Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session L33: Quantum Devices and 2D Materials
11:15 AM–2:03 PM,
Wednesday, March 6, 2019
BCEC
Room: 204B
Sponsoring
Unit:
FIAP
Chair: Eui-Hyeok Yang
Abstract: L33.00004 : 0.7 Anomaly, Spin-Mixing and Emergent Spin Gap in Quantum Point Contacts with Strong Spin-Orbit Interaction
11:51 AM–12:03 PM
Presenter:
Karina Hudson
(Univ of New South Wales)
Authors:
Karina Hudson
(Univ of New South Wales)
Ashwin Srinivasan
(Univ of New South Wales)
Olga Goulko
(Physics, Boise State University)
Jarrod Adam
(Univ of New South Wales)
Qingwen WANG
(Univ of New South Wales)
LaReine Yeoh
(Univ of New South Wales)
Oleh Klochan
(Univ of New South Wales)
Ian Farrer
(Electronic and Electrical Engineering, University of Sheffield)
David A Ritchie
(Semiconductor Physics, University of Cambridge)
Jan Von Delft
(Arnold Sommerfeld Centre for Theoretical Physics, Ludwig-Maximilians University)
Alex R Hamilton
(Univ of New South Wales)
Here we characterise the 0.7 anomaly for 1D holes with strong interactions and strong SOI. Similarly to electrons, the 0.7 anomaly in 1D holes shares the signature behaviour of evolving to 0.5(2e2/h) in applied magnetic field. However, while the electron 0.7 anomaly isotropically Zeeman spin-splits in magnetic field, the hole 0.7 anomaly exhibits a weak anistropic response in in-plane magnetic field. We show the magnetic field orientation dependence of the first 1D hole subband, and demonstrate a new and robust signature for the opening of a spin gap. We compare our measurements to recent theory where the Rashba SOI term predicts the correct anisotropy of the Zeeman spin-splitting in the first hole subband as well as the opening of a spin gap in magnetic field. The opening of a spin gap in 1D hole semiconducting systems has significant implications for the formation of helical spin gaps and Majorana excitations.
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