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Hristo Barakov on Muck Rack

Hristo Barakov

As seen in: Physical Review B
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Articles

Supercurrent in the Presence of Direct Transmission and a Resonant Localized State

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By Hristo Barakov, Grzegorz Mazur, Nick van Loo, Vukan Levajac
| Physical Review B
Abstract We study the current-phase relation (CPR) of an InSb-Al nanowire Josephson junction in parallel magnetic fields up to 700 mT. At high magnetic fields and in narrow voltage intervals of a gate under the junction, the CPR exhibits π shifts. The supercurrent declines within these gate intervals and shows asymmetric gate voltage dependence above and below them. We detect these features sometimes also at zero magnetic field.
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Abundance of Weyl points in semiclassical multiterminal superconducting nanostructures

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By Hristo Barakov, Yuli V. Nazarov
| Physical Review B
Abstract We show that the quasicontinuous gapless spectrum of Andreev bound states in multiterminal semi-classical superconducting nanostructures exhibits a large number of topological singularities. We concentrate on Weyl points in a four-terminal nanostructure and compute their density and correlations in three-dimensional parameter space for a universal random matrix theory model as well as for the concrete nanostructures described by the quantum circuit theory.
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