Formation of long single quantum dots in high quality InSb nanowires grown by molecular beam epitaxy

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

We report on realization and transport spectroscopy study of single quantum dots (QDs) made from InSb nanowires grown by molecular beam epitaxy (MBE). The nanowires employed are 50-80 nm in diameter and the QDs are defined in the nanowires between the source and drain contacts on a Si/SiO2 substrate. We show that highly tunable QD devices can be realized with the MBE-grown InSb nanowires and the gate-to-dot capacitance extracted in the many-electron regimes is scaled linearly with the longitudinal dot size, demonstrating that the devices are of single InSb nanowire QDs even with a longitudinal size of similar to 700 nm. In the few-electron regime, the quantum levels in the QDs are resolved and the Lande g-factors extracted for the quantum levels from the magnetotransport measurements are found to be strongly level-dependent and fluctuated in a range of 18-48. A spin-orbit coupling strength is extracted from the magnetic field evolutions of a ground state and its neighboring excited state in an InSb nanowire QD and is on the order of similar to 300 mu eV. Our results establish that the MBE-grown InSb nanowires are of high crystal quality and are promising for the use in constructing novel quantum devices, such as entangled spin qubits, one-dimensional Wigner crystals and topological quantum computing devices.

Detaljer

Författare
  • Dingxun Fan
  • Sen Li
  • N. Kang
  • Philippe Caroff
  • L. B. Wang
  • Y. Q. Huang
  • Mingtang Deng
  • Chunlin Yu
  • Hongqi Xu
Enheter & grupper
Externa organisationer
  • Peking University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Nanoteknik
Originalspråkengelska
Sidor (från-till)14822-14828
TidskriftNanoscale
Volym7
Utgivningsnummer36
StatusPublished - 2015
PublikationskategoriForskning
Peer review utfördJa