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Zero-bias anomaly and kondo-assisted quasiballistic 2D transport

Ghosh, A; Wright, MH; Siegert, C; Pepper, M; Farrer, I; Ford, CJB; Ritchie, DA; (2005) Zero-bias anomaly and kondo-assisted quasiballistic 2D transport. PHYS REV LETT , 95 (6) , Article 066603. 10.1103/PhysRevLett.95.066603. Green open access

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Abstract

Nonequilibrium transport measurements in mesoscopic quasiballistic 2D electron systems show an enhancement in the differential conductance around the Fermi energy. At very low temperatures, such a zero-bias anomaly splits, leading to a suppression of linear transport at low energies. We also observed a scaling of the nonequilibrium characteristics at low energies which resembles electron scattering by two-state systems, addressed in the framework of two-channel Kondo model. Detailed sample-to-sample reproducibility indicates an intrinsic phenomenon in unconfined 2D systems in the low electron-density regime.

Type: Article
Title: Zero-bias anomaly and kondo-assisted quasiballistic 2D transport
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.95.066603
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.95.066603
Language: English
Additional information: © 2005 The American Physical Society
Keywords: 2-LEVEL TUNNELING SYSTEMS, MAGNETIC-FIELD, QUANTUM DOTS, CONDUCTANCE, JUNCTIONS, SCATTERING, COULOMB, BARRIER, METALS, ATOMS
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/1314417
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