dc.contributor.author | Cresser, JD | |
dc.contributor.author | Anders, J | |
dc.date.accessioned | 2021-10-13T13:12:50Z | |
dc.date.issued | 2021-12-17 | |
dc.description.abstract | The Gibbs state is widely taken to be the equilibrium state of a system in contact with an environment at temperature T. However, non-negligible interactions between system and environment
can give rise to an altered state. Here we derive general expressions for this mean force Gibbs state,
valid for any system that interacts with a bosonic reservoir. First, we derive the state in the weak
coupling limit and find that, in general, it maintains coherences with respect to the bare system
Hamiltonian. Second, we develop a new expansion method suited to investigate the ultrastrong coupling regime. This allows us to derive the explicit form for the mean force Gibbs state, and we find
that it becomes diagonal in the basis set by the system-reservoir interaction instead of the system
Hamiltonian. Several examples are discussed including a single qubit, a three-level V-system and
two coupled qubits all interacting with bosonic reservoirs. The results shed light on the presence
of coherences in the strong coupling regime, and provide key tools for nanoscale thermodynamics
investigations. | en_GB |
dc.description.sponsorship | Engineering and Physical Sciences Research Council (EPSRC) | en_GB |
dc.description.sponsorship | Royal Society | en_GB |
dc.identifier.citation | Vol. 127, article 250601 | en_GB |
dc.identifier.doi | 10.1103/PhysRevLett.127.250601 | |
dc.identifier.grantnumber | EP/R045577/1 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/127452 | |
dc.language.iso | en | en_GB |
dc.publisher | American Physical Society | en_GB |
dc.rights | © 2021 American Physical Society | |
dc.title | Weak and ultrastrong coupling limits of the quantum mean force Gibbs state | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2021-10-13T13:12:50Z | |
dc.identifier.issn | 0031-9007 | |
dc.description | This is the final version. Available from the American Physical Society via the DOI in this record | en_GB |
dc.identifier.eissn | 1079-7114 | |
dc.identifier.journal | Physical Review Letters | en_GB |
dc.rights.uri | http://www.rioxx.net/licenses/all-rights-reserved | en_GB |
dcterms.dateAccepted | 2021-10-11 | |
exeter.funder | ::European Commission | en_GB |
exeter.funder | ::Engineering and Physical Sciences Research Council (EPSRC) | en_GB |
rioxxterms.version | VoR | en_GB |
rioxxterms.licenseref.startdate | 2021-10-11 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2021-10-13T12:52:03Z | |
refterms.versionFCD | AM | |
refterms.dateFOA | 2021-12-21T15:46:40Z | |
refterms.panel | B | en_GB |