Laser-induced quantum coherence in a semiconductor quantum well |
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Authors: | Serapiglia G B Paspalakis E Sirtori C Vodopyanov K L Phillips C C |
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Institution: | Experimental Solid State Group, Physics Department, Imperial College, London, SW7 2BZ, United Kingdom. |
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Abstract: | The phenomenon of electromagnetically induced quantum coherence is demonstrated between three confined electron subband levels in a quantum well which are almost equally spaced in energy. Applying a strong coupling field, two-photon resonant with the 1-3 intersubband transition, produces a pronounced narrow transparency feature in the 1-2 absorption line. This result can be understood in terms of all three states being simultaneously driven into "phase-locked" quantum coherence by a single coupling field. We describe the effect theoretically with a density matrix method and an adapted linear response theory. |
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