Zobrazeno 1 - 10
of 497
pro vyhledávání: '"Combescot, M."'
Publikováno v:
Phys. Rev. Lett. 114, 090401 (2015)
Exchange processes are responsible for the stability of elementary boson condensates with respect to their possible fragmentation. This remains true for composite bosons when single fermion exchanges are included but spin degrees of freedom are ignor
Externí odkaz:
http://arxiv.org/abs/1409.3747
We propose optical means to reveal the presence of a dark exciton condensate that does not yield any photoluminescence at all. We show that (i) the dark exciton density can be obtained from the blueshift of the excitonic absorption line induced by da
Externí odkaz:
http://arxiv.org/abs/1307.1256
Autor:
Combescot, R., Combescot, M.
It has been recently suggested that the Bose-Einstein condensate formed by excitons in the dilute limit must be dark, i.e., not coupled to photons. Here, we show that, under a density increase, the dark exciton condensate must acquire a bright compon
Externí odkaz:
http://arxiv.org/abs/1202.5976
The usual formulation of the BCS ansatz for superconductivity in the grand canonical ensemble makes the handling of the Pauli exclusion principle between paired electrons straightforward. It however tends to mask that many-body effects between Cooper
Externí odkaz:
http://arxiv.org/abs/1112.0188
Publikováno v:
Physica C 485, 47 (2013)
The Bogoliubov approach to superconductivity provides a strong mathematical support to the wave function ansatz proposed by Bardeen, Cooper and Schrieffer (BCS). Indeed, this ansatz --- with all pairs condensed into the same state --- corresponds to
Externí odkaz:
http://arxiv.org/abs/1111.4781
Autor:
Pogosov, W. V., Combescot, M.
Publikováno v:
Physica C 471, 566 (2011)
We extend the one-pair Cooper configuration towards Bardeen-Cooper-Schrieffer (BCS) model of superconductivity by adding one-by-one electron pairs to an energy layer where a small attraction acts. To do it, we solve Richardson's equations analyticall
Externí odkaz:
http://arxiv.org/abs/1103.1147
Publikováno v:
Phys. Rev. B 81, 174514 (2010)
While the one-Cooper pair problem is now a textbook exercise, the energy of two pairs of electrons with opposite spins and zero total momentum has not been derived yet, the exact handling of Pauli blocking between bound pairs being not that easy for
Externí odkaz:
http://arxiv.org/abs/0911.1688
Autor:
Pogosov, W. V., Combescot, M.
Publikováno v:
Pis'ma v ZhETF 92, 534 (2010) [JETP Letters 92, 534 (2010)]
We extend the well-known Cooper's problem beyond one pair and study how this dilute limit is connected to the many-pair BCS condensate. We find that, all over from the dilute to the dense regime of pairs, Pauli blocking induces the same "moth-eaten e
Externí odkaz:
http://arxiv.org/abs/0911.0849
Although semiconductor Bloch equations have been widely used for decades to address ultrafast optical phenomena in semiconductors, they have a few important drawbacks: (i) Coulomb terms between free electron-hole pairs require Hartree-Fock treatment
Externí odkaz:
http://arxiv.org/abs/0910.3054
Autor:
Combescot, M., Betbeder-Matibet, O.
Our goal is to provide a physical understanding of the elementary coupling between photon and biexciton and to derive the physical characteristics of the biexciton oscillator strength, following the procedure we used for trion. Instead of the more st
Externí odkaz:
http://arxiv.org/abs/0910.3051