Fluctuation-Dissipation Relation in a Nonequilibrium Quantum Fluid
There is no simple fluctuation-dissipation theorem (FDT) for nonequilibrium systems. We show that for a fluid in a nonequilibrium steady state (NESS) characterized by a constant temperature gradient there is a generalized FDT that relates commutator correlation functions to the bilinear response of...
Saved in:
| Published in | Physical review letters Vol. 131; no. 24; p. 244001 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
15.12.2023
|
| Online Access | Get more information |
Cover
Loading…
| Summary: | There is no simple fluctuation-dissipation theorem (FDT) for nonequilibrium systems. We show that for a fluid in a nonequilibrium steady state (NESS) characterized by a constant temperature gradient there is a generalized FDT that relates commutator correlation functions to the bilinear response of products of observables. This allows for experimental probes of the long-range correlations in such a system, quantum or classical, via response experiments. We also show that the correlations are not tied to thermal fluctuations but are intrinsic to the NESS and reflect a generalized rigidity. |
|---|---|
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.131.244001 |