Negative differential conductance induced by spin-charge separation.
Spin-charge states of correlated electrons in a one-dimensional quantum dot attached to interacting leads are studied in the nonlinear transport regime. With nonsymmetric tunnel barriers, regions of negative differential conductance induced by spin-charge separation are found. They are due to a correlation-induced trapping of higher-spin states without magnetic field and are associated with a strong increase in the fluctuations of the electron spin.
Dipartimento di Fisica, INFM-Lamia, Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy.
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F
Cavaliere
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Braggio
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JT
Stockburger
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M
Sassetti
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B
Kramer