Heavy hole states in Germanium hut wires

Abstract

Hole spins have gained considerable interest in the past few years due to their potential for fast electrically controlled qubits. Here, we study holes confined in Ge hut wires, a so far unexplored type of nanostructure. Low temperature magnetotransport measurements reveal a large anisotropy between the in-plane and out-of-plane g-factors of up to 18. Numerical simulations verify that this large anisotropy originates from a confined wave function which is of heavy hole character. A light hole admixture of less than 1% is estimated for the states of lowest energy, leading to a surprisingly large reduction of the out-of-plane g-factors. However, this tiny light hole contribution does not influence the spin lifetimes, which are expected to be very long, even in non isotopically purified samples.

References in corpus (8)

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• On the nature of tunable hole g-factors in quantum dots
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Cited by in corpus (21)

• Recent advances in hole-spin qubits
• Simple model for electrical hole spin manipulation in semiconductor quantum dots: Impact of dot material and orientation
• Gate-Tunable Spin-Orbit Coupling in a Germanium Hole Double Quantum Dot
• Electrical operation of planar Ge hole spin qubits in an in-plane magnetic field
• Impact of interface traps on charge noise, mobility and percolation density in Ge/SiGe heterostructures
• Hole spin qubits in thin curved quantum wells
• Planar Josephson junctions in germanium: Effect of cubic spin-orbit interaction
• Progress in superconductor-semiconductor topological Josephson junctions
• Majorana zero modes in gate-defined germanium hole nanowires
• Majorana bound states in germanium Josephson junctions via phase control
• Fast Hole Tunneling Times in Germanium Hut Wires Probed by Single-Shot Reflectometry
• Electrical operation of hole spin qubits in planar MOS silicon quantum dots
• Anisotropic $g$-tensors in hole quantum dots: The role of the transverse confinement direction
• Non-linear anomalous Hall effect of two-dimensional spin-3/2 heavy holes
• Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits
• Dephasing of planar Ge hole spin qubits due to 1/$\text{f}$ charge noise
• Probing details of spin--orbit coupling through Pauli spin blockade
• Quantification of the heavy-hole--light-hole mixing in two-dimensional hole gases
• Hole spin splitting in a Ge quantum dot with finite barriers
• Hole subband dispersions and strong `spin'-orbit coupling in a cylindrical Ge nanowire
• Fully tunable hyperfine interactions of hole spin qubits in Si and Ge quantum dots