| | |
| | |
Stat |
Members: 3643 Articles: 2'487'895 Articles rated: 2609
29 March 2024 |
|
| | | |
|
Article overview
| |
|
Single hole dynamics in the t-J model on a square lattice | Michael Brunner
; Fakher F. Assaad
; Alejandro Muramatsu
; | Date: |
21 Feb 2000 | Journal: | Phys. Rev. B 62, 15480 (2000) | Subject: | Strongly Correlated Electrons | cond-mat.str-el | Abstract: | We present quantum Monte Carlo (QMC) simulations for a single hole in a t-J model from J=0.4t to J=4t on square lattices with up to 24 x 24 sites. The lower edge of the spectrum is directly extracted from the imaginary time Green’s function. In agreement with earlier calculations, we find flat bands around $(0,pmpi)$, $(pmpi,0)$ and the minimum of the dispersion at $(pmpi/2,pmpi/2)$. For small J both self-consistent Born approximation and series expansions give a bandwidth for the lower edge of the spectrum in agreement with the simulations, whereas for J/t > 1, only series expansions agree quantitatively with our QMC results. This band corresponds to a coherent quasiparticle. This is shown by a finite size scaling of the quasiparticle weight $Z(vec k)$ that leads to a finite result in the thermodynamic limit for the considered values of $J/t$. The spectral function $A(vec k, omega)$ is obtained from the imaginary time Green’s function via the maximum entropy method. Resonances above the lowest edge of the spectrum are identified, whose J-dependence is quantitatively described by string excitations up to J/t=2. | Source: | arXiv, cond-mat/0002321 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |