Imaging of coulomb-driven quantum Hall edge states

Keji Lai, Worasom Kundhikanjana, Michael A. Kelly, Zhi Xun Shen, Javad Shabani, Mansour Shayegan

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Abstract

The edges of a two-dimensional electron gas (2DEG) in the quantum Hall effect (QHE) regime are divided into alternating metallic and insulating strips, with their widths determined by the energy gaps of the QHE states and the electrostatic Coulomb interaction. Local probing of these submicrometer features, however, is challenging due to the buried 2DEG structures. Using a newly developed microwave impedance microscope, we demonstrate the real-space conductivity mapping of the edge and bulk states. The sizes, positions, and field dependence of the edge strips around the sample perimeter agree quantitatively with the self-consistent electrostatic picture. The evolution of microwave images as a function of magnetic fields provides rich microscopic information around the ν=2 QHE state.

Original languageEnglish (US)
Article number176809
JournalPhysical review letters
Volume107
Issue number17
DOIs
StatePublished - Oct 19 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Lai, K., Kundhikanjana, W., Kelly, M. A., Shen, Z. X., Shabani, J., & Shayegan, M. (2011). Imaging of coulomb-driven quantum Hall edge states. Physical review letters, 107(17), [176809]. https://doi.org/10.1103/PhysRevLett.107.176809