期刊
PHYSICAL REVIEW A
卷 87, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.87.023831
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资金
- US NSF [DMR-1103860]
- US Army Research Office [W911NF-12-1-0227]
- AFOSR MURI
- Packard Foundation
- DARPA OLE program
- DFG [Str 1176/1-1]
- Austrian Science Fund (FWF) through SFB FOQUS [F4016-N16]
- Austrian Science Fund (FWF) through START Grant [Y 581-N16]
- European Commission (AQUTE, NAMEQUAM)
- Institut fur Quanteninformation GmbH
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1103860] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [969816, 1125846] Funding Source: National Science Foundation
- Austrian Science Fund (FWF) [Y 581] Funding Source: researchfish
We investigate nonequilibrium phase transitions for driven atomic ensembles interacting with a cavity mode and coupled to a Markovian dissipative bath. In the thermodynamic limit and at low frequencies, we show that the distribution function of the photonic mode is thermal, with an effective temperature set by the atom-photon interaction strength. This behavior characterizes the static and dynamic critical exponents of the associated superradiance transition. Motivated by these considerations, we develop a general Keldysh path-integral approach that allows us to study physically relevant nonlinearities beyond the idealized Dicke model. Using standard diagrammatic techniques, we take into account the leading-order corrections due to the finite number N of atoms. For finite N, the photon mode behaves as a damped classical nonlinear oscillator at finite temperature. For the atoms, we propose a Dicke action that can be solved for any N and correctly captures the atoms' depolarization due to dissipative dephasing. DOI: 10.1103/87.023831
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