Tunable g factor and phonon-mediated hole spin relaxation in Ge/Si nanowire quantum dots

Abstract

We theoretically consider g factor and spin lifetimes of holes in a longitudinal Ge/Si core/shell nanowire quantum dot that is exposed to external magnetic and electric fields. For the ground states, we find a large anisotropy of the g factor which is highly tunable by applying electric fields. This tunability depends strongly on the direction of the electric field with respect to the magnetic field. We calculate the single-phonon hole spin relaxation times T1 for zero and small electric fields and propose an optimal setup in which very large T1 of the order of tens of milliseconds can be reached. Increasing the relative shell thickness or the longitudinal confinement length further prolongs T1. In the absence of electric fields, the dephasing vanishes and the decoherence time T2 is determined by T2 = 2 T1.

arXiv comment7 pages, 4 figures

References in corpus (30)

• Quantum Computation with Quantum Dots
• Spin-orbit qubit in a semiconductor nanowire
• Spin-flip transitions between Zeeman sublevels in semiconductor quantum dots
• Tunable Supercurrent Through Semiconductor Nanowires
• One-Dimensional Hole Gas in Germanium/Silicon Nanowire Heterostructures
• Circuit Quantum Electrodynamics with a Spin Qubit
• Phonon-induced decay of the electron spin in quantum dots
• Electric Dipole Induced Spin Resonance in Quantum Dots
• Double quantum dot with integrated charge sensor based on Ge/Si heterostructure nanowires
• Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
• Ge/Si nanowire mesoscopic Josephson junctions
• Spin relaxation and decoherence of holes in quantum dots
• Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot
• Spectroscopy of spin-orbit quantum bits in indium antimonide nanowires
• Electrical control of spin relaxation in a quantum dot
• Spin Relaxation in Ge/Si Core-Shell Nanowire Qubits
• Observation of extremely slow hole spin relaxation in self-assembled quantum dots
• Strong Spin-Orbit Interaction and Helical Hole States in Ge/Si Nanowires
• Spin dynamics in InAs-nanowire quantum-dots coupled to a transmission line
• Fast spin-orbit qubit in an indium antimonide nanowire
• Tunable spin-selective loading of a silicon spin qubit
• Hybrid superconductor-semiconductor devices made from self-assembled SiGe nanocrystals on silicon
• Field Tuning the G-Factor in InAs Nanowire Double Quantum Dots
• Strong and Tunable Spin-Orbit Coupling of One-Dimensional Holes in Ge/Si Core/Shell Nanowires
• Monolithic growth of ultra-thin Ge nanowires on Si(001)
• Single-shot measurement of triplet-singlet relaxation in a Si/SiGe double quantum dot
• Hybridization and spin decoherence in heavy-hole quantum dots
• Relaxation of hole spins in quantum dots via two-phonon processes
• Spin Decay in a Quantum Dot Coupled to a Quantum Point Contact
• Observation of spin-selective tunneling in SiGe nanocrystals

Cited by in corpus (53)

• The germanium quantum information route
• Fast two-qubit logic with holes in germanium
• Ultrafast Hole Spin Qubit with Gate-Tunable Spin-Orbit Switch
• Direct Rashba spin-orbit interaction in Si and Ge nanowires with different growth directions
• Circuit QED with Hole-Spin Qubits in Ge/Si Nanowire Quantum Dots
• Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits
• Hole Spin Coherence in a Ge/Si Heterostructure Nanowire
• Hole spin qubits in Si FinFETs with fully tunable spin-orbit coupling and sweet spots for charge noise
• Squeezed hole spin qubits in Ge quantum dots with ultrafast gates at low power
• Strong spin-orbit interaction and $g$-factor renormalization of hole spins in Ge/Si nanowire quantum dots
• Majorana Fermions in Ge/Si Hole Nanowires
• Recent advances in hole-spin qubits
• Electric-field dependent g-factor anisotropy in Ge-Si core-shell nanowire quantum dots
• Single-shot readout of hole spins in Ge
• Phonon-Mediated Decay of Singlet-Triplet Qubits in Double Quantum Dots
• Magnetic Field Evolution of Spin Blockade in Ge/Si Nanowire Double Quantum Dots
• Anisotropic Pauli spin blockade in hole quantum dots
• A natural heavy-hole flopping mode qubit in germanium
• Single, double, and triple quantum dots in Ge/Si nanowires
• Spin blockade as a probe of Zeeman interactions in hole quantum dots
• Spin-orbit interaction and induced superconductivity in an one-dimensional hole gas
• Anisotropic g-Factor and Spin-Orbit Field in a Ge Hut Wire Double Quantum Dot
• Gate-Tunable Spin-Orbit Coupling in a Germanium Hole Double Quantum Dot
• Hard superconducting gap and diffusion-induced superconductors in Ge-Si nanowires
• Josephson effect in a few-hole quantum dot
• Superconducting grid-bus surface code architecture for hole-spin qubits
• Hole spin qubits in thin curved quantum wells
• Acoustic phonons and strain in core/shell nanowires
• Hole-phonon interactions in quantum dots: Effects of phonon confinement and encapsulation materials on spin-orbit qubits
• Cavity Control over Heavy-Hole Spin Qubits in Inversion-Symmetric Crystals
• Gate defined wires in HgTe quantum wells: from Majorana fermions to spintronics
• Exchange interaction of hole-spin qubits in double quantum dots in highly anisotropic semiconductors
• Ballistic quantum transport through Ge/Si core/shell nanowires
• Phonon-assisted relaxation and decoherence of singlet-triplet qubits in Si/SiGe quantum dots
• Renormalization of quantum dot $g$-factor in superconducting Rashba nanowires
• Electrical control of the hole spin qubit in Si and Ge nanowire quantum dots
• Electrical operation of hole spin qubits in planar MOS silicon quantum dots
• Modelling of spin decoherence in a Si hole qubit perturbed by a single charge fluctuator
• A Multiscale Simulation Approach for Germanium-Hole-Based Quantum Processor
• Strongly Interacting Holes in Ge/Si Nanowires
• Microscopic analysis of proximity-induced superconductivity and metallization effects in superconductor-germanium hole nanowires
• Charge-sensing of a Ge/Si core/shell nanowire double quantum dot using a high-impedance superconducting resonator
• Low-energy subband wave-functions and effective $g$-factor of one-dimensional hole gas
• Low-energy hole subband dispersions in a cylindrical Ge nanowire: the effects of the nanowire growth direction
• Electrical manipulation of a hole `spin'-orbit qubit in nanowire quantum dot: the nontrivial magnetic field effects
• Hidden anisotropy controls spin-photon entanglement in a charged quantum dot
• Magnetic-field dependence of spin-phonon relaxation and dephasing due to g-factor fluctuations from first principles
• Hole subband dispersions and strong `spin'-orbit coupling in a cylindrical Ge nanowire
• Majorana Fermions in Semiconducting Nanowires on the Top of Fulde-Ferrell Superconductor
• Acoustic phonons, spin-phonon coupling and spin relaxation via the lattice reorientation mechanism in hexagonal germanium nanowires
• Disentangling orbital and confinement contributions to $g$-factor in Ge/SiGe hole quantum dots
• Spin qubit shuttling between coupled quantum dots with inhomogeneous Landé g-tensors
• Anomalous zero-field splitting for hole spin qubits in Si and Ge quantum dots