Gul, Y;
Creeth, G;
English, D;
Holmes, SN;
Thomas, K;
Farrer, I;
Ellis, DJP;
... Pepper, M; + view all
(2019)
Conductance quantisation in patterned gate In₀.₇₅GA₀.₂₅AS up to 6 × (2e²/h).
Journal of Physics: Condensed Matter
, 31
(10)
, Article 104002. 10.1088/1361-648X/aafd05.
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Abstract
We present electrical measurements from In₀.₇₅GA₀.₂₅AS 1D channel devices with Rashba-type, spin–orbit coupling present in the 2D contact regions. Suppressed backscattering as a result of the time-reversal asymmetry at the 1D channel entrance results in enhanced ballistic transport characteristics with clear quantised conductance plateaus up to 6 × (2e ²/h). Applying DC voltages between the source and drain ohmic contacts and an in-plane magnetic field confirms a ballistic transport picture. For asymmetric patterned gate biasing, a lateral spin–orbit coupling effect is weak. However, the Rashba-type spin–orbit coupling leads to a g-factor in the 1D channel that is reduced in magnitude from the 2D value of 9 to ~6.5 in the lowest subband when the effective Rashba field and the applied magnetic field are perpendicular.
| Type: | Article |
|---|---|
| Title: | Conductance quantisation in patterned gate In₀.₇₅GA₀.₂₅AS up to 6 × (2e²/h) |
| Location: | England |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/1361-648X/aafd05 |
| Publisher version: | https://doi.org/10.1088/1361-648X/aafd05 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Rashba effect, spin-orbit coupling, ballistic transport, InGaAs material |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10065881 |
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