Spectral continuum in the Rabi-Stark model [Invited]

Sökning: L773:0740 3224 > Spectral continuum ...

Braak, Daniel (författare)

Cong, Lei (författare)

Eckle, Hans-Peter (författare)

Johannesson, Henrik, 1953 (författare): Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)

Twyeffort, Elinor k. (författare)

(creator_code:org_t)

2024
2024
Engelska.
Ingår i: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS. - 0740-3224 .- 1520-8540. ; 41:8

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Abstract Ämnesord

Stäng

The Rabi-Stark model is a nonlinear generalization of the quantum Rabi model including the dynamical Stark shift as a tunable term, which can be realized via quantum simulation on a cavity QED platform. When the Stark coupling becomes equal to the mode frequency, the spectrum changes drastically, a transition usually termed "spectral collapse" because numerical studies indicate an infinitely degenerate ground state. We show that the spectrum extends continuously from a threshold value up to infinity. A set of normalizable states is embedded in the continuum, which furnishes an unexpected analogy to the atomic Stark effect. Bound states and continuum can be obtained analytically through two equally justified but different confluence processes of the associated differential equation in Bargmann space. Moreover, these results are obtained independently using a method based on adiabatic elimination of the spin degree of freedom and corroborated through large-scale numerical checks. (c) 2024 Optica Publishing Group

Av författaren/redakt...: Braak, Daniel; Cong, Lei; Eckle, Hans-Pete ...; Johannesson, Hen ...; Twyeffort, Elino ...

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