Zero field splitting of heavy-hole states in quantum dots

Abstract

Using inelastic cotunneling spectroscopy, we observe a 55μeV zero field splitting in the spin triplet manifold of Ge hut wire quantum dots. The degeneracy of the heavy hole triplet state is lifted since the interplay of strong spin orbit coupling and strong confinement leads to a preferred direction of the heavy-hole pseudospin. The reported effect should be observable in a broad class of strongly confined hole quantum-dot systems and needs to be considered when operating hole spin qubits.

References in corpus (25)

• Spins in few-electron quantum dots
• A CMOS silicon spin qubit
• Electric Dipole Induced Spin Resonance in Quantum Dots
• Fast two-qubit logic with holes in germanium
• Electron Cotunneling in a Semiconductor Quantum Dot
• Ge hole spin qubit
• Strong Spin-Orbit Interaction and Helical Hole States in Ge/Si Nanowires
• A single-hole spin qubit
• Hybrid superconductor-semiconductor devices made from self-assembled SiGe nanocrystals on silicon
• Electrical spin driving by $g$-matrix modulation in spin-orbit qubits
• Gate-reflectometry dispersive readout and coherent control of a spin qubit in silicon
• Measurements of Kondo and spin splitting in single-electron transistors
• Direct Rashba spin-orbit interaction in Si and Ge nanowires with different growth directions
• Cancellation of Spin-Orbit Effects in Quantum Gates Based on the Exchange Coupling in 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)
• Spintronic magnetic anisotropy
• Heavy hole states in Germanium hut wires
• Quantum Engineering of Spin and Anisotropy in Magnetic Molecular Junctions
• Anisotropic Spin Exchange in Pulsed Quantum Gates
• Self-controlled growth of highly uniform Ge/Si hut wires for scalable qubit devices
• Single-shot readout of hole spins in Ge
• Strong influence of spin-orbit coupling on magnetotransport in two-dimensional hole systems
• Observation of spin-selective tunneling in SiGe nanocrystals
• Controllable anisotropic exchange coupling between spin qubits in quantum dots

Cited by in corpus (9)

• Ultrafast coherent control of a hole spin qubit in a germanium quantum dot
• Two-qubit logic with anisotropic exchange in a fin field-effect transistor
• Microwave spectroscopy of interacting Andreev spins
• Phase driving hole spin qubits
• Determination of spin-orbit interaction in semiconductor nanostructures via non-linear transport
• Electrical operation of hole spin qubits in planar MOS silicon quantum dots
• Effect of disorder and strain on the operation of planar Ge hole spin qubits
• Anomalous zero-field splitting for hole spin qubits in Si and Ge quantum dots
• Kramers-protected hardware-efficient error correction with Andreev spin qubits