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8 papers · 2 filters
Probing Spin States of Coupled Quantum Dots by dc Josephson Current
Yu Zhu, Qing-feng Sun, Tsung-han Lin
We propose an idea for probing spin states of two coupled quantum dots (CQD), by the dc Josephson current flowing through them. This theory requires weak coupling between CQD and e…
Double quantum dots: interdot interactions, co-tunneling, and Kondo resonances without spin
Qing-feng Sun, Hong Guo
We show that through an interdot off-site electron correlation in a double quantum-dot (DQD) device, Kondo resonances emerge in the local density of states without the electron spi…
Hamiltonian approach to the ac Josephson effect in superconducting-normal hybrid systems
Qing-feng Sun, Hong Guo, Jian Wang
The ac Josephson effect in hybrid systems of a normal mesoscopic conductor coupled to two superconducting (S) leads is investigated theoretically. A general formula of the ac compo…
Duality and Non-linear Response for Quantum Hall Systems
B. P. Dolan, C. P. Burgess
We derive the implications of particle-vortex duality for the electromagnetic response of Quantum Hall systems beyond the linear-response regime. This provides a first theoretical…
Kondo resonance in a multi-probe quantum dot
Qing-feng Sun, Hong Guo
We present a theoretical analysis of a possible route for directly detecting Kondo resonances in local density of states (LDOS) of an interacting quantum dot. By very weakly couple…
Excess Kondo resonance in a quantum dot device with normal and superconducting leads: the physics of Andreev-normal co-tunneling
Qing-feng Sun, Hong Guo, Tsung-han Lin
We report on a novel Kondo phenomenon of interacting quantum dots coupled asymmetrically to a normal and a superconducting lead. The effects of intradot Coulomb interaction and And…