O. Sakai et al., Kondo effect in electron tunneling through quantum dots - Study with quantum Monte Carlo method, J PHYS JPN, 68(5), 1999, pp. 1640-1650
Based on the Quantum Monte Carlo (QMC) technique, we developed a method to
calculate the tunneling conductance of the quantum dot systems for which th
e Kondo effect becomes important. The method computes the conductance direc
tly from the current correlation function, and is applicable to the cases i
n which the calculation is not reduced to the computation of single particl
e Green's function. We compare the calculated conductance with experiments,
and found good qualitative agreement. The temperature in experiments seems
to be not low enough compared with the Kondo temperature in the mid region
of the two paired Coulomb oscillation peaks. We studied the Zeeman field e
ffect; and showed that the conductance is strongly suppressed when it has b
een enhanced by the Kondo effect. The conductance of an Aharonov-Bhom circu
it including dots was also studied.