Realization and Characterization of a Curved Two-dimensional Electron Gas

ORAL

Abstract

Using the built-in strain from lattice mismatch between Al$_{0.33}$Ga$_{0.67}$As and In$_{0.2}$Ga$_{0.8}$As as a bending force, a strip of two-dimensional electron gas (2DEG) in an Al$_{x}$Ga$_{1-x}$As/GaAs/Al$_{x}$Ga$_{1-x}$As heterostructure is curved into a tube when released from the substrate by wet etching. A variety of mesoscopic quantum devices can be defined in such curved 2DEG structures. This technology opens the door for investigating geometry-dependent electron transport under non-uniform magnetic fields. We have defined Hall bar patterns from a sheet of 2DEG using both optical and electron-beam lithography. The sample characterization under an external magnetic field will be discussed.

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Authors

  • Nakul Shaji

  • H. Qin

    • Department of Electrical and Computer Engineering, University of Wisconsin at Madison

  • Ryan Toonen

    • Department of Electrical and Computer Engineering, University of Wisconsin at Madison

  • Robert Blick

    • Department of Electrical and Computer Engineering, University of Wisconsin at Madison
    • Department of Electrical and Computer Engineering, University of Wisconsin-Madison

  • Christoph Deneke

  • Oliver Schmidt

    • Max-Plank-Institut fuer Festkoerperforschung, Stuttgart, Germany