Conductance fluctuations of chiral metals

✍ Scribed by D.P. Druist; Kyung-Hwa Yoo; P.J. Turley; E.G. Gwinn; K. Maranowski; A.C. Gossard

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 63 KB
• Volume: 25
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1998.0634

✦ Synopsis

We study conductance fluctuations of the edge-state sheath that forms in the integer quantum Hall effect from the coupled edge states of a GaAs/Al x Ga 1-x As multilayer. Comparison of the measured variance in the vertical conductance to recent theoretical predictions for mesoscopic fluctuations suggests dephasing lengths of 1-10 µm around the sheath perimeter at low temperatures. However, inconsistencies in the estimated inelastic lengths indicate that present understanding of dephasing on the sheath is incomplete.