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Padurariu, C. (author), Jonkcheere, T. (author), Melin, R. (author), Feinberg, D. (author), Martin, T. (author), Nazarov, Y.V. (author)
We describe the proximity effect in a short disordered metallic junction between three superconducting leads. Andreev bound states in the multiterminal junction may cross the Fermi level. We reveal that for a quasicontinuous metallic density of states, crossings at the Fermi level manifest as a closing of the proximity-induced gap. We calculate...
journal article 2015
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Ansari, M.H. (author), Nazarov, Y.V. (author)
We present a universal relation between the flow of a Renyi entropy and the full counting statistics of energy transfers. We prove the exact relation for a flow to a system in thermal equilibrium that is weakly coupled to an arbitrary time-dependent and nonequilibrium system. The exact correspondence, given by this relation, provides a simple...
journal article 2015
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Riwar, R.P. (author), Houzet, M. (author), Meyer, J.S. (author), Nazarov, Y.V. (author)
We study a short multichannel superconducting junction subject to dc and ac phase biases. The ac modulation changes the occupation of the Andreev bound states formed at the constriction by transitions between bound states and the continuum. In a short junction, the nonequilibrium Andreev bound-state population may relax through processes that...
journal article 2015
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Ansari, M.H. (author), Nazarov, Y.V. (author)
We evaluate Rényi entropy flows from generic quantum heat engines (QHE) to a weakly coupled probe environment kept in thermal equilibrium. We show that the flows are determined not only by heat flow but also by a quantum coherent flow that can be separately measured in experiment apart from the heat flow measurement. The same pertains to Shannon...
journal article 2015
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Reutlinger, J. (author), Glazman, L. (author), Nazarov, Y.V. (author), Belzig, W. (author)
The superconducting proximity effect leads to strong modifications of the local density of states in diffusive or chaotic cavity Josephson junctions, which displays a phase-dependent energy gap around the Fermi energy. The so-called minigap of the order of the Thouless energy ETh is related to the inverse dwell time in the diffusive region in...
journal article 2014
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Yokoyama, T. (author), Eto, M. (author), Nazarov, Y.V. (author)
We investigate theoretically the Josephson junction of semiconductor nanowire with strong spin-orbit (SO) interaction in the presence of magnetic field. By using a tight-binding model, the energy levels En of Andreev bound states are numerically calculated as a function of phase difference ? between two superconductors in the case of short...
journal article 2014
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Godschalk, F. (author), Nazarov, Y.V. (author)
Recently, we have proposed the half-Josephson laser (HJL): a device that combines lasing with superconducting leads, providing a locking between the optical phase and the superconducting phase difference between the leads. In this work, we propose and investigate two setups derived from a superconducting quantum interference device (SQUID),...
journal article 2014
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Pikulin, D. (author), Nazarov, Y.V. (author)
Motivated by the recent advances in studying Majorana states in nanowires under conditions of the superconducting proximity effect, we address the correspondence between the common topological transition in an infinite system and a topological transition of another type that manifests itself in the positions of the poles of the scattering...
journal article 2013
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Godschalk, F. (author), Nazarov, Y.V. (author)
We describe a superconducting device capable of producing laser light in the visible range at half the Josephson generation frequency, with the optical phase of the light locked to the superconducting phase difference. An earlier proposed device, the so-called “half-Josephson laser” [ Phys. Rev. Lett. 107 073901 (2011)], cannot provide long...
journal article 2013
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Hriscu, A.M. (author), Nazarov, Y.V. (author)
We propose a way to achieve quantum synchronization of two canonically conjugated variables. For this, we employ a superconducting device where the synchronization of Josephson and Bloch oscillations results in the quantization of transresistance similar to that in the (fractional) quantum Hall effect. An LC oscillator is a key component to...
journal article 2013
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Reutlinger, J. (author), Glazman, L. (author), Nazarov, Y.V. (author), Belzig, W. (author)
The density of Andreev levels in a normal metal (N) in contact with two superconductors (S) is known to exhibit an induced minigap related to the inverse dwell time. We predict a small secondary gap just below the superconducting gap edge—a feature that has been overlooked so far in numerous microscopic studies of the density of states in S?N?S...
journal article 2013
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Padurariu, C. (author), Keijzers, C.J.H. (author), Nazarov, Y.V. (author)
We study theoretically dynamics in a Josephson junction coupled to a mechanical resonator looking at the signatures of the resonance in dc electrical response of the junction. Such a system can be realized experimentally as a suspended ultraclean carbon nanotube brought in contact with two superconducting leads. A nearby gate electrode can be...
journal article 2012
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Pikulin, D.I. (author), Nazarov, Y.V. (author)
We derive a generic phenomenological model of a Majorana Josephson junction that accounts for avoided crossing of Andreev states, and investigate its dynamics at constant bias voltage to reveal an unexpected pattern of an any-? Josephson effect in the limit of slow decoherence: sharp peaks in noise not related to any definite fraction of...
journal article 2012
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Padurariu, C. (author), Hassler, F. (author), Nazarov, Y.V. (author)
Motivated by recent experiments, we study theoretically the full counting statistics of radiation emitted below the threshold of parametric resonance in a Josephson-junction circuit. In contrast to most optical systems, a significant part of emitted radiation can be collected and converted to an output signal. This permits studying the...
journal article 2012
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Yokoyama, T. (author), Eto, M. (author), Nazarov, Y.V. (author)
We theoretically study the current-phase relation in semiconductor nanowire Josephson junction in the presence of spin-orbit interaction. In the nanowire, the impurity scattering with strong SO interaction is taken into account using the random matrix theory. In the absence of magnetic field, the Josephson current I and phase difference ?...
conference paper 2012
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Laakso, M.A. (author), Heikkilä, T.T. (author), Nazarov, Y.V. (author)
We describe the statistics of temperature fluctuations in a SINIS structure, where a normal metal island (N) is coupled by tunnel junctions (I) to two superconducting leads (S). We specify conditions under which this structure exhibits manifestly non-Gaussian fluctuations of temperature. We consider both the Gaussian and non-Gaussian regimes of...
journal article 2012
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Vanevic, M. (author), Nazarov, Y.V. (author)
Quantum phase slips are traditionally considered in diffusive superconducting wires which are assumed homogeneous. We present a definite estimate for the amplitude of phase slips that occur at a weak inhomogeneity in the wire where local resistivity is slightly increased. We model such a weak link as a general coherent conductor and show that...
journal article 2012
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Snyman, I. (author), Nazarov, Y.V. (author)
We prove theoretically the possibility of electric-field controlled polaron formation involving flexural (bending) modes in suspended carbon nanotubes. Upon increasing the field, the ground state of the system with a single extra electron undergoes a first-order phase transition between an extended state and a localized polaron state. For a...
journal article 2012
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Laakso, M.A. (author), Heikkilä, T.T. (author), Nazarov, Y.V. (author)
We propose a mesoscopic setup which exhibits strong and manifestly non-Gaussian fluctuations of energy and temperature when suitably driven out of equilibrium. The setup consists of a normal metal island (N) coupled by tunnel junctions (I) to two superconducting leads (S), forming a SINIS structure, and is biased near the threshold voltage for...
journal article 2012
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Nazarov, Y.V. (author)
We demonstrate that the condensed matter quantum systems encompassing two reservoirs connected by a junction permit a natural definition of flows of conserved measures, i.e., Rényi entropies. Such flows are similar to the flows of physical conserved quantities such as charge and energy. We develop a perturbation technique that permits efficient...
journal article 2011
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