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- W87153994 abstract "eld. At the same time, a strong non-local resistance appears which we describe by a model of helical and dissipative quantum Hall edge channels shorted by residual bulk conductivity. In an attempt to reduce the bulk conductivity, we have grown samples with slightly impure Gallium. Large-area devices show a peak resistance at the charge neutrality point enhanced by almost three orders of magnitude compared to the highmobility samples. A requirement for observing the topological insulator state is the fabrication of devices smaller than the inelastic scattering length. We have developed an optimized fabrication recipe by comparing samples produced with wet and dry etching. The former turns out to be favorable for obtaining smooth edge potentials and a width-independent electron density. With this fabrication technology we have produced small-area Hall bar devices with widths and contact separations in the micrometer range. Surprisingly these devices do not exhibit a resistance maximum at charge neutrality like large-area devices, but rather show a plateau-like local resistivity at negative gate voltages. At the same time the Hall density saturates in these devices at nite electronic densities instead of turning into the hole regime, and a systematic non-local resistance signal appears in all devices. We discuss these" @default.
- W87153994 created "2016-06-24" @default.
- W87153994 creator A5049741006 @default.
- W87153994 date "2015-03-03" @default.
- W87153994 modified "2023-09-23" @default.
- W87153994 title "Magnetotransport in the topological insulator candidate InAs/GaSb" @default.
- W87153994 hasPublicationYear "2015" @default.
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