Effect of the additional second neighbor hopping on the charge dynamics in the tJ model.pdf

Effect of the additional second neighbor hopping on the charge dynamics in the t-J model 2 0 Feng Yuan1 and Shiping Feng1,2,3 0 2 r 1Department of Physics, Beijing Normal University, Beijing 100875, China a M 2 The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, 7 Beijing Normal University, Beijing 100875, China 1 ] 3National Laboratory of Superconductivity, Academia Sinica, Beijing 100080, China l e - r t s . t Abstract a m - d The effect of the additional second neighbor hopping t′ on the charge dy- n o c namics of the t-J model in the underdoped regime is studied within the [ ′ 1 fermion-spin theory. The conductivity spectrum of the t-t -J model shows the v 5 low-energy peak and unusual midinfrared band, while the resistivity exhibits 4 3 a nearly temperature linear dependence with deviation at low temperature 3 0 2 in the underdoped regime. Although the qualitative feature of the charge 0 / ′ t dynamics in the t-t -J model is the same as in the case of the t-J model, the a m additional second neighbor hopping t′ leads to a clear shift of the position of - d n the midinfrared band to the higher energies in the conductivity spectrum, and o c suppress the range of the deviation from the temperature linear dependence : v i