Regensburg 2000 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Tiefe Temperaturen
TT 22: Postersitzung III: Supraleitende Anwendungen (1-4) Massive HTSL, Bandleiter, Filme (5-26), Transport in HTSL (27-30), Elektronenstruktur in Supraleitern (31-43), Borkarbide (44-50), Quantenphasen- und Metall-Isolator-Überg
änge (51-69)
TT 22.60: Poster
Donnerstag, 30. März 2000, 14:00–17:30, A
Numerical results for two interacting particles in a 2D random environment — •R.A. Römer1, M. Leadbeater2, and M. Schreiber1 — 1Institut für Physik, Technische Universität, D-09107 Chemnitz — 2Dipartimento di Fisica, Univ. di Roma Tre, Via delle Vasca Navale 84, I-00146 Roma, Italy
Much evidence has been collected to date which shows that repulsive electron-electron interaction can lead to the formation of particle pairs in a one-dimensional random energy landscape. The localization length λ2 of these pair states is finite, but larger than the localization length λ1 of the individual particles. Here we present numerical evidence for this effect based on an analysis of the interaction matrix elements and an application of the decimation method. The results based on the decimation method for a two-dimensional disordered medium support the localization-delocalization transition of pair states predicted recently.