A clean ballistic quantum point contact in strontium titanate

Evgeny Mikheev, Ilan T. Rosen, Johannes Kombe, François Damanet, Marc A. Kastner, David Goldhaber-Gordon

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Abstract

The perovskite oxide strontium titanate (SrTiO3) combines electrostatic
tunability, superconductivity and spin–orbit coupling, and is of potential
use in the development of quantum devices. However, exploring quantum
effects in SrTiO3 nanostructures is challenging because of the presence
of disorder. Here we report high-mobility, gate-tunable devices in SrTiO3
that have ballistic constrictions and clean normal-state conductance
quantization. Our devices are based on SrTiO3 two-dimensional electron gas
channels that have a thin hafnium oxide barrier layer between the channel
and an ionic liquid gate. Conductance plateaus show twofold degeneracy
that persists for magnetic fields of at least 5 T. This is above what is expected
from the g factors extracted at high fields and could be a signature of
electron pairing extending outside the superconducting regime.
Original languageEnglish
Pages (from-to)417–424
Number of pages8
JournalNature Electronics
Volume6
Issue number6
DOIs
Publication statusPublished - 22 Jun 2023

Keywords

  • perovskite oxide strontium titanate
  • electrostatic tunability
  • superconducting devices

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