Quantum vacuum properties of the intersubband cavity polariton field
Quantum vacuum properties of the intersubband cavity polariton field
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DOI：
10.1103/physrevb.72.115303
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发表时间：
2005-09-01
影响因子：
3.7
通讯作者：
Carusotto, I
中科院分区：
文献类型：
--
作者：
Ciuti, C;Bastard, G;Carusotto, I
在二维电子气存在的情况下，我们给出了与半导体子带间跃迁强耦合的平面微腔光子模的量子描述。我们证明，在这类系统中，真空拉比频率Omega(R)可以是子带间跃迁频率Omega(12)的重要分数。这种超强的光-物质耦合机制对于长波长跃迁是增强的，因为对于给定的掺杂浓度、有效质量和量子井数，Omega(R)/omega(12)的比率随着子带间发射波长的平方根而增加。我们描述了基态(双模压缩真空)的量子性质，它可以通过改变Omega(R)的值来原位调谐，例如通过静电门。最后，我们指出如何利用极化子量子真空的可调性，通过量子电动力学现象产生与动力学Casimir效应类似的关联光子对。
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.