Kondo effect in electron tunneling through quantum dots - Study with quantum Monte Carlo method

Citation
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
Citations number
29
Categorie Soggetti
Physics
Journal title
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
ISSN journal
00319015 → ACNP
Volume
68
Issue
5
Year of publication
1999
Pages
1640 - 1650
Database
ISI
SICI code
0031-9015(199905)68:5<1640:KEIETT>2.0.ZU;2-4
Abstract
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.