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Interaction effects at crossings of spin-polarized one-dimensional subbands

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. Green open access

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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 > 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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