Current focusing in InSb heterostructures

We report transverse electron focusing in a symmetrically doped, InSb-based two-dimensional electron system. In a focusing device, the application of a perpendicular magnetic field steers the electron current from an injecting quantum point contact into a collector quantum point contact whenever the...

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Published inPhysica. E, Low-dimensional systems & nanostructures Vol. 34; no. 1; pp. 647 - 650
Main Authors Dedigama, A.R., Deen, D., Murphy, S.Q., Goel, N., Keay, J.C., Santos, M.B., Suzuki, K., Miyashita, S., Hirayama, Y.
Format Journal Article Conference Proceeding
LanguageEnglish
Published Amsterdam Elsevier B.V 01.08.2006
Elsevier
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Summary:We report transverse electron focusing in a symmetrically doped, InSb-based two-dimensional electron system. In a focusing device, the application of a perpendicular magnetic field steers the electron current from an injecting quantum point contact into a collector quantum point contact whenever the diameter of the cyclotron orbit corresponds to an integer fraction of the injector to collector spatial separation. In low-temperature measurements of in-plane gated devices, we observe peaks in the collector voltage at magnetic fields where focusing is expected. The first peak displays substructure which is preserved at temperatures as high as 10 K and under a variety of gating conditions. We speculate that this substructure originates from spatially distinct paths for electrons with different spin polarizations arising from the large Dresselhaus effect expected for InSb-based electron systems.
ISSN:1386-9477
1873-1759
DOI:10.1016/j.physe.2006.03.050