SciPost Submission Page
Out-of-equilibrium full-counting statistics in Gaussian theories of quantum magnets
by Riccardo Senese, Jacob H. Robertson, Fabian H. L. Essler
Submission summary
Authors (as registered SciPost users): | Riccardo Senese |
Submission information | |
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Preprint Link: | scipost_202401_00001v1 (pdf) |
Date submitted: | 2024-01-04 10:42 |
Submitted by: | Senese, Riccardo |
Submitted to: | SciPost Physics |
Ontological classification | |
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Academic field: | Physics |
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Approach: | Theoretical |
Abstract
We consider the probability distributions of the subsystem (staggered) magnetization in ordered and disordered models of quantum magnets in D dimensions. We focus on Heisenberg antiferromagnets and long-range transverse-field Ising models as particular examples. By employing a range of self-consistent time-dependent mean-field approximations in conjunction with Holstein-Primakoff, Dyson-Maleev, Schwinger boson and modified spin-wave theory representations we obtain results in thermal equilibrium as well as during non-equilibrium evolution after quantum quenches. To extract probability distributions we derive a simple formula for the characteristic function of generic quadratic observables in any Gaussian theory of bosons.
Current status:
In refereeing