All Questions
4 questions
3votes
1answer
130views
Green function power-law behavior in real and momentum space
Given a Green's function with pawer-law behavior in $k$-space $g(k)\sim\frac{1}{k^a}$ (at least for small $k$), what is the asymptotic form for $g(x)$ in the real space? In the paragraph above Eq. (56)...
- 3,942
2votes
0answers
181views
Fourier Transform of Density Operator boosting momentum
I am currently reading Girvin and Yang's book on Condensed Matter Physics. I am reading up on the dynamical structure factor and in Section 4.3 where they talk about how $\rho_{+q}$, which is defined ...
- 21
2votes
0answers
210views
Obtaining real-space correlations from reciprocal space correlations
Consider a system of Ising variable $s = \pm 1$ on a rectangular lattice which has open boundary conditions on the top and bottom and periodic boundary conditions to the left and right. In other words,...
- 3,860
1vote
1answer
118views
Shear strain correlations from displacement Fourier transform
Currently working with molecular dynamics simulations, I would like to compute shear strain correlations in my 2-dimensional system. How I used to do things Accumulated shear strain at position $\...
- 102
