Hot-electron spectrometry with quantum point contacts | Zendy

J. Williamson | Zendy; H. van Houten | Zendy; C. W. J. Beenakker | Zendy; M. Broekaart | Zendy; L. Spendeler | Zendy; B. J. van Wees | Zendy; C. T. Foxon | Zendy

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Hot-electron spectrometry with quantum point contacts

Author(s) -

J. Williamson,

H. van Houten,

C. W. J. Beenakker,

M. Broekaart,

L. Spendeler,

B. J. van Wees,

C. T. Foxon

Publication year - 1990

Publication title -

physical review. b, condensed matter

Language(s) - English

Resource type - Journals

eISSN - 1095-3795

pISSN - 0163-1829

DOI - 10.1103/physrevb.41.1207

Subject(s) - electron , atomic physics , physics , quantum point contact , heterojunction , kinetic energy , fermi gas , fermi energy , energy (signal processing) , condensed matter physics , electron spectrometer , ballistic conduction , spectrometer , quantum well , nuclear physics , quantum mechanics , cathode ray , laser

Ballistic transport of electrons over several micrometers with excess energy of up to the order of the Fermi energy has been observed in the two-dimensional electron gas of a GaAs-AlxGa1–xAs heterostructure. Quantum point contacts in an electron-focusing geometry have been used as a novel magnetic spectrometer to measure directly the kinetic energy of injected electrons. The observed energy gain is linear in the total applied voltage, and the slope allows a determination of the local voltage drop over the point contact.

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