Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 39: Materials and devices for quantum technology II
HL 39.10: Talk
Wednesday, March 18, 2020, 12:30–12:45, POT 112
Incoherent effects in hot-electron quantum optics — •Lewis Clark1, Clarissa Barratt1, Masaya Kataoka2, and Clive Emary1 — 1Joint Quantum Centre Durham-Newcastle, School of Mathematics, Statistics and Physics, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom — 2National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom
Using dynamical quantum dot single electron pumps, high-energy (hot) single electrons may be injected into semiconductor systems both reliably and at a high rate. When combined with energy and time-resolved detection, electrons from these sources provide us with a new platform to probe fundamental semiconductor physics in unprecedented detail.
In this contribution, we discuss coupling single-electron sources into interferometer geometries, such as the Mach-Zehnder interferometer, where the visibility of the quantum interference acts as a sensitive probe of the properties both of the electrons and their environment. We investigate the effect of the uncertainty in injection energy on the phase contributions of the path lengths and quantum point contacts.
We also present theoretical calculations of the decay rate of a hot electron subject to phonon scattering, and determine how these rates are affected by parameters such as the injection energy and the magnetic field. Using our calculations for both phase averaging and phonon rates, we derive strategies for minimising the effects of these processes, thus maximising the quantum-coherent properties of the electrons.