$η$ Pairing of Light-Emitting Fermions: Nonequilibrium Pairing Mechanism at High Temperatures$η$ Pairing of Light-Emitting Fermions: Nonequilibrium Pairing Mechanism at High Temperatures

Masaya Nakagawa, Naoto Tsuji, Norio Kawakami +1 more

Strongly interacting fermionic atoms are shown to develop $η$ -pairing superfluid correlations in a nonequilibrium steady state in the presence of spontaneous emission of light from atoms. On the basis of the Hubbard model subject to spontaneous decay between internal spin states, we show that prohibition of radiative decay due to the Pauli exclusion principle and destructive interference between doublon-decay processes lead to nonequilibrium $η$ pairing. Because of the non-thermal nature of the steady state, pair correlations arise even from a completely uncorrelated infinite-temperature initial state, allowing coherent atom pairs to be formed at high temperatures. Experimental implementation with fermionic atoms in an optical lattice is discussed.Strongly interacting fermionic atoms are shown to develop $η$-pairing superfluid correlations in a nonequilibrium steady state in the presence of spontaneous emission of light from atoms. On the basis of the Hubbard model subject to spontaneous decay between internal spin states, we show that prohibition of radiative decay due to the Pauli exclusion principle and destructive interference between doublon-decay processes lead to nonequilibrium $η$ pairing. Because of the non-thermal nature of the steady state, pair correlations arise even from a completely uncorrelated infinite-temperature initial state, allowing coherent atom pairs to be formed at high temperatures. Experimental implementation with fermionic atoms in an optical lattice is discussed.

arXiv:2103.13624Mar 25, 20213 citations

Atomic Radiative Processes

Elsevier eBooksJan 1, 198221 citations

Exchange effects on cooperative radiation interaction in a two-atom model

Thomas Östreich

We study cooperative effects on the radiation interaction of a pair of two-level atoms with a spatial separation r\ensuremath{\ll}${\ensuremath{\lambda}}_{0}$ much closer than the optical wavelength of the dipole transition. In this regime we allow for charge exchange between the atoms (hybridization), which leads to qualitatively different behavior in contrast to an isolated pair of atoms because of the presence of the monopole Coulomb interaction. The interaction of the atoms with the radiation field and an external classical driving field is treated within a master equation approach. The numerical as well as the analytical results indicate the existence of quantum beats in the radiative decay of the system. In the case of an external driving field the system shows a dark resonance for a fixed detuning independent of the strength of the external field.We study cooperative effects on the radiation interaction of a pair of two-level atoms with a spatial separation r\ensuremath{\ll}${\ensuremath{\lambda}}_{0}$ much closer than the optical wavelength of the dipole transition. In this regime we allow for charge exchange between the atoms (hybridization), which leads to qualitatively different behavior in contrast to an isolated pair of atoms because of the presence of the monopole Coulomb interaction. The interaction of the atoms with the radiation field and an external classical driving field is treated within a master equation approach. The numerical as well as the analytical results indicate the existence of quantum beats in the radiative decay of the system. In the case of an external driving field the system shows a dark resonance for a fixed detuning independent of the strength of the external field.

Physical Review ASep 1, 19941 citation

Spontaneous Radiative Decay of a Continuum

Dan Agassi

Springer eBooksJan 1, 19841 citation

η

Pairing of Light-Emitting Fermions: Nonequilibrium Pairing Mechanism at High Temperatures

Strongly interacting fermionic atoms are shown to develop

η

-pairing superfluid correlations in a nonequilibrium steady state in the presence of spontaneous emission of light from atoms. On the basis of the Hubbard model subject to spontaneous decay between internal spin states, we show that prohibition of radiative decay due to the Pauli exclusion principle and destructive interference between doublon-decay processes lead to nonequilibrium

η

pairing. Because of the non-thermal nature of the steady state, pair correlations arise even from a completely uncorrelated infinite-temperature initial state, allowing coherent atom pairs to be formed at high temperatures. Experimental implementation with fermionic atoms in an optical lattice is discussed.