2002/03/06 by C. Tejedor, Tejedor, C., L. Martin-Moreno +1
Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #Surface and Thin Film Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.48550/arxiv.cond-mat/0203115
To appear in "Recent trends in theory of physical phenomena in high magnetic fields". NATO Science Series. Kluwer
arxiv created 2002/03/06 · openalex publication_date 2002/03/06 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Transport through a quantum dot (QD) in the Kondo regime shows alternating regions of high and low conductance when both an external magnetic field and the gate potential controlling the depth of the QD potential are varied. We present a theoretical analysis of this chessboard aspect of the magneto-conductance. An effective Kondo Hamiltonian is obtained by means of a restriction to the Hilbert space supported by just a few low energy states of N and N(+/-)1 electrons in the QD. We obtain antiferromagnetic exchange couplings depending on tunneling amplitudes and correlation effects. When either the magnetic field or the number of electrons in the QD is varied, Kondo temperature shows large oscillations due to the successive appearance of ground states having strong and weak correlation effects alternatively.