Resonantly Enhanced Nonlinear Conductance in Long Quantum Point Contacts near Pinch-Off

T. Morimoto, M. Henmi, R. Naito, K. Tsubaki, N. Aoki, J. P. Bird, and Y. Ochiai

Phys. Rev. Lett. 97, 096801 – Published 1 September 2006

Abstract

We report on a remarkable resonance in the differential conductance of long quantum point contacts (QPCs) that is observed as a precursor to regular quantized transport. This effect is increasingly pronounced in longer QPCs, in which the differential conductance may resonantly exceed $2 e^{2} / h$ . From a study of the experimental characteristics of this feature, we suggest that it may be associated with the formation of a well-resolved energy gap that opens dynamically as a result of enhanced many-body interactions in long QPCs.

Received 17 November 2005

DOI:https://doi.org/10.1103/PhysRevLett.97.096801

Authors & Affiliations

T. Morimoto¹, M. Henmi¹, R. Naito¹, K. Tsubaki¹, N. Aoki^1,2, J. P. Bird³, and Y. Ochiai^1,2

¹Graduate School of Science and Technology, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
²Department of Electronics and Mechanical Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
³Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260-1920, USA

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Issue

Vol. 97, Iss. 9 — 1 September 2006

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