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

JULIÁN RINCÓN, A. A. ALIGIA, AND K. HALLBERG

PHYSICAL REVIEW B

AMER PHYSICAL SOC

Año: 2009 vol. 79 p. 351121 - 351127

1098-0121

<!-- @page { size: 21cm 29.7cm; margin: 2cm } P { margin-bottom: 0.21cm } --> 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 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.