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

Publication ,  Journal Article
Wu, PM; Li, P; Zhang, H; Chang, AM
Published in: Physical Review B - Condensed Matter and Materials Physics
February 10, 2012

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.

Duke Scholars

Published In

Physical Review B - Condensed Matter and Materials Physics

DOI

EISSN

1550-235X

ISSN

1098-0121

Publication Date

February 10, 2012

Volume

85

Issue

8

Related Subject Headings

  • Fluids & Plasmas
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences
 

Citation

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Wu, P. M., Li, P., Zhang, H., & Chang, A. M. (2012). Evidence for the formation of quasibound states in an asymmetrical quantum point contact. Physical Review B - Condensed Matter and Materials Physics, 85(8). https://doi.org/10.1103/PhysRevB.85.085305
Wu, P. M., P. Li, H. Zhang, and A. M. Chang. “Evidence for the formation of quasibound states in an asymmetrical quantum point contact.” Physical Review B - Condensed Matter and Materials Physics 85, no. 8 (February 10, 2012). https://doi.org/10.1103/PhysRevB.85.085305.
Wu PM, Li P, Zhang H, Chang AM. Evidence for the formation of quasibound states in an asymmetrical quantum point contact. Physical Review B - Condensed Matter and Materials Physics. 2012 Feb 10;85(8).
Wu, P. M., et al. “Evidence for the formation of quasibound states in an asymmetrical quantum point contact.” Physical Review B - Condensed Matter and Materials Physics, vol. 85, no. 8, Feb. 2012. Scopus, doi:10.1103/PhysRevB.85.085305.
Wu PM, Li P, Zhang H, Chang AM. Evidence for the formation of quasibound states in an asymmetrical quantum point contact. Physical Review B - Condensed Matter and Materials Physics. 2012 Feb 10;85(8).

Published In

Physical Review B - Condensed Matter and Materials Physics

DOI

EISSN

1550-235X

ISSN

1098-0121

Publication Date

February 10, 2012

Volume

85

Issue

8

Related Subject Headings

  • Fluids & Plasmas
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences