Engineering ultralong spin coherence in two-dimensional hole systems at low temperatures

Abstract

For the realisation of scalable solid-state quantum-bit systems, spins in semiconductor quantum dots are promising candidates. A key requirement for quantum logic operations is a sufficiently long coherence time of the spin system. Recently, hole spins in III-V-based quantum dots were discussed as alternatives to electron spins, since the hole spin, in contrast to the electron spin, is not affected by contact hyperfine interaction with the nuclear spins. Here, we report a breakthrough in the spin coherence times of hole ensembles, confined in so called natural quantum dots, in narrow GaAs/AlGaAs quantum wells at temperatures below 500 mK. Consistently, time-resolved Faraday rotation and resonant spin amplification techniques deliver hole-spin coherence times, which approach in the low magnetic field limit values above 70 ns. The optical initialisation of the hole spin polarisation, as well as the interconnected electron and hole spin dynamics in our samples are well reproduced using a rate equation model.

16 pages, 6 figures

References in corpus (10)

• Spin qubits in graphene quantum dots
• 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
• Hole - Nuclear Spin Interaction in Quantum Dots
• Universal behavior of the electron g-factor in GaAs/AlGaAs quantum wells
• Optical orientation of electron spins in GaAs quantum wells
• Effect of initial spin polarization on spin dephasing and electron g factor in a high-mobility two-dimensional electron system
• Spin coherence of holes in GaAs/AlGaAs quantum wells
• Hole spin relaxation in semiconductor quantum dots
• Detection of large magneto-anisotropy of electron spin dephasing in a high-mobility two-dimensional electron system in a $[001]$ GaAs/AlGaAs quantum well

Cited by in corpus (24)

• Spin dynamics in semiconductors
• Semiconductor Spin Noise Spectroscopy: Fundamentals, Accomplishments, and Challenges
• Recent advances in hole-spin qubits
• Coherent spin dynamics of electrons and excitons in nanostructures
• Coherent spin dynamics of electrons and holes in semiconductor quantum wells and quantum dots under periodical optical excitation: resonant spin amplification versus spin mode-locking
• Strong influence of spin-orbit coupling on magnetotransport in two-dimensional hole systems
• Anisotropic spin relaxation revealed by resonant spin amplification in (110) GaAs quantum wells
• Spin-echo dynamics of a heavy hole in a quantum dot
• Decoherence-assisted initialization of a resident hole spin polarization in a two-dimensional hole gas
• Generation and detection of mode-locked spin coherence in (In,Ga)As/GaAs quantum dots by laser pulses of long duration
• Hole spin dynamics and hole $g$ factor anisotropy in coupled quantum well systems
• Conserved Spin Quantity in Strained Hole Systems with Rashba and Dresselhaus Spin-Orbit Coupling
• Terahertz magneto-optical spectroscopy of two-dimensional hole and electron systems
• Signatures of quantum mechanical Zeeman effect in classical transport due to topological properties of two-dimensional spin-3/2 holes
• Optical polarization of localized hole spins in p-doped quantum wells
• Dynamic Structure Factor of Normal Fermi Gas from Collisionless to Hydrodynamic Regime
• Single beam detection of optically driven spin dynamics in CdTe/(Cd,Mg)Te quantum wells
• Asymmetric $g$ tensor in low-symmetry two-dimensional hole systems
• Tuning of Fermi Contour Anisotropy in GaAs (001) 2D Holes via Strain
• Optical initialization of hole spins in p-doped quantum dots: orientation efficiency and loss of coherence
• Electron spin orientation under in-plane optical excitation in GaAs quantum wells
• Spin dynamics in p-doped semiconductor nanostructures subject to a magnetic field tilted from the Voigt geometry
• Spin dynamics and magneto-optical response in charge-neutral tunnel-coupled quantum dots
• RKKY interaction in Mn-doped 4 $\times$ 4 Luttinger systems