Spin and Orbital Spectroscopy in the Absence of Coulomb Blockade in Lead Telluride Nanowire Quantum Dots

Abstract

We investigate quantum dots in semiconductor PbTe nanowire devices. Due to the accessibility of ambipolar transport in PbTe, quantum dots can be occupied both with electrons and holes. Owing to a very large dielectric constant in PbTe of order 1000, we do not observe Coulomb blockade which typically obfuscates the orbital and spin spectra. We extract large and highly anisotropic effective Lande g-factors, in the range 20-44. The absence of Coulomb blockade allows direct readout, at zero source-drain bias, of spin-orbit hybridization energies of up to 600 microelectronvolt. These spin properties make PbTe nanowires, the recently synthesized members of group IV-VI materials family, attractive as a materials platform for quantum technology, such as spin and topological qubits.

arXiv commentFull transport data available via Zenodo at https://zenodo.org/communities/frolovlab/

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Cited by in corpus (8)

• Large even-odd spacing and $g$-factor anisotropy in PbTe quantum dots
• Ballistic PbTe Nanowire Devices
• Evidence for $\pi$-shifted Cooper quartets and few-mode transport in PbTe nanowire three-terminal Josephson junctions
• Expanded stability of layered SnSe-PbSe alloys and evidence of displacive phase transformation from rocksalt in heteroepitaxial thin films
• Reducing disorder in PbTe nanowires for Majorana research
• Anisotropy of PbTe nanowires with and without a superconductor
• Theory for electron and hole fine structure and Landé g-factors in lead chalcogenide nanowires
• Presence versus absence of charging energies in PbTe quantum dots