Momentum dependence of the dimensionality of the electronic states in heterostructures |
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Authors: | V V Kapaev Yu V Kopaev |
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Institution: | (1) P. N. Lebedev Physics Institute, Russian Academy of Sciences, 117924 Moscow, Russia |
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Abstract: | Bound states of electrons (holes) in quantum wells and wires with asymmetric barriers can exist in bounded regions of two-and
one-dimensional momentum space, respectively. As the corresponding momentum increases, both the disappearance (increase of
dimensionality) and appearance (decrease of dimensionality) of bound states as well as the existence of a sequence of several
such transformations of dimensionality are possible. In the case of anisotropic effective masses in the quantum wells and
barriers, the forms of the lines of disappearance and appearance of bound states are different from the forms of the isoenergy
lines. Therefore there is a finite energy interval (i.e., electron density interval) where bound states exist on only a part
of an isoenergy line. The dimensionality of the states can be controlled with an electric field; this should be observable
in a number of the experiments discussed.
Pis’ma Zh. éksp. Teor. Fiz. 65, No. 2, 188–193 (25 January 1997) |
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Keywords: | |
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