Edge State Propagation Direction in the Fractional Quantum Hall Regime: Multi-Terminal Magnetocapacitance Experiment

Conference · Mon Sep 20 00:00:00 EDT 1999

OSTI ID:13079

JOHNSON, B L; MOON, JEONG-SUN; RENO, JOHN L; SIMMONS, JERRY A

The propagation direction of fractional quantum Hall effect (FQHE) edge states has been investigated experimentally via the symmetry properties of the multi-terminal capacitances of a two dimensional electron gas. Although strong asymmetries with respect to zero magnetic field appear, no asymmetries with respect to even denominator Landau level filling factor {nu} are seen. This indicates that current-carrying FQHE edge states propagate in the same direction as integer QHE edge states. In addition, anomalous capacitance features, indicative of enhanced bulk conduction, are observed at {nu} = 1/2 and 3/2.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 13079
• Report Number(s): SAND99-2151C; TRN: US0110726
• Resource Relation: Conference: 13th International Conference on the Electronic Properties of Two-Dimensional Systems, Ottawa, Ontario (CA), 08/01/1999--08/06/1999; Other Information: PBD: 20 Sep 1999
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CAPACITANCE
ELECTRON GAS
HALL EFFECT
MAGNETIC FIELDS
ASYMMETRY
ENERGY LEVELS
ELECTRIC CONDUCTIVITY
EDGE STATES
INTEGER AND FRACTIONAL QUANTUM HALL EFFECT