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20 papers · 2 filters
Exciting half-integer charges in a quantum point contact
I. Snyman, Y. V. Nazarov
We study a voltage-driven quantum point contact (QPC) strongly coupled to a qubit. We predict pronounced observable features in the QPC current that can be interpreted in terms of…
Effect of spin-orbit coupling on the excitation spectrum of Andreev billiards
B. Béri, J. H. Bardarson, C. W. J. Beenakker
We consider the effect of spin-orbit coupling on the low energy excitation spectrum of an Andreev billiard (a quantum dot weakly coupled to a superconductor), using a dynamical num…
Formation of a Metallic Contact: Jump to Contact Revisited
C. Untiedt, M. J. Caturla, M. R. Calvo +3
The transition from tunneling to metallic contact between two surfaces does not always involve a jump, but can be smooth. We have observed that the configuration and material compo…
Mesoscopic Spin Hall Effect
J. H. Bardarson, I. Adagideli, Ph. Jacquod
We investigate the spin Hall effect in ballistic chaotic quantum dots with spin-orbit coupling. We show that a longitudinal charge current can generate a pure transverse spin curre…
Formation of Atomic-Sized Contacts by Electrochemical Methods
M. R. Calvo, A. I. Mares, V. Climent +2
Electrochemical methods have recently become an interesting tool for fabricating and characterizing nanostructures at room temperature. Simplicity, low cost and reversibility are s…
Excitation gap of a graphene channel with superconducting boundaries
M. Titov, A. Ossipov, C. W. J. Beenakker
We calculate the density of states of electron-hole excitations in a superconductor/normal-metal/superconductor (SNS) junction in graphene, in the long-junction regime that the sup…