Quantum Optics of Low-Dimensional Electrons in Layered Structures
A two-level atom of excitation energy E outside a metallic half-space can couple strongly to the surface plasmons if E/ħ is closely tuned to the limiting surface plasmon frequency of the metal1. This physical situation is the simplest ‘cavity QED’ problem2 in which entangled states (linear combinations of atomic states and single surface plasmonpolariton states) can be realised, but it is, in fact, more general than the example might suggest. In low dimensional structures3 the excitation energy E could belong to an impurity atom, or be associated with a quantum well (2D) or a quantum wire (1D). A quantum dot (0D) can be regarded as the macroscopic analogue of an atom. Whenever E matches any one of a number of possible modes supported by the layered structure the spectrum of the scattered light in a light scattering experiment should exhibit a doublet in the frequency region of the resonance.
KeywordsEntangle State Quantum Wire Interface Phonon Polariton State Reststrahl Band
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