Electron interferometer formed with a scanning probe tip and quantum point contact

Details Electron interferometer formed with a scanning probe tip and quantum point contact Electron interferometer formed with a scanning probe tip and quantum point contact

2010-09-19

arxiv.org/abs/1009.3671v1

Physical Review B 80, 041303(R) (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Text and supplementary information. Text: 4 pages, 4 figures. Supplementary information: 5 pages, 2 figures

Scientific paper

10.1103/PhysRevB.80.041303

We show an electron interferometer between a quantum point contact (QPC) and a scanning gate microscope (SGM) tip in a two-dimensional electron gas. The QPC and SGM tip act as reflective barriers of a lossy cavity; the conductance through the system thus varies as a function of the distance between the QPC and SGM tip. We characterize how temperature, electron wavelength, cavity length, and reflectivity of the QPC barrier affect the interferometer. We report checkerboard interference patterns near the QPC and, when injecting electrons above or below the Fermi energy, effects of dephasing.

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