Features of spin-charge separation in the equilibrium conductance through finite rings

Details Features of spin-charge separation in the equilibrium conductance through finite rings Features of spin-charge separation in the equilibrium conductance through finite rings

2008-11-14

arxiv.org/abs/0811.2330v1

Phys. Rev. B 79, 035112 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 7 figures

Scientific paper

10.1103/PhysRevB.79.035112

We calculate the conductance through rings with few sites $L$ described by the $t-J$ model, threaded by a magnetic flux $\Phi$ and weakly coupled to conducting leads at two arbitrary sites. The model can describe a circular array of quantum dots with large charging energy $U$ in comparison with the nearest-neighbor hopping $t$. We determine analytically the particular values of $\Phi$ for which a depression of the transmittance is expected as a consequence of spin-charge separation. We show numerically that the equilibrium conductance at zero temperature is depressed at those particular values of $\Phi $ for most systems, in particular at half filling, which might be easier to realize experimentally.

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