# Questions tagged [lattice-model]

Lattice is a way of discretizing a quantum field theory for numerical simulations.

370 questions
Filter by
Sorted by
Tagged with
46 views

### Solving some equations from lattice and boltzmann paper

i have solved equation 1 in this way I am a student of mathematics I am solving some equations from the lattice Boltzmann paper, but I can't please help you solve them. I want help to solve equation ...
1 vote
29 views

### Question on computation in the paper "Objective interpretations of quantum mechanics and the possibility of a deterministic limit" from A. Sudbery

At the moment I am reading the paper: "Objective interpretations of quantum mechanics and the possibility of a deterministic limit", from A. Sudbery, and I am struggling to understand a ...
• 399
28 views

### $R$ projection operator in entanglement entropy

I was reading a paper about entanglement entropy. The author introduced a real space cutoff operator $R$ which he claimed to project onto a real space subregion. Then he used $\bar P:=RPR$ as an ...
37 views

### The reason why the Nielsen-Nimiya Theorem doesn't have to hold true in the Floquet system?

According to the Nielsen-Ninomiya (NN) theorem, under appropriate assumptions, the number of right-handed and left-handed particles must be equal in a lattice system. On the other hand, in recent ...
• 683
52 views

### What is a basis actually is and how it differs from primitive unit cell?

I have some questions about primitive unit cell and basis. These are: Is the basis the smallest identical fragment of a crystal which repeats in a pattern throughout the crystal? Or can it be an ...
17 views

### Response function in a honeycomb lattice

My doubt is the following: If we calculate the response function of a honeycomb lattice in the three spatial directions, the xx components will be always equal to yy. I imagine that it is because of ...
24 views

### Spin correlation function in a Heisenberg model and its relationship to Green function in Hubbard model

Consider the Hubbard model on a lattice: $$\hat{H} = -t\sum_{\langle i,j \rangle, \sigma}\hat{c}^\dagger_{i\sigma}\hat{c}_{j\sigma}+U\sum_i \hat{n}_{i\uparrow}\hat{n}_{i\downarrow}.$$ Downfolding ...
• 1,166
11 views

### Bells jump process on the lattice, simple example

At the moment i am reading the paper of Vink, "Quantum mechanics in terms of discrete beables". (http://www.psiquadrat.de/downloads/vink93.pdf) Here, in section III, Vink uses Bells beable ...
• 399