Many-body properties of a disordered charged Bose gas superlattice |
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| Institution: | 1. Department of Teacher Education/Rauma Unit, University of Turku, Seminaarinkatu 1, FI-26101 Rauma, Finland;2. Centre for Learning Research, University of Turku, 20014 Turku, Finland;3. Department of Neurobiology, AIV Institute, Faculty of Health Sciences, University of Eastern Finland, P.O. Box 1627 (street address: Neulaniementie 2), FI-70211 Kuopio, Finland;4. Department of Psychology, University of Jyväskylä, P.O. Box 35 (street address: Ylistönmäentie 33), FI-40014 Jyväskylä, Finland;1. Graduate School of Biomedical Engineering, University of Texas at San Antonio, USA;2. Department of Ophthalmology, University of Texas Health Science Center, USA;3. Research Imaging Institute, University of Texas Health Science Center, USA;4. Department of Pharmacology, University of Texas Health Science Center, USA;5. South Texas Veterans Health Care System, Department of Veterans Affairs, San Antonio, TX, USA |
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| Abstract: | We study some many-body properties of a disordered charged Bose gas (CBG) superlattice—an infinite array of CBG layers each of which containing disorder. The latter is assumed to cause collisions with the charged bosons, the effect of collisions being taken into account through a number-conserving relaxation time approximation incorporated within the random phase approximation (RPA) at T = 0. We go beyond the RPA and include a local-field correction G(q, qz) which is assumed to be collision independent, as an approximation. The resulting density–density correlation function is then used to calculate a number of many-body quantities of physical interest, e.g. (a) collective modes, (b) static structure factor, (c) energy-loss function, (d) plasmon density of states, and (e) ground-state energy. The effects of collisions on these quantities are discussed, and the results are compared with the corresponding results for an electron gas superlattice. |
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