Imaging of coulomb-driven quantum Hall edge states

TY - JOUR

T1 - Imaging of coulomb-driven quantum Hall edge states

AU - Lai, Keji

AU - Kundhikanjana, Worasom

AU - Kelly, Michael A.

AU - Shen, Zhi Xun

AU - Shabani, Javad

AU - Shayegan, Mansour

PY - 2011/10/19

Y1 - 2011/10/19

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/80054734905

UR - https://www.scopus.com/pages/publications/80054734905#tab=citedBy

U2 - 10.1103/PhysRevLett.107.176809

DO - 10.1103/PhysRevLett.107.176809

M3 - Article

C2 - 22107561

SN - 0031-9007

VL - 107

JO - Physical review letters

JF - Physical review letters

IS - 17

M1 - 176809

ER -