Quantum supercurrent transistors in carbon nanotubes

Article Abstract:

A supercurrent flowing through a discrete density of states, that is, the quantized single particle energy states of a quantum dot, or 'artificial atom', placed between superconducting electrodes is investigated by exploiting the quantum properties of finite-sized carbon nanotubes. It is observed that the product of the critical current and the normal state resistance becomes an oscillating function, in contrast to being constant in previous studies.

United States, Electric currents, Electric current, Nanotubes, Fermi surfaces

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Supercurrent reversal in quantum dots

Article Abstract:

The supercurrents are studied through a quantum dot created in a semiconductor nanowire by local electrostatic gating. The results reveal that the supercurrent reverses sign by adding a single electron spin to the quantum dot and when excited states of the quantum dot are involved in transport, the supercurrent sign depends on the character of the orbital wavefunctions.

Italy, Quantum electronics, Quantum electrodynamics

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Bipolar supercurrent in graphene

Article Abstract:

The Josephson effect in mesoscopic junctions consisting of a graphene layer contacted by two closely spaced superconducting electrodes is studied. The analysis has highlighted the special role of time reversal symmetry in graphene and has also shown the phase coherent electronic transport at the Dirac point.

Netherlands, Observations, Graphite

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