Institut des
NanoSciences de Paris
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Nanostructures and quantum systems

Physics of many-body effects

  • Odile Betbeder-Matibet
  • Monique Combescot
  • François Dubin

The physics of many-body effects is investigated both theoretically and experimentally. Theoretical considerations developed over the past years about the exact nature of composite bosons have led to an original many-body theory introducing a new diagrammatic representation. This novel theory makes possible the treatment of many difficult problems in the physics of semiconductors and superconductors, in nuclear physics or in quantum information. Experimentally, in order to deterministically engineer quantum matter states, collective quantum phenomena in semiconductors are investigated using indirect exciton states in spatial traps.

More information

Recent publications :

[1] BCS ansatz, Bogoliubov approach to superconductivity and Richardson-Gaudin exact wave function, M. Combescot, W. Pogosov, O. Betbeder-Matibet, Physica C, 485 , 47 (2013)

[2] Trion ground state, excited states and absorption spectrum using electron-exciton basis, S. Shiau, M. Combescot, Y.C. Chang, Accepte a Phys. Rev. B

[3] « Gray » BCS condensate of excitons and internal Josephson effect, R. Combescot, M. Combescot, Phys. Rev. Lett. 109 , 026401 (2012)

[4] BCS ansatz for superconductivity in the canonical ensemble and the Pauli exclusion principle, G. Zhu, M. Combescot, O. Betbeder-Matibet, Physica C, 480 , 43 (2012)

[5] BCS pairing versus « moth-eaten effect » in BEC-BCS cross-over, G. Zhu, M. Combescot, Solid State Com. 152 , 90 (2012)

[6] Energy of N Cooper pairs, M. Crouzeix, M. Combescot, Phys. Rev. Lett. 107 , 267001 (2011)

[7] « Commutator formalism » for pairs correlated through Schmidt decomposition as used in Quantum Information, M. Combescot, EuroPhys. Lett., 96 , 40002 (2011)

[8] Finite temperature formalism for composite quantum particles, M. Combescot, S. Shiau, Y.C. Chang, Phys. Rev. Lett., 106 , 206403 (2011)

[9] From one to N Cooper pairs, step by step, W. Pogosov, M. Combescot, M. Crouzeix, Physica C, 471 , 566 (2011)

[10] Optical traps for electrons produced by Pauli blocking, M. Combescot, M. Moore, C. Piermarocchi, EuroPhys. Lett., 93 , 47012 (2011)

[11] Effective scatterings between electrons, excitons and trions, M. Combescot, O. Betbeder-Matibet, Euro. Phys. J. B, 79 , 401, (2011)

[12] Coboson formalism for Cooper pairs and its application to Richardson’s equations. M. Combescot, G. Zhu, Euro. Phys. J. B, 79 , 263, (2011)

[13] Fundamental collapse of the exciton-exciton effective scattering, L. Pilozzi, M. Combescot, O. Betbeder-Matibet, A. D’Andrea, Phys. Rev . B, 82 , 075327, (2010)

[14] Time evolution of two ground state excitons, M. Combescot, O. Betbeder-Matibet, Phys. Rev. B, 81 , 235203, (2010)

[15] The two-Cooper pair problem and the Pauli exclusion principle, W. Pogosov, M. Combescot, M. Crouzeix, Phys. Rev. B, 81 , 174514, (2010)

[16] « Moth-eaten » effect driven by Pauli blocking, revealed for Cooper pairs, W. Pogosov, M. Combescot, JETP Lett. 92 , 534, (2010)

[17] General many-body formalism for composite quantum particles, M. Combescot, O. Betbeder-Matibet, Phys. Rev. Lett., 104 , 206404, (2010)

[18] Shiva and Kali diagrams for composite quantum particle many-body effects, M. Combescot, O. Betbeder-Matibet,arXiv : 0902.4588v1

[19] Biexciton oscillator strength, M. Combescot, O. Betbeder-Matibet, Phys. Rev. B , 80 , 205313, (2009)

[20] Analytical approach to semiconductor Bloch equations, M. Combescot, O. Betbeder-Matibet, M. Leuenberger, EuroPhysics Lett. , 88 , 57007, (2009)

[21] Role of fermion exchanges in statistical signatures of composite bosons, M. Combescot, F. Dubin, M.A. Dupertuis ,Phys. Rev. A , 80 , 013612, (2009)

[22] Third order response to a multifrequency photon field in semiconductors, M. Combescot, O. Betbeder-Matibet, Euro. Phys. J. B, 68 , 33, (2009)

[23] Ground state energy of N Frenkel excitons, W. Pogosov, M. Combescot, Euro. Phys. J. B, 68 , 183, (2009)

[24] From « Faraday oscillation » to « Faraday oscillation » : coherent many-body effects between real and virtual excitons, M. Combescot, O. Betbeder-Matibet, Solid State Comm, 149 , 835, (2009)

[25] Composite boson manybody theory for Frenkel excitons, M. Combescot, W. Pogosov, Euro. Phys. J. B, 68 , 161, (2009)

[26] General argument supporting Bose-Einstein condensate of dark excitons in single and double quantum wells -M. Combescot, M. Leuenberger, Solid State Comm., 149 , 567, (2009)