Abstract
Linear light absorption of 2D electrons confined within a biased quantum well is studied theoretically. We demonstrate that for light polarization perpendicular to the 2D plane, in addition to conventional absorption peak at frequency ℏ ω ≈ Δ , where Δ is the intersubband energy distance, there exists a peak around a double frequency ℏ ω ≈ 2 Δ . This additional peak is entirely due to electron–electron interactions, and corresponds to excitation of two electrons by one photon. The magnitude of two-electron absorption is proportional to U 2 , where U is the applied bias.
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