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4 papers · 2 filters
Kondo Effect and Josephson Current through a Quantum Dot between Two Superconductors
Mahn-Soo Choi, Minchul Lee, Kicheon Kang +1
We investigate the supercurrent through a quantum dot for the whole range of couplings using the numerical renormalization group method. We find that the Josephson current switches…
Coulomb Blockade and Kondo Effect in a Quantum Hall Antidot
H. -S. Sim, M. Kataoka, Hangmo Yi +3
We propose a general capacitive model for an antidot, which has two localized edge states with different spins in the quantum Hall regime. The capacitive coupling of localized exce…
Kondo effect in a quantum dot coupled to ferromagnetic leads: A numerical renormalization group analysis
Mahn-Soo Choi, David Sanchez, Rosa Lopez
We investigate the effects of spin-polarized leads on the Kondo physics of a quantum dot using the numerical renormalization group method. Our study demonstrates in an unambiguous…
Quantum Phase Transitions and Persistent Currents in Josephson-Junction Ladders
Minchul Lee, Mahn-Soo Choi, M. Y. Choi
In this work we study quantum phase transitions and persistent currents in capacitively coupled one-dimensional Josephson-junction arrays. We will focus particularly on the roles o…