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Title:
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Asymptotic analysis of the Gunn effect with realistic boundary conditions
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Author:
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Bonilla, L. L.; Rodríguez Cantalapiedra, Inma; Gomila Lluch, Gabriel; Rubí Capaceti, José Miguel
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Física Aplicada; Universitat Politècnica de Catalunya. NOLIN - Física No-Lineal i Sistemes Fora de l'Equilibri |
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Abstract:
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A general asymptotic analysis of the Gunn effect in n-type GaAs under general boundary conditions for
metal-semiconductor contacts is presented. Depending on the parameter values in the boundary condition of
the injecting contact, different types of waves mediate the Gunn effect. The periodic current oscillation typical
of the Gunn effect may be caused by moving charge-monopole accumulation or depletion layers, or by low- or
high-field charge-dipole solitary waves. A new instability caused by multiple shedding of ~low-field! dipole
waves is found. In all cases the shape of the current oscillation is described in detail: we show the direct
relationship between its major features ~maxima, minima, plateaus, etc.! and several critical currents ~which
depend on the values of the contact parameters!. Our results open the possibility of measuring contact parameters
from the analysis of the shape of the current oscillation |
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Abstract:
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Peer Reviewed |
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Subject(s):
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-Àrees temàtiques de la UPC::Física
-Condensed matter
-Statistical physics
-Boundary
-Matèria condesada
-Termodinàmica |
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Rights:
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Document type:
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Article - Published version
Article |
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Published by:
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The American Physical Society
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