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首页> 外文期刊>Physical review >Ultrastrong coupling between a cavity resonator and the cyclotron transition of a two-dimensional electron gas in the case of an integer filling factor
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Ultrastrong coupling between a cavity resonator and the cyclotron transition of a two-dimensional electron gas in the case of an integer filling factor

机译：在填充因子为整数的情况下，腔谐振器与二维电子气回旋加速器之间的超强耦合

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摘要

We investigate theoretically the coupling between a cavity resonator and the cyclotron transition of a two-dimensional electron gas under an applied perpendicular magnetic field. We derive and diagonalize an effective quantum Hamiltonian describing the magnetopolariton excitations of the two-dimensional electron gas for the case of integer filling factors. The limits of validity of the present approach are critically discussed. The dimensionless vacuum Rabi frequency Ω_0/ω_0 (i.e., normalized to the cyclotron frequency ω_0) is shown to scale as (αn_(QW)v~(1/2)), where α is the fine structure constant, n_(QW) is the number of quantum wells and v is the filling factor in each well. We show that with realistic parameters of a high-mobility semiconductor two-dimensional electron gas, the dimensionless coupling Ω_0/ω_0 can be much larger than 1 in the case of v? 1, the latter condition being typically realized for cyclotron transitions in the microwave range. Implications of such ultrastrong coupling regime are discussed.
机译：我们在理论上研究了在垂直磁场作用下腔共振器与二维电子气回旋加速器之间的耦合。对于整数填充因子，我们推导并对角化有效的量子哈密顿量，该哈密顿量描述了二维电子气的磁极激发。严格讨论了本方法的有效性限制。无量纲真空拉比频率Ω_0/ω_0（即归一化为回旋加速器频率ω_0）按比例缩放为（αn_（QW）v〜（1/2）），其中α为精细结构常数，n_（QW）为量子阱的数量，v是每个阱的填充因子。我们证明，在具有高迁移率半导体二维电子气的实际参数的情况下，在v？的情况下，无量纲耦合Ω_0/ω_0可以比1大得多。在图1中，对于微波范围中的回旋加速器转换通常实现后一种条件。讨论了这种超强耦合机制的含义。

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