Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 80: Low-Dimensional Systems - Poster Session
TT 80.22: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P2
Incommensurate insulator and pairing in an asymmetric ladder system — •Anas Abdelwahab1, Eric Jeckelmann1, and Martin Hohenadler2 — 1Leibniz Universität Hannover — 2Universität Würzburg
We investigate a ladder system made of two inequivalent legs, a Hubbard chain and a free electron gas. Analytical approximations, density-matrix renormalization group, and continuous-time quantum Monte Carlo are used to determine ground-state properties such as correlation functions, gaps, and spectral functions of this system. At half filling and intermediate Hubbard on-site interaction we observe three different phases as a function of the inter-chain hopping. The system is a Luttinger liquid and a correlated band insulator at weak and strong inter-chain hopping, respectively. For intermediate inter-chain hopping we find an insulating phase with gap minima at incommensurate wave numbers. In this parameter regime and close to half filling doped particles have a significant binding energy but pairing correlations decay rapidly.