Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-08-19
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Text 18 pages in Latex/Revtex format, 7 Postscript figures
Scientific paper
10.1103/PhysRevB.60.11030
We study theoretically the effect of an electric field on the electron states and far-infrared optical properties in narrow-gap lead salt quantum wells. The electron states are described by a two-band Hamiltonian. An application of a strong electric field across the well allows the control of the energy gap between the two-dimensional (2D) states in a wide range. A sufficiently strong electric field transforms the narrow-gap quantum well to a nearly gapless 2D system, whose electron energy spectrum is described by linear dispersion relations \epsilon_{\sigma} (k) ~\pm (k-k_{\sigma}), where k_{\sigma} are the field-dependent 2D momenta corresponding to the minimum energy gaps for the states with spin numbers \sigma. Due to the field-induced shift of the 2D subband extrema away from k=0 the density of states has inverse-square-root divergencies at the edges. This property may result in a considerable increase of the magnitude of the optical absorption and in the efficiency of the electrooptical effect.
Raichev O. E.
Vasilopoulos P.
Vasko Fedir T.
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