Signatures of the A2 term in ultrastrongly coupled oscillators

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Title: Signatures of the A2 term in ultrastrongly coupled oscillators
Authors: Tufarelli, T
McEnery, KR
Maier, SA
Kim, MS
Item Type: Journal Article
Abstract: 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.
Issue Date: 29-Jun-2015
Date of Acceptance: 29-Jun-2015
ISSN: 1094-1622
Publisher: American Physical Society
Journal / Book Title: Physical Review A
Volume: 91
Issue: 6
Copyright Statement: © 2015 American Physical Society
Sponsor/Funder: Engineering & Physical Science Research Council (E
The Leverhulme Trust
Funder's Grant Number: EP/H000917/1
F/07 058/BK
Keywords: Science & Technology
Physical Sciences
Physics, Atomic, Molecular & Chemical
General Physics
02 Physical Sciences
01 Mathematical Sciences
03 Chemical Sciences
Publication Status: Published
Article Number: 063840
Appears in Collections:Quantum Optics and Laser Science
Experimental Solid State
Faculty of Natural Sciences

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