Evidence for the formation of quasibound states in an asymmetrical quantum point contact


Journal Article

Features below the first conductance plateau in ballistic quantum point contacts (QPCs) are often ascribed to electron interaction and spin effects within the single mode limit. In QPCs with a highly asymmetric geometry, we observe sharp resonance peaks when the point contacts are gated to the single mode regime, and surprisingly, under certain gating conditions, a complete destruction of the 2e2/h first quantum plateau. The temperature evolution of the resonances suggest non-Fermi-liquid behavior, while the overall nonlinear characterizations reveal features reminiscent of the 0.7 effect. We attribute these unusual behaviors to the formation of a quasibound state, which is stabilized by a momentum mismatch accentuated by asymmetry. © 2012 American Physical Society.

Full Text

Duke Authors

Cited Authors

  • Wu, PM; Li, P; Zhang, H; Chang, AM

Published Date

  • February 10, 2012

Published In

Volume / Issue

  • 85 / 8

Electronic International Standard Serial Number (EISSN)

  • 1550-235X

International Standard Serial Number (ISSN)

  • 1098-0121

Digital Object Identifier (DOI)

  • 10.1103/PhysRevB.85.085305

Citation Source

  • Scopus