Ballistic one-dimensional holes with strong g-factor anisotropy in germanium

Abstract

We report experimental evidence of ballistic hole transport in one-dimensional quantum wires gate-defined in a strained SiGe/Ge/SiGe quantum well. At zero magnetic field, we observe conductance plateaus at integer multiples of 2e^2/h. At finite magnetic field, the splitting of these plateaus by Zeeman effect reveals largely anisotropic g-factors, with absolute values below 1 in the quantum-well plane, and exceeding 10 out of plane. This g-factor anisotropy is consistent with a heavy-hole character of the propagating valence-band states, in line with a predominant confinement in the growth direction. Remarkably, we observe quantized ballistic conductance in device channels up to 600 nm long. These findings mark an important step towards the realization of novel devices for applications in quantum spintronics.

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Cited by in corpus (22)

• The germanium quantum information route
• A single-hole spin qubit
• Low disordered, stable, and shallow germanium quantum wells: a playground for spin and hybrid quantum technology
• Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits
• Germanium quantum well Josephson field effect transistors and interferometers
• Topologically non-trivial valley states in bilayer graphene quantum point contacts
• Lightly-strained germanium quantum wells with hole mobility exceeding one million
• Ballistic supercurrent discretization and micrometer-long Josephson coupling in germanium
• Electrical operation of planar Ge hole spin qubits in an in-plane magnetic field
• Single and Double Hole Quantum Dots in Strained Ge/SiGe Quantum Wells
• Majorana zero modes in gate-defined germanium hole nanowires
• Majorana bound states in germanium Josephson junctions via phase control
• Electrical operation of hole spin qubits in planar MOS silicon quantum dots
• Physics of Arbitrary Doped Kondo Lattices: from a Commensurate Insulator to a Heavy Luttinger Liquid and a Protected Helical Metal
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• Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits
• Effective out-of-plane g-factor in strained-Ge/SiGe quantum dots
• Dephasing of planar Ge hole spin qubits due to 1/$\text{f}$ charge noise
• Transport in Magnetically Doped One-Dimensional Wires: Can the Helical Protection Emerge without the Global Helicity?
• Effect of disorder and strain on the operation of planar Ge hole spin qubits
• Spin-valley 0.7 anomaly in bilayer graphene/WSe${}_2$ quantum point contacts
• Protected helical transport in magnetically doped quantum wires: Beyond the one-dimensional paradigm