François Konschelle
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- E-mail: fraschelle (at) free (dot) fr
- Skype: francois (dot) konschelle
Cours, lectures, notes, ... on a different page
Research interests
- Superconductivity, especially mesoscopic and topological aspects of the associated quantum field theory
- Quasi-classic methods, especially the gauge-covariant transport ones
- Mechanical displacement of quantum coherent structures
- Quantum state manipulation using coherent circuits
Past achievements
- Gauge-covariant quasi-classic transport formalism for the superconducting state in the presence of spin interaction (including spin-orbit and exchange interactions). See this arXiv paper. The generic theory has been developed during the winter 2013-2014, and several applications of the gauge-covariant-transport formalism can be found in the remaining of my works.
- Electric manipulation of the magnetization of a Josephson 2D bridge, when Zeeman and spin-orbit effects conspire to create a coherent magneto-electric coupling. See the demonstration of the existence of the magneto-electric effect and the quasi-classic theory of the magneto-electric manipulation. In collaboration with A.I. Buzdin (2009), I.V. Tokalty and F.S. Bergeret (2015).
- Generalisation of the Josephson relations when the superconducting condensate is mechanically displaced. See the theoretical prediction or the experimental verification of the predicted self-sustained oscillations. Theory in collaboration with Ya.M. Blanter (2011). Experiments performed by S. Etaki, H. Yamaguchi and H. van der Zant (2010-2013).
- Decoherence mechanism of the topological wires hosting some Majorana modes, with peculiar emphasis on the propagation of a quantum error along the topological circuit. For a clean p-wave superconductor, the qubit-flip error propagates at the Fermi velocity, somehow a problem for the topological protection. See this arXiv paper. In collaboration with F. Hassler (2013).
- Fluctuations description of the inhomogeneous superconducting state, giving smoking gun experiments possibilities (radically different exponents of the Gaussian fluctuations than for the homogeneous case). See the letter and the long arXiv versions of the work. In collaboration with J. Cayssol and A.I. Buzdin (2006-2009).
Publications
Articles
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Anomalous fluctuation regimes at FFLO transition. François Konschelle, Jérôme Cayssol and Alexandre I. Buzdin. Europhys. Lett. 71 67001 (2007) or arXiv:cond-mat/0612387.
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Nonsinusoidal current-phase relation in strongly ferromagnetic and moderately disordered SFS junctions. François Konschelle, Jérôme Cayssol and Alexandre I. Buzdin. Phys. Rev. B 78 134505 (2008) or arXiv:0807.2560.
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Magnetic moment manipulation by a Josephson current. François Konschelle and Alexandre I. Buzdin. Phys. Rev. Lett. 102 017001 (2009) or arXiv:0810.4286.
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Oscillations of magnetization and conductivity in anisotropic Fulde-Ferrell-Larkin-Ovchinnikov superconductors. François Konschelle, Jérôme Cayssol and Alexandre I. Buzdin. Phys. Rev. B 79 224526 (2009) or arXiv:0902.2298.
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Long-ranged singlet proximity effect in ferromagnetic nanowires. François Konschelle, Jérôme Cayssol and Alexandre I. Buzdin. Phys. Rev. B 82 180509 (R) (2010) or arXiv:1009.3181.
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Self-Sustained Oscillations of a Torsional SQUID Resonator Induced by Lorentz-Force Back-Action. Samir Etaki, François Konschelle, Yaroslav M. Blanter, H. Yamaguchi and Herre S. J. van der Zant. Nature Comm. 4 1803 (2013).
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Effects of Nonequilibrium Noise on a Quantum Memory Encoded in Majorana Zero Modes. François Konschelle and Fabian Hassler. Phys. Rev. B 88 075431 (2013) or arXiv:1306.2519.
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Transport equations for superconductors in the presence of spin interaction. François Konschelle. Eur. Phys. J. B 87 119 (2014) or arXiv:1403.1797.
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Electromotive interference in a mechanically oscillating superconductor: Generalized Josephson relations and self-sustained oscillations of a torsional SQUID. François Konschelle and Yaroslav M. Blanter. Europhys. Lett. 109 68004 (2015) or arXiv:1110.1357.
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Theory of the spin-galvanic effect and the anomalous phase-shift φ in superconductors and Josephson junctions with intrinsic spin-orbit coupling. François Konschelle, Ilya V. Tokatly and F. Sebastián Bergeret. Phys. Rev. B 92 125443 (2015) or arXiv:1506.02977.
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Semiclassical quantization of spinning quasiparticles in ballistic Josephson junctions. François Konschelle, F. Sebastián Bergeret and Ilya V. Tokatly. Phys. Rev. Lett. 116 237002 (2016) or arXiv:1601.02973.
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Ballistic Josephson junctions in the presence of generic spin dependent fields. François Konschelle, Ilya V. Tokatly and F. Sebastián Bergeret. Phys. Rev. B 94 014515 (2016) or arXiv:1604.08455.
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Andreev spectrum of a Josephson junction with spin-split superconductors. Bogusz Bujnowski, Dario Bercioux, François Konschelle, Jérôme Cayssol and F. Sebastián Bergeret. Europhys. Lett. 115 67001 (2016) or arXiv:1607.07772.
- Gradient expansion of the non-Abelian gauge-covariant Moyal star-product. François Konschelle. arXiv:2111.01497.
Talks and posters
Research projects
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Participation to the QNEMS (Quantum Nano Electro Mechanical Systems) project at TU-Delft University in 2009-2011. Modelization of the quantum aspect of superconducting displacement.
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Perspectives in mesoscopic superconductivity: Magneto-electric effects, Topological Majorana modes, and beyond. François Konschelle. Proposed in 2016. PDF
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TACSS: Topological aspects of coherent superconducting spintronics. François Konschelle. Presented for a Marie Sklodowska-Curie Actions, Individual fellowship, in 2015. PDF
Other publications
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Magneto-electric coupling in a two-dimensional ballistic Josephson junction with in-plane magnetic texture. François Konschelle. arXiv:1408.4533.
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Supraconductivité en présence de forts effets paramagnétique et spin-orbite. François Konschelle - Ph.D. advisors : Jérôme Cayssol and Alexandre I. Buzdin. tel:00517920 [CNRS thesis server] (in french).
Publishing activities on the web