Nonlinear conductance of quantum point contacts | Zendy

Leo P. Kouwenhoven | Zendy; B. J. van Wees | Zendy; C. J. P. M. Harmans | Zendy; J. Williamson | Zendy; H. van Houten | Zendy; C. W. J. Beenakker | Zendy; C. T. Foxon | Zendy; J. J. Harris | Zendy

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Nonlinear conductance of quantum point contacts

Author(s) -

Leo P. Kouwenhoven,

B. J. van Wees,

C. J. P. M. Harmans,

J. Williamson,

H. van Houten,

C. W. J. Beenakker,

C. T. Foxon,

J. J. Harris

Publication year - 1989

Publication title -

physical review. b, condensed matter

Language(s) - English

Resource type - Journals

eISSN - 1095-3795

pISSN - 0163-1829

DOI - 10.1103/physrevb.39.8040

Subject(s) - conductance , conductance quantum , physics , quantization (signal processing) , condensed matter physics , fermi gas , nonlinear system , ballistic conduction , quantum , electron , quantum point contact , quantum mechanics , quantum well , mathematics , laser , algorithm

The conductance of ballistic quantum constrictions in a two-dimensional electron gas has been studied experimentally as a function of the applied voltage. Large nonlinearities are found in the current-voltage characteristics. We give a simple model, which explains the main features of the nonlinear conductance. Breakdown of the conductance quantization occurs when the number of occupied one-dimensional sub bands becomes unequal for the two velocity directions. A critical voltage is found for the breakdown, which is equal to the subband separation at the Fermi level.

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