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Comptes Rendus Physique
Volume 3, n° 6
pages 709-715 (2002)
Doi : S1631-0705(02)01365-8
Received : 24 May 2002 ;  accepted : 28 June 2002
Quantum transitions in bilayer states
Transition quantique entre états électroniques de systèmes bi-couche
 

Vincent Pasquier
Service de physique théorique, C.E. Saclay, 91191 Gif-sur-Yvette, France 

Note presented by Guy Laval

Abstract

The possible phase transitions when two layers at filling factor ν t =1 are gradually separated are studied in this article. In the bosonic case the system should undergo a pairing transition from a Fermi liquid to an incompressible state. In the Fermionic case, the state evolves from an incompressible (1,1,1) state to a Fermi liquid. It is speculated that there is an intermediate phase involving charge two quasiparticles. To cite this article: V. Pasquier, C. R. Physique 3 (2002) 709-715.

Résumé

J'étudie la transition de phase qui se produit lorsque deux couches dont le facteur de remplissage total vaut 1 sont séparées de façon graduelle. Dans le cas bosonique on s'attend à ce que le système subisse une transition de type BCS d'un liquide de Fermi vers un état incompressible. Dans le cas Fermionique l'état évolue à partir d'un état incompressible vers un liquide de Fermi. Je conjecture l'existence d'une phase intermédiaire pour laquelle la charge des quasiparicules est égale à deux. Pour citer cet article : V. Pasquier, C. R. Physique 3 (2002) 709-715.


Keywords : Hall effect, Fermi liquid, bilayer systems, Bose-Einstein condensate

Mots-clé : effet Hall, liquide de Fermi, système bicouches, condensat de Bose-Einstein



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