Graham, AC;
Thomas, KJ;
Pepper, M;
Cooper, NR;
Simmons, MY;
Ritchie, DA;
(2003)
Interaction effects at crossings of spin-polarized one-dimensional subbands.
PHYS REV LETT
, 91
(13)
, Article 136404. 10.1103/PhysRevLett.91.136404.
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Abstract
We report conductance measurements of ballistic one-dimensional (1D) wires defined in GaAs/AlGaAs heterostructures in an in-plane magnetic field, B. When the Zeeman energy is equal to the 1D subband energy spacing, the spin-split subband Nup arrow intersects (N+1)down arrow, where N is the index of the spin-degenerate 1D subband. At the crossing of N=1up arrow and N=2down arrow subbands, there is a spontaneous splitting giving rise to an additional conductance structure evolving from the 1.5(2e(2)/h) plateau. With further increase in B, the structure develops into a plateau and lowers to 2e(2)/h. With increasing temperature and magnetic field the structure shows characteristics of the 0.7 structure. Our results suggest that at low densities a spontaneous spin splitting occurs whenever two 1D subbands of opposite spins cross.
| Type: | Article |
|---|---|
| Title: | Interaction effects at crossings of spin-polarized one-dimensional subbands |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.91.136404 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.91.136404 |
| Language: | English |
| Additional information: | © 2003 The American Physical Society |
| Keywords: | QUANTUM POINT CONTACTS, QUANTIZED CONDUCTANCE, ELECTRON-GAS, WIRES, TEMPERATURE, PLATEAUS, CHANNELS, FIELD |
| 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 |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1314367 |
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