SU(4) Kondo rffect in carbon nanotubes

Manh Soo Choi; Rosa López; Ramón Aguado

doi:10.1103/PhysRevLett.95.067204

SU(4) Kondo rffect in carbon nanotubes

Manh Soo Choi^*
, Rosa López
, Ramón Aguado

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

150 Citations (Scopus)

Abstract

We investigate theoretically the nonequilibrium transport properties of carbon nanotube quantum dots. Owing to the two-dimensional band structure of graphene, a double orbital degeneracy plays the role of a pseudospin, which is entangled with the spin. Quantum fluctuations between these 4 degrees of freedom result in an SU(4) Kondo effect at low temperatures. This exotic Kondo effect manifests as a four-peak splitting in the nonlinear conductance when an axial magnetic field is applied.

Original language	English
Article number	067204
Journal	Physical review letters
Volume	95
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.95.067204
Publication status	Published - 2005 Aug 5

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.95.067204

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title = "SU(4) Kondo rffect in carbon nanotubes",

abstract = "We investigate theoretically the nonequilibrium transport properties of carbon nanotube quantum dots. Owing to the two-dimensional band structure of graphene, a double orbital degeneracy plays the role of a pseudospin, which is entangled with the spin. Quantum fluctuations between these 4 degrees of freedom result in an SU(4) Kondo effect at low temperatures. This exotic Kondo effect manifests as a four-peak splitting in the nonlinear conductance when an axial magnetic field is applied.",

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AB - We investigate theoretically the nonequilibrium transport properties of carbon nanotube quantum dots. Owing to the two-dimensional band structure of graphene, a double orbital degeneracy plays the role of a pseudospin, which is entangled with the spin. Quantum fluctuations between these 4 degrees of freedom result in an SU(4) Kondo effect at low temperatures. This exotic Kondo effect manifests as a four-peak splitting in the nonlinear conductance when an axial magnetic field is applied.

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SU(4) Kondo rffect in carbon nanotubes

Abstract

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