Intrinsic spin fluctuations reveal the dynamical response function of holes coupled to nuclear spin baths in (In,Ga)As quantum dots

Abstract

The problem of how single "central" spins interact with a nuclear spin bath is essential for understanding decoherence and relaxation in many quantum systems, yet is highly nontrivial owing to the many-body couplings involved. Different models yield widely varying timescales and dynamical responses (exponential, power-law, Gaussian, etc). Here we detect the small random fluctuations of central spins in thermal equilibrium (holes in singly-charged (In,Ga)As quantum dots) to reveal the timescales and functional form of bath-induced spin relaxation. This spin noise indicates long (400 ns) spin correlation times at zero magnetic field, that increase to $\sim$5 $\mu$s as hole-nuclear coupling is suppressed with small (100 G) applied fields. Concomitantly, the noise lineshape evolves from Lorentzian to power-law, indicating a crossover from exponential to inverse-log dynamics.

4 pages & 4 figures, + 8 pages supplemental material

References in corpus (10)

• Hyperfine interaction in a quantum dot: Non-Markovian electron spin dynamics
• Theory of electron spin decoherence by interacting nuclear spins in a quantum dot
• Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
• Observation of extremely slow hole spin relaxation in self-assembled quantum dots
• Electron Spin Dephasing due to Hyperfine Interactions with a Nuclear Spin Bath
• Hole - Nuclear Spin Interaction in Quantum Dots
• Direct measurement of the hole-nuclear spin interaction in single quantum dots
• Semiclassical dynamics and long time asymptotics of the central-spin problem in a quantum dot
• Hybridization and spin decoherence in heavy-hole quantum dots
• Measurement of heavy-hole spin dephasing in (InGa)As quantum dots

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• Measurements of spin properties of atomic systems in and out of equilibrium via noise spectroscopy
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• Exciton spin noise in quantum wells
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• All electrically controlled quantum gates for single heavy hole spin qubits
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• Quantum Sensing of Spin Fluctuations of Magnetic Insulator Films with Perpendicular Anisotropy
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• Probing Conformal Invariant of Non-unitary Two-Dimensional Systems by Central Spin Decoherence
• Maximizing the purity of a qubit evolving in an anisotropic environment
• Evolution of the inhomogeneously-broadened spin noise spectrum with ac drive
• Cross-correlation spectra in interacting quantum dot systems
• Fourth-order spin correlation function in the extended central spin model
• Hybrid Spin Noise Spectroscopy and the Spin Hall Effect
• Spin Correlations in Quantum Wires
• Dissipative evolution of a two-level system through a geometry-based classical mapping
• Spin excitations in systems with hopping electron transport and strong position disorder in a large magnetic field
• Single-shot measurement of transient nuclear magnetization with spin-noise spectroscopy in n-GaAs microcavities