?
I am a condensed matter theorist and I mostly use quantum Monte Carlo methods. I use models like the Heisenberg model, an represent an extreme simplification of real materials to just localized spin ...
12
votes
0answers
217 views
How to understand dynamical spin structure factor? [closed]
A newish area of interactions between quantum Monte Carlo (QMC) and experiments is in spin spectra. Recent improvements in stochastic analytic continuation have made it much easier to compare/extract ...
18
votes
1answer
88 views
How can very small lattices be sufficient for Quantum Monte Carlo simulations?
Quantum Monte Carlo simulations are often performed with very modest lattice sizes (such as [e-print], $64$ sites), due to their computational cost increasing exponentially with the system volume; ...
12
votes
2answers
138 views
Autocorrelation function problem in Monte Carlo simulation of 2D Ising model
Currently, I did a Monte Carlo simulation with the local update and Wolff cluster updated in 2D classical Ising model. I use the autocorrelation function to compare 2 different algorithm in critical ...
16
votes
2answers
68 views
Is there a list of models that do and do not have the QMC sign problem?
The sign problem is a huge limitation of QMC, but it's not easy to tell by looking at a Hamiltonian if it has the sign problem. Often there will be some clever transformation that allows you to avoid ...
11
votes
1answer
205 views
What are good resources to learn Materials Modeling? [closed]
I wonder if there are any books or resources to start learning Materials modelling using methods
density functional theory
quantum monte carlo
molecular dynamics
24
votes
1answer
145 views
Is there a “gold standard” method in materials modeling for obtaining ground state energy?
In quantum chemistry, coupled-cluster methods, especially CCSD(T), with complete basis set extrapolation are often considered a "gold-standard" for closed-shell molecules. This means that we consider ...
21
votes
1answer
83 views
QMC calculation of the equation of state of metals
Is diffusion/variational quantum Monte Carlo applicable to the calculation of the athermal (zero temperature, no zero point energy) equation of state of metals including electronic correlation? For ...
