François Konschelle

• E-mail: fraschelle (at) free (dot) fr
• Skype: francois (dot) konschelle

• Researcher ID: D-3804-2014
• Orcid: 0000-0002-8193-2832
• Google Scholar profile: 54SvhF8AAAAJ

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

• An up-to-date and complete list is available on the Hal (CNRS) server at: http://hal.archives-ouvertes.fr/aut/konschelle/
• Some articles in free-to-download version available at: http://www.mendeley.com/profiles/francois-konschelle/

Articles

1. Anomalous fluctuation regimes at FFLO transition. François Konschelle, Jérôme Cayssol and Alexandre I. Buzdin. Europhys. Lett. 71 67001 (2007) or arXiv:cond-mat/0612387.
2. 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.
3. Magnetic moment manipulation by a Josephson current. François Konschelle and Alexandre I. Buzdin. Phys. Rev. Lett. 102 017001 (2009) or arXiv:0810.4286.
4. 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.
5. 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.
6. 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).
7. 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.
8. Transport equations for superconductors in the presence of spin interaction. François Konschelle. Eur. Phys. J. B 87 119 (2014) or arXiv:1403.1797.
9. 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.
10. 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.
11. 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.
12. 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.
13. 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.

Talks and posters

• Non-Abelian electromagnetism in spin textured Josephson systems. François Konschelle, Ilya V. Tokatly and F. Sebastián Bergeret. Talk given at the Workshop Condensed matter physics meets relativistic quantum field theory in Tours, France, June 2015.
• A glimpse on spin-orbit effect in Josephson systems. François Konschelle, Ilya V. Tokatly and F. Sebastián Bergeret. Talk given at the GDR de physique Mésoscopique in Aussois, France, December 2015. The slides and a summary of the talk can be download.
• Superconducting fluctuations near the FFLO phase. François Konschelle, Jérôme Cayssol and Alexandre I. Buzdin. Talk given at the 25-th International Conference on Low Temperatures Physics (LT25) in Amsterdam, The Netherlands, August 2008. The associated abstract is published as J. Phys.: Conf. Ser. 150 052121 (2009) or hal:00319673 [CNRS preprint server].

Research projects

• Perspectives in mesoscopic superconductivity: Magneto-electric effects, Topological Majorana modes, and beyond. François Konschelle. Proposed in 2016. PDF
• TACSS: Topological aspects of coherent superconducting spintronics. François Konschelle. Presented for a Marie Sklodowska-Curie Actions, Individual fellowship, in 2015. PDF

Other publications

• Magneto-electric coupling in a two-dimensional ballistic Josephson junction with in-plane magnetic texture. François Konschelle. arXiv:1408.4533.
• 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

• Pedagogical activities on the StackExchange-Physics website
• Research-related questions and answers on Physics-Overflow website
• Webmaster of the Phyches website (in french)
• Short-text blogging activity on Twitter

Short Curriculum Vitae

• Sept. 1983: Birth in Bordeaux, France.
• May - June 2005: Master thesis supervised by A. Wuerger at the Bordeaux University, on the deformation of membranes.
• Oct. 2006 - Sept. 2009: Ph.D. at Bordeaux University, France, under the supervision of A.I. Buzdin and J. Cayssol, on the interaction between superconductivity and magnetic orders, especially in inhomogeneous (FFLO) bulk states and Josephson (π-phase transition) systems.
• Nov. 2009 - Oct. 2011: Post-doc at the Technische Universiteit Delft (TU-Delft), The Netherlands, working with Ya.M. Blanter on coherence aspects of nano-mechanical oscillators, especially torsional SQUID.
• Feb. 2012 - Dec. 2014: Post-doc at the Rheinisch-Westfälische Technische Hochschule Aachen (RWTH-Aachen), Germany, working with Fabian Hassler on the Majorana modes in mesoscopic structures, especially their quantum information perspectives.
• Dec. 2014 - Aug. 2016: Post-doc at the Centro de Física de Materiales (CFM) / Materials Physics Center / Materialen Fisika Zentroa, in Donostia / San Sebastián, Spain, working with Sebastián Bergeret on gauge-covariant quasi-classic formalism, for mesoscopic superconductivity.
• Sept. 2016 - Aug. 2017: ATER (Attaché temporaire d'enseignement et de recherche / Assistant lecturer) at the Université François Rabelais de Tours, France. Research at the Laboratoire de Mathématiques et Physique Théorique (LMPT - CNRS UMR7350).