Collective properties of excitons in the presence of a two-dimensional electron gas期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Collective properties of excitons in the presence of a two-dimensional electron gas

Authors:	Oleg L Berman Godfrey Gumbs Patrick A Folkes

Institution:	1. Department of Clinical Pharmacology, Hospices Civils de Lyon, Lyon, France; UMR 5558, CNRS, Villeurbanne, France; Claude Bernard Lyon 1 University, Lyon, France;2. Department of Cardiology, Centre Hospitalier Universitaire, Grenoble, France; INSERM 1039, Bioclinic Radiopharmaceutics Laboratory, Joseph Fourier University, Grenoble, France;3. Department of General Practice, Claude Bernard Lyon 1 University, Lyon, France;4. Plurithematic Clinical Investigation Centre, CIC-P-Inserm CHU de Nancy, Lorraine Institute of Heart and Vessels Louis Mathieu, Vand?uvre-lès-Nancy, France; Henri Poincaré Nancy University, France;5. Department of General Practice, Faculty of Medicine, Rouen University, Rouen, France; CIC Inserm 0204, CHU of Rouen, Rouen, France;6. Vascular Functionnal Exploration Laboratory, CHU Angers, Angers, France;7. Arnaud de Villeneuve Hospital, CHU Montpellier, Montpellier, France;8. Department of Nephrology and Hypertension, Edouard Herriot Hospital, Hospices Civils de Lyon, Lyon, France;9. Clinical Investigation Center, CIC 201, INSERM, Lyon, France;10. Endocrine and Metabolic Function Exploration, Centre of Biology North, Croix-Rousse Hospital, Hospices Civils de Lyon, Lyon, France;11. Clinical Investigation Centre, CIC 201 Inserm and Department of Clinical Pharmacology, Hospices Civils de Lyon, Lyon, France; UMR 5558, CNRS, Villeurbanne, France; Claude Bernard Lyon 1 University, Lyon, France

Abstract:	We have studied the collective properties of two-dimensional (2D) excitons immersed within a quantum well which contains 2D excitons and a two-dimensional electron gas (2DEG). We have also analyzed the excitations for a system of 2D dipole excitons with spatially separated electrons and holes in a pair of quantum wells (CQWs) when one of the wells contains a 2DEG. Calculations of the superfluid density and the Kosterlitz–Thouless (K–T) phase transition temperature for the 2DEG-exciton system in a quantum well have shown that the K–T transition temperature increase with increasing exciton density and that it might be possible to have fast long-range transport of excitons. The superfluid density and the K–T transition temperature for dipole excitons in CQWs in the presence of a 2DEG in one of the wells increases with increasing inter-well separation.

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