Electron transport in Al_xGa_1−xAs δ-MIGFETs: Conductivity enhancement induced by magnetic field effects

Highlights

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We study the transport properties of delta-MIGFETs in Al_xGa_1-xAs under the influence of a magnetic field.

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We show that the transport properties can be improved substantially by increasing the magnetic field strength.

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The mobility and conductivity can be enhanced 26% and 32%, respectively.

Abstract

The electronic structure and the transport phenomena of δ-MIGFETs have been studied in an Al_xGa_1−xAs host matrix. The subband structure and mobility calculations were performed within the effective mass approximation and relative mobility formula, respectively. Both the electronic structure and the transport properties are calculated as dependent on the applied magnetic field (B), the aluminum molar fraction (x) and the contact voltage in one of the gates (V_C1). It was found that the mobility and conductivity are enhanced by increasing the magnetic field for appropriate aluminum molar fraction and contact voltage. In particular, the mobility (conductivity) is improved almost 26% (32%) for V_C1 = 900 meV (850 meV), x = 0.2, and B = 20 T.