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

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