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@article{Tufarelli:2015:10.1103/PhysRevA.91.063840,
author = {Tufarelli, T and McEnery, KR and Maier, SA and Kim, MS},
doi = {10.1103/PhysRevA.91.063840},
journal = {Physical Review A},
title = {Signatures of the A2 term in ultrastrongly coupled oscillators},
url = {http://dx.doi.org/10.1103/PhysRevA.91.063840},
volume = {91},
year = {2015}
}

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TY  - JOUR
AB  - We study a bosonic matter excitation coupled to a single-mode cavity field via electric dipole. Counter-rotating and A2 terms are included in the interaction model, A being the vector potential of the cavity field. In the ultrastrong coupling regime the vacuum of the bare modes is no longer the ground state of the Hamiltonian and contains a nonzero population of polaritons, the true normal modes of the system. If the parameters of the model satisfy the Thomas-Reiche-Kuhn sum rule, we find that the two polaritons are always equally populated. We show how this prediction could be tested in a quenching experiment, by rapidly switching on the coupling and analyzing the radiation emitted by the cavity. A refinement of the model based on a microscopic minimal coupling Hamiltonian is also provided, and its consequences on our results are characterized analytically.
AU  - Tufarelli,T
AU  - McEnery,KR
AU  - Maier,SA
AU  - Kim,MS
DO  - 10.1103/PhysRevA.91.063840
PY  - 2015///
SN  - 1094-1622
TI  - Signatures of the A2 term in ultrastrongly coupled oscillators
T2  - Physical Review A
UR  - http://dx.doi.org/10.1103/PhysRevA.91.063840
UR  - http://hdl.handle.net/10044/1/40686
VL  - 91
ER  -

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Professor Myungshik Kim

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