Spin-charge separation in two dimensions: A numerical study.
نویسندگان
چکیده
The question of spin-charge separation in two-dimensional lattices has been addressed by numerical simulations of the motion of one hole in a half-filled band. The calculations have been performed on finite clusters with Hubbard and t-J models. By comparing the time evolution of spin and charge polarisation currents in one and two dimensions, evidence in favor of spin-charge separation in two dimensions is presented. In contrast with this, spin-charge separation is absent in a highly doped, metallic, system. Typeset using REVTEX
منابع مشابه
Ring exchange, the exciton Bose liquid, and bosonization in two dimensions
Motivated by the high-Tc cuprates, we consider a model of bosonic Cooper pairs moving on a square lattice via ring exchange. We show that this model offers a natural middle ground between a conventional antiferromagnetic Mott insulator and the fully deconfined fractionalized phase that underlies the spin-charge separation scenario for high-Tc superconductivity. We show that such ring models sus...
متن کاملTransmittance through Aharonov-Bohm Rings: Signature of Spin-Charge Separation
We present numerical calculations concerning the phenomenon of spin-charge separation in low-dimensional strongly correlated electron systems. Specifically, we study the t-J model on a flux-threaded ring connected to semi-infinite free-electron leads. The transmittance through such an Aharonov-Bohm ring shows an interference pattern with characteristic sharp dips at certain flux values, determi...
متن کاملSpin-Charge Separated Luttinger Liquid in Arbitrary Spatial Dimensions
A model with a singular forward scattering amplitude for particles with opposite spins in d spatial dimensions is proposed and solved by using the bosonization transformation. This interacting potential leads to the spincharge separation. Thermal properties at low temperature for this Luttinger liquid are discussed. Also, the explicit form of the single-electron Green function is found; it has ...
متن کاملEvidence for Spin-Charge Separation in the Two-Dimensional t-J Model
We have calculated high temperature expansions for the momentum distribution function nk and the equal time spin and density correlation functions S(q) and N(q) of the two-dimensional t-J model. On extrapolation to low temperatures we find that nk has a step-like feature at kF and S(q) has 2kF as a characteristic wavevector, whereas N(q) has 2k F as a characteristic wavevector. Here kF and k SF...
متن کاملNonuniversal ordering of spin and charge in stripe phases.
We study the interplay of topological excitations in stripe phases: charge dislocations, charge loops, and spin vortices. In two dimensions these defects interact logarithmically on large distances. Using a renormalization-group analysis in the Coulomb-gas representation of these defects, we calculate the phase diagram and the critical properties of the transitions. Depending on the interaction...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review. B, Condensed matter
دوره 48 14 شماره
صفحات -
تاریخ انتشار 1993