Evidence for localization and 0.7 anomaly in hole quantum point contacts

Y. Komijani, M. Csontos, I. Shorubalko, T. Ihn, K. Ensslin, Y. Meir, D. Reuter, A. D. Wieck

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Quantum point contacts (QPCs) implemented in p-type GaAs/AlGaAs heterostructures are investigated by low-temperature electrical conductance spectroscopy. Besides onedimensional conductance quantization, a pronounced extra plateau is found at about 0.7(2e2/h) which possesses the characteristic properties of the so-called "0.7 anomaly" known from experiments with n-type samples. The evolution of the 0.7 plateau in high perpendicular magnetic field reveals the existence of a quasi-localized state and is consistent with the explanation of the 0.7 anomaly based on self-consistent charge localization. These observations are robust when lateral electrical fields are applied which shift the relative position of the electron wave function in the QPC, testifying to the intrinsic nature of the underlying physics.

Original languageEnglish
Article number67010
JournalEurophysics Letters
Volume91
Issue number6
DOIs
StatePublished - 1 Sep 2010

Fingerprint

Dive into the research topics of 'Evidence for localization and 0.7 anomaly in hole quantum point contacts'. Together they form a unique fingerprint.

Cite this