Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 1: Correlated Electrons: Low-dimensional Systems - Models 1
TT 1.7: Vortrag
Montag, 26. März 2012, 11:00–11:15, H 0104
Fractionalization of Fractionalized Charges in the 1D t-J Model — •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 [1] of the model and the excitation content of each phase. The real time dynamics of a low-energy electron added to the system can be described by right and left propagating fractional excitation predicted by the Luttinger Liquid theory (LL) [2]. However, at higher energies the dynamics reveals one more level of fractionalization of the already fractional LL excitation. This new kind of fractionalization is also visible in the one-particle spectral function obtained in a previous quantum Monte Carlo simulation [3] where the branches were assigned to a spinon, a holon, and an antiholon, as in the supersymmetric t-J model with 1/r2 exchange [4]. By switching an electric field, we aim at identifying the charge of the fractionalized elementary excitations that result from the electron.
A. Moreno, A. Muramatsu and S. Manmana, Phys. Rev. B 83, 205113 (2011).
K.-V. Pham, M. Gabay, and P. Lederer, Phys. Rev. B 61, 16397(2000).
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).