Abstract
Using grand-canonical quantum Monte-Carlo (QMC) simulations combined with maximum entropy (MaxEnt) analytic continuation, as well as analytical methods, we examine the one- and two-particle dynamical properties of the Hubbard model on two coupled chains at small doping. For large values of the interchain coupling t ⊥ ⪆ 2t the local rung approximation (LRA) developed for the half-filled case describes the high-energy features of the system. In addition, in the bonding charge channel a pronounced gapless mode is observed, which indicates the insulator-metal transition. The main features of the quasi-particle dispersion are found unchanged (“rigid-band like”) when going to smaller (isotropic) couplings and intermediate dopings.
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