Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-11-30
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 3 figures
Scientific paper
10.1103/PhysRevB.75.134520
We discuss a pseudospin representation of the two-dimensional t-J model. We introduce pseudospins associated with empty sites, deriving a new representation of the t-J model that consists of local spins and spinless fermions. We show, within a mean-field approximation, that our representation of t-J model corresponds to the {\it isotropic} antiferromagnetic Heisenberg model in an effective magnetic field. The strength and the direction of the effective field are determined by the hole doping ${\delta}$ and the orientation of pseudospins associated with empty sites, respectively. We find that the staggered magnetization in the standard representation corresponds to the component of magnetization perpendicular to the effective field in our pseudospin representation. Using a many-body Green's function method, we show that the staggered magnetization decreases with increasing hole doping ${\delta}$ and disappears at ${\delta \approx 0.06-0.15}$ for $t/J=2-5$. Our results are in good agreement with experiments and numerical calculations in contradistinction to usual mean-field methods.
Kurihara Susumu
Yamamoto Daisuke
No associations
LandOfFree
Antiferromagnetism in two-dimensional t-J model: pseudospin representation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Antiferromagnetism in two-dimensional t-J model: pseudospin representation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Antiferromagnetism in two-dimensional t-J model: pseudospin representation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-422599