We consider theoretically magnetic dipole mechanism of the IR-light absorption at intersubband transitions in wide-gap quantum wells (QW). In contrast to the electric dipole resonance, discussed mechanism manifests in the interaction with the s-polarized component of electromagnetic radiation. We demonstrated that a) the frequencies of magnetic and electric dipole intersubband transitions in 2D layer are equal in the framework of one-particle approximation; b) collective plasma effects should lead to a significant frequency shift between the magnetic and electric dipole resonances in typical QW. That is why independent measurements of the magnetic and electric dipole resonant frequencies could allow both the extracting the QW parameters and the experimental verifying of theoretical models of collective fermion interaction. Taking into account relative weakness of the magnetic dipole absorption, we propose a waveguide scheme for its experimental observation.

中文翻译：

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量子阱子带间跃迁处光的磁偶极子吸收

我们从理论上考虑了宽隙量子阱 (QW) 中子带间跃迁处红外光吸收的磁偶极子机制。与电偶极共振相反，所讨论的机制体现在与电磁辐射的 s 极化分量的相互作用中。我们证明了 a) 二维层中磁偶极子带间跃迁和电偶极子带间跃迁的频率在单粒子近似框架中相等；b) 集体等离子体效应应导致典型 QW 中磁偶极子共振和电偶极子共振之间的显着频移。这就是为什么磁偶极子谐振频率和电偶极子谐振频率的独立测量可以允许提取 QW 参数和集体费米子相互作用理论模型的实验验证。