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Compressibility Measurements of Quasi-One-Dimensional Quantum Wires

Smith, LW; Hamilton, AR; Thomas, KJ; Pepper, M; Farrer, I; Griffiths, JP; Jones, GAC; (2011) Compressibility Measurements of Quasi-One-Dimensional Quantum Wires. PHYS REV LETT , 107 (12) , Article 126801. 10.1103/PhysRevLett.107.126801. Green open access

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Abstract

We report measurements of the compressibility of a one-dimensional quantum wire, defined in the upper well of a GaAs/AlGaAs double quantum well heterostructure. A wire defined simultaneously in the lower well probes the ability of the upper wire to screen the electric field from a biased surface gate. The technique is sensitive enough to resolve spin splitting of the subbands in the presence of an in-plane magnetic field. We measure a compressibility signal due to the 0.7 structure and study its evolution with increasing temperature and magnetic field. We see no evidence of the formation of the quasibound state predicted by the Kondo model, instead our data are consistent with theories which predict that the 0.7 structure arises as a result of spontaneous spin polarization.

Type: Article
Title: Compressibility Measurements of Quasi-One-Dimensional Quantum Wires
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.107.126801
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.107.126801
Language: English
Additional information: © 2011 American Physical Society
Keywords: ELECTRON-GAS, 2-DIMENSIONAL ELECTRON, SPIN POLARIZATION, OSCILLATIONS, TRANSPORT
UCL classification: 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
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: http://discovery.ucl.ac.uk/id/eprint/1325231
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