Quantum vacuum properties of the intersubband cavity polariton field
Year: 2005
Authors: Ciuti C., Bastard G., Carusotto I.
Autors Affiliation: Ecole Normale Super, Lab Pierre Aigrain, F-75005 Paris, France; INFM, CRS BEC, I-38050 Povo, Italy; Univ Trent, Dipartimento Fis, I-38050 Povo, Italy.
Abstract: We present a quantum description of a planar microcavity photon mode strongly coupled to a semiconductor intersubband transition in presence of a two-dimensional electron gas. We show that, in this kind of system, the vacuum Rabi frequency Omega(R) can be a significant fraction of the intersubband transition frequency omega(12). This regime of ultrastrong light-matter coupling is enhanced for long-wavelength transitions, because for a given doping density, effective mass and number of quantum wells, the ratio Omega(R)/omega(12) increases as the square root of the intersubband emission wavelength. We characterize the quantum properties of the ground state (a two-mode squeezed vacuum), which can be tuned in situ by changing the value of Omega(R), e.g., through an electrostatic gate. We finally point out how the tunability of the polariton quantum vacuum can be exploited to generate correlated photon pairs out of the vacuum via quantum electrodynamics phenomena reminiscent of the dynamical Casimir effect.
Journal/Review: PHYSICAL REVIEW B
Volume: 72 (11) Pages from: 115303-1 to: 115303-9
KeyWords: Dressed-state Lasers; Moving Mirror; Radiation; TimeDOI: 10.1103/PhysRevB.72.115303Citations: 525data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-10-20References taken from IsiWeb of Knowledge: (subscribers only)