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HL: Fachverband Halbleiterphysik

HL 3: Quantum Dots and Wires: Transport

HL 3.1: Hauptvortrag

Montag, 18. März 2024, 09:30–10:00, EW 202

Unraveling spin dynamics from charge fluctuations — Eric Kleinherbers^1,2 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