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HL: Fachverband Halbleiterphysik
HL 3: Quantum Dots and Wires: Transport
HL 3.1: Invited Talk
Monday, March 18, 2024, 09:30–10:00, EW 202
Unraveling spin dynamics from charge fluctuations — Eric Kleinherbers1,2 and •Jürgen König1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Germany — 2Department of Physics and Astronomy, University of California, Los Angeles, USA
The use of single electron spins in quantum dots as qubits requires detailed knowledge about the processes involved in their initialization and operation as well as their relaxation and decoherence. In optical schemes for such spin qubits, spin-flip Raman as well as Auger processes play an important role, in addition to environment-induced spin relaxation. In [1], we demonstrate how to quantitatively extract all these rates in one go from analyzing charge fluctuations of the quantum dot measured with resonance fluorescence [2]. For this, we employ the tools of waiting-time distributions and full counting statistics characterized by factorial cumulants and discuss the role of detector imperfections [3].
[1] E. Kleinherbers et al., Phys. Rev. Res. 5, 043102 (2023).
[2] A. Kurzmann et al., Phys. Rev. Lett. 122, 247403 (2019).
[3] E. Kleinherbers et al., Phys. Rev. Lett. 128, 087701 (2022).
Keywords: quantum dots; full counting statistics; resonance fluorescence; factorial cumulants; Auger processes