Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 62: CE: Low-dimensional Systems - Models 2
TT 62.7: Vortrag
Freitag, 18. März 2011, 12:15–12:30, HSZ 105
The 1-D t-J model in and out of equilibrium — •Alexander Moreno and Alejandro Muramatsu — Institut für Theoretische Physik III, Universität Stuttgart, Germany
On the basis of the density matrix renormalization group (DMRG) we study the
ground-state phase diagram of the model and the excitation content of each
phase. As a first step, we determine the transition lines between a repulsive Luttinger liquid (LL) phase, an attractive LL phase, a spin-gap
(Luther-Emery - LE) phase, and phase-separation. In particular, we resolve a
controversy about the extension of the LE phase, and show evidence for
real-space pairing deep in that phase. By switching an electric field after the creation of an electron in the system, we aim at identifying the charge of the fractionalized elementary excitations that result from the electron. A previous quantum Monte Carlo simulation of the model [1] revealed that the spectral content of the electron addition spectrum could be accounted for by a spinon, a holon, and an antiholon, as in the supersymmetric 1/r2 t-J model [2]. These excitations have respectively S=1/2, Q=0; S=0, Q=−e; and S=0, Q=2e, where e is the charge of the electron.
C. Lavalle, M. Arikawa, S. Capponi, F. F. Assaad, and A. Muramatsu, Phys. Rev. Lett. 90, 216401 (2003).
M. Arikawa, Y. Saiga, and Y. Kuramoto, Phys. Rev. Lett. 86, 3096 (2001).