Measurement of heavy-hole spin dephasing in (InGa)As quantum dots

Abstract

We measure the spin dephasing of holes localized in self-assembled (InGa)As quantum dots by spin noise spectroscopy. The localized holes show a distinct hyperfine interaction with the nuclear spin bath despite the p-type symmetry of the valence band states. The experiments reveal a short spin relaxation time τ_{fast}^{hh} of 27 ns and a second, long spin relaxation time τ_{slow}^{hh} which exceeds the latter by more than one order of magnitude. The two times are attributed to heavy hole spins aligned perpendicular and parallel to the stochastic nuclear magnetic field. Intensity dependent measurements and numerical simulations reveal that the long relaxation time is still obscured by light absorption, despite low laser intensity and large detuning. Off-resonant light absorption causes a suppression of the spin noise signal due to the creation of a second hole entailing a vanishing hole spin polarization.

accepted to be published in APL

References in corpus (4)

• Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
• Hole - Nuclear Spin Interaction in Quantum Dots
• Spin noise spectroscopy in GaAs (110) quantum wells: Access to intrinsic spin lifetimes and equilibrium electron dynamics
• Semiconductor Spin Noise Spectroscopy: Fundamentals, Accomplishments, and Challenges

Cited by in corpus (29)

• Nuclear spin physics in quantum dots: an optical investigation
• The Theory of Spin Noise Spectroscopy: A Review
• Intrinsic spin fluctuations reveal the dynamical response function of holes coupled to nuclear spin baths in (In,Ga)As quantum dots
• Optical Spin Noise of a Single Hole Spin Localized in an (InGa)As Quantum Dot
• Spin decoherence due to a randomly fluctuating spin bath
• Role of Nuclear Quadrupole Coupling on Decoherence and Relaxation of Central Spins in Quantum Dots
• Spin noise in quantum dot ensembles
• Coherence of a dynamically decoupled quantum-dot hole spin
• Spin-noise in the anisotropic central spin model
• Spin noise of exciton-polaritons in microcavities
• Spin noise of electrons and holes in (In,Ga)As quantum dots: experiment and theory
• Influcence of the nuclear electric quadrupolar interaction on the coherence time of hole- and electron-spins confined in semiconductor quantum dots
• Quantum Fingerprints in Higher Order Correlators of a Spin Qubit
• Spatiotemporal spin fluctuations caused by spin-orbit-coupled Brownian motion
• Temperature dependence of hole spin coherence in (In,Ga)As quantum dots measured by mode-locking and echo techniques
• Spin and reoccupation noise in a single quantum dot beyond the fluctuation-dissipation theorem
• Nonequilibrium spin noise in a quantum dot ensemble
• Effect of exchange interaction on the spin fluctuations of localized electrons
• Optical amplification of spin noise spectroscopy via homodyne detection
• Exciton spin noise in quantum wells
• Spin noise spectroscopy of donor bound electrons in ZnO
• Spin noise in a quantum dot ensemble: from a quantum mechanical to a semi-classical description
• Long-time coherence in fourth-order spin correlation functions
• Detection and amplification of spin noise using scattered laser light in a quantum-dot microcavity
• Relaxation of flying spin qubits in quantum wires by hyperfine interaction
• Maximizing the purity of a qubit evolving in an anisotropic environment
• Hole-capture competition between a single quantum dot and an ionized acceptor
• Fluctuations in Spin Dynamics Excited by Pulsed Light
• Spin-orbit-induced hole spin relaxation in a quantum dot molecule: the effect of $s$-$p$ coupling