title: Laser-induced quantum coherence in a semiconductor quantum well.
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.
authors.affiliation: Experimental Solid State Group, Physics Department, Imperial College, London, SW7 2BZ, United Kingdom.
authors.forename: G B
authors.initials: GB
authors.lastname: Serapiglia
authors.forename: E
authors.initials: E
authors.lastname: Paspalakis
authors.forename: C
authors.initials: C
authors.lastname: Sirtori
authors.forename: K L
authors.initials: KL
authors.lastname: Vodopyanov
authors.forename: C C
authors.initials: CC
authors.lastname: Phillips