The fluctuating gap model [Elektronische Ressource] / vorgelegt von Xiaobin Cao

The Fluctuating Gap ModelDissertationzurErlangung des Doktorgrades ( Dr. rer. nat. )derMathematisch-Naturwissenschaftlichen Fakult atderRheinischen Friedrich-Wilhelms-Universit at Bonnvorgelegt vonXiaobin CaoausJiangsu, ChinaBonn, January 2011Angefertigt mit Genehmigung der Mathematisch-Naturwissenschaftlichen Fakult at derRheinischen Friedrich-Wilhelms-Universit at Bonn1. Gutachter: Prof. Dr. Hartmut Monien2. Gutachter: Prof. Dr. Carsten UrbachTag der Promotion: 25.01.2011Erscheinungsjahr: 2011AbstractThe quasi-one-dimensional systems exhibit some unusual phenomenon, such as the Peierlsinstability [1], the pseudogap phenomena [2] and the absence of a Fermi-Dirac distributionfunction line shape in the photoemission spectroscopy [3]. Ever since the discovery ofmaterials with highly anisotropic properties, it has been recognized that uctuations playan important role above the three-dimensional phase transition. This regime where theprecursor uctuations are presented can be described by the so called uctuating gap model(FGM) which was derived from the Frohlich Hamiltonian to study the low energy physicsof the one-dimensional electron-phonon system.