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 |
| Specialties: |
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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