Detecting THz current fluctuations in a quantum point contact using a nanowire quantum dot

Details Detecting THz current fluctuations in a quantum point contact using a nanowire quantum dot Detecting THz current fluctuations in a quantum point contact using a nanowire quantum dot

2008-05-09

arxiv.org/abs/0805.1341v1

Phys. Rev. B 78, 035324 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.78.035324

We use a nanowire quantum dot to probe high-frequency current fluctuations in a nearby quantum point contact. The fluctuations drive charge transitions in the quantum dot, which are measured in real-time with single-electron detection techniques. The quantum point contact (GaAs) and the quantum dot (InAs) are fabricated in different material systems, which indicates that the interactions are mediated by photons rather than phonons. The large energy scales of the nanowire quantum dot allow radiation detection in the long-wavelength infrared regime.

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