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Nadj-Perge, S. (author), Frolov, S.M. (author), Van Tilburg, J.W.W. (author), Danon, J. (author), Nazarov, Y.V. (author), Algra, R. (author), Bakkers, E.P.A.M. (author), Kouwenhoven, L.P. (author)
We have achieved the few-electron regime in InAs nanowire double quantum dots. Spin blockade is observed for the first two half-filled orbitals, where the transport cycle is interrupted by forbidden transitions between triplet and singlet states. Partial lifting of spin blockade is explained by spin-orbit and hyperfine mechanisms that enable...
journal article 2010
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Laakso, M.A. (author), Heikkilä, T.T. (author), Nazarov, Y.V. (author)
We consider the fully overheated single-electron transistor, where the heat balance is determined entirely by electron transfers. We find three distinct transport regimes corresponding to cotunneling, single-electron tunneling, and a competition between the two. We find an anomalous sensitivity to temperature fluctuations at the crossover...
journal article 2010
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Padurariu, C. (author), Nazarov, Y.V. (author)
We propose and theoretically investigate superconducting spin qubits. Superconducting spin qubit consists of a single spin confined in a Josephson junction. We show that owing to spin-orbit interaction, superconducting phase difference across the junction can polarize this spin. We demonstrate that this enables single-qubit operations and more...
journal article 2010
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Recher, P. (author), Nazarov, Y.V. (author), Kouwenhoven, L.P. (author)
We consider an optical quantum dot where an electron level and a hole level are coupled to respective superconducting leads. We find that electrons and holes recombine producing photons at discrete energies as well as a continuous tail. Further, the spectral lines directly probe the induced superconducting correlations on the dot. At energies...
journal article 2010
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Cottet, A. (author), Huertas-Hernando, D. (author), Belzig, W. (author), Nazarov, Y.V. (author)
The quasiclassical theory of superconductivity provides the most successful description of diffusive heterostructures comprising superconducting elements, namely, the Usadel equations for isotropic Green’s functions. Since the quasiclassical and isotropic approximations break down close to interfaces, the Usadel equations have to be supplemented...
journal article 2009
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Danon, J. (author), Vink, I.T. (author), Koppens, F.H.L. (author), Nowack, K.C. (author), Vandersypen, L.M.K. (author), Nazarov, Y.V. (author)
We observe multiple stable states of nuclear polarization and nuclear self-tuning over a large range of fields in a double quantum dot under conditions of electron spin resonance. The observations can be understood within an elaborated theoretical rate equation model for the polarization in each of the dots, in the limit of strong driving. This...
journal article 2009
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Heikkilä, T.T. (author), Nazarov, Y.V. (author)
We study the statistics of the fluctuating electron temperature in a metallic island coupled to reservoirs via resistive contacts and driven out of equilibrium by either a temperature or voltage difference between the reservoirs. The fluctuations of temperature are well defined provided that the energy relaxation rate inside the island exceeds...
journal article 2009
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Snyman, I. (author), Nazarov, Y.V. (author)
As a generic example of a voltage-driven superconducting structure, we study a short superconductor connected to normal leads by means of low transparency tunnel junctions with a voltage bias V between the leads. The superconducting order parameter ? is to be determined self-consistently. We study the stationary states as well as the dynamics...
journal article 2009
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Vanevi?, M. (author), Nazarov, Y.V. (author), Belzig, W. (author)
We determine charge-transfer statistics in a quantum conductor driven by a time-dependent voltage and identify the elementary transport processes. At zero temperature unidirectional and bidirectional single-charge transfers occur. The unidirectional processes involve electrons injected from the source terminal due to excess dc bias voltage. The...
journal article 2008
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Wei, H. (author), Nazarov, Y.V. (author)
We address continuous weak linear quantum measurement and argue that it is best understood in terms of statistics of the outcomes of the linear detectors measuring a quantum system, for example, a qubit. We mostly concentrate on a setup consisting of a qubit and three independent detectors that simultaneously monitor three noncommuting operator...
journal article 2008
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Snyman, I. (author), Nazarov, Y.V. (author)
We present a derivation of the Keldysh action of a general multichannel time-dependent scatterer in the context of the Landauer–Büttiker approach. The action is a convenient building block in the theory of quantum transport. This action is shown to take a compact form that only involves the scattering matrix and reservoir Green’s functions. We...
journal article 2008
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Danon, J. (author), Nazarov, Y.V. (author)
We study nuclear spin dynamics in a quantum dot close to the conditions of electron spin resonance. We show that at a small frequency mismatch, the nuclear field detunes the resonance. Remarkably, at larger frequency mismatch, its effect is opposite: The nuclear system is bistable, and in one of the stable states, the field accurately tunes the...
journal article 2008
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Nazarov, Y.V. (author)
journal article 2007
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Vanevic, M. (author), Nazarov, Y.V. (author), Belzig, W. (author)
journal article 2007
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Braude, V. (author), Nazarov, Y.V. (author)
journal article 2007
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Usmani, O. (author), Blanter, Y.M. (author), Nazarov, Y.V. (author)
journal article 2007
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Snyman, I. (author), Nazarov, Y.V. (author)
journal article 2007
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Belzig, W. (author), Bruder, C. (author), Nazarov, Y.V. (author)
journal article 2007
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Danon, J. (author), Nazarov, Y.V. (author)
We study electronic transport through a ferromagnet normal-metal ferromagnet system and we investigate the effect of hyperfine interaction between electrons and nuclei in the normal-metal part. A switching of the magnetization directions of the ferromagnets causes nuclear spins to precess. We show that the effect of this precession on the...
journal article 2006
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Campagnano, G. (author), Nazarov, Y.V. (author)
We develop a finite-element technique that allows one to evaluate correction of the order of GQ to various transport characteristics of arbitrary nanostructures. Common examples of such corrections are the weak-localization effect on conductance and universal conductance fluctuations. Our approach, however, is not restricted to conductance only....
journal article 2006
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