Phonon-Induced Decay of the Electron Spin in Quantum Dots

By V. Golovach, A. Khaetskii, Daniel Loss. 2003

336 citations recorded by the source corpus.

We study spin relaxation and decoherence in a GaAs quantum dot due to spin-orbit (SO) interaction. We derive an effective Hamiltonian which couples the electron spin to phonons or any other fluctuation of the dot potential. We show that the spin decoherence time T-2 is as large as the spin relaxation time T-1, under realistic conditions. For the Dresselhaus and Rashba SO couplings, we find that, in leading order, the effective B field can have only fluctuations transverse to the applied B field. As a result, T-2=2T(1) for arbitrarily large Zeeman splittings, in contrast to the naively expected case T-2

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/0c1509a604814a516392e60ba9f52eee333ad401

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In Atomic and Molecular Physics, and Optics

In Electrical and Electronic Engineering

Citations in the corpus

Single-shot read-out of an individual electron spin in a quantum dot (2004, background): “More experiments are needed in order to test the theoretical prediction that relaxation at high magnetic fields is dominated by spin-orbit interactions [29, 30, 31], with smaller contributions resulting from hyperfine interactions with the nuclear”
Spin qubits in graphene quantum dots (2006, background): “In such devices, the major sources of spin decoherence have been identified as the spin-orbit interaction, coupling the spin to lattice vibrations [6, 7,8], and the hyperfine interaction of the electron spin with the surrounding nuclear spins [9, 10, 11, 12, 13, 14].”
Spins in few-electron quantum dots (2006, background): “Remarkably, in leading order in the spin-orbit interaction, there is no pure phase randomization of the electron spin, such that in fact T2 = 2T1 (Golovach et al., 2004).”
Optically programmable electron spin memory using semiconductor quantum dots (2004, background): “, thus protecting the ‘spin’ quantum information against decoherenc”
Decoherence in solid-state qubits (2008, background): “However, it turns out that, at first order perturbation theory in the spin-orbit interaction, no dephasing takes place [55].”