Boundary bound states for the open Hubbard chain with boundary fields
نویسندگان
چکیده
The boundary effects in the open Hubbard chain with boundary fields are studied. The boundary string solutions of the Bethe ansatz equations that give rise to a wave functions localized at the boundary and exponentially decreasing away from the boundary are provided. In particular, it is shown that the correct ground state of the model at half-filling contains the boundary 1-string.
منابع مشابه
Boundary S matrices for the open Hubbard chain with boundary fields
Using the method introduced by Grisaru et al., boundary S matrices for the physical excitations of the open Hubbard chain with boundary fields are studied. In contrast to the open supersymmetric t-J model, the boundary S matrix for the charge excitations depend on the boundary fields though the boundary fields do not break the spin-SU(2) symmetry. E-mail address: [email protected]
متن کاملExact solutions of 1-D Hubbard model with open boundary conditions and the conformal dimensions under boundary magnetic fields
The Bethe ansatz equations of the 1-D Hubbard model under open boundaryconditions are systematically derived by diagonalizing the inhomogeneous trans-fer matrix of the XXX model with open boundaries. Through the finite-sizecorrection, we obtain the energy spectrum of the open chain and discuss the ef-fects of boundary magnetic fields applied only at the edges of the chain. S...
متن کاملThe Supersymmetric t-J Model with a Boundary
An open supersymmetric t-J chain with boundary fields is studied by means of the Bethe Ansatz. Ground state properties for the case of an almost half-filled band and a bulk magnetic field are determined. Boundary susceptibilities are calculated as functions of the boundary fields. The effects of the boundary on excitations are investigated by constructing the exact boundary S-matrix. From the a...
متن کاملSurface excitations and surface energy of the antiferromagnetic XXZ chain by the Bethe ansatz approach
We study boundary bound states using the Bethe ansatz formalism for the open XXZ (1 > 1) chain in a boundary magnetic field h. Boundary bound states are represented by the ‘boundary strings’ similar to those described in Skorik and Saleur. We find that for certain values of h the ground-state wavefunction contains boundary strings and from this infer the existence of two ‘critical’ fields in ag...
متن کاملA gapless charge mode induced by the boundary states in the half-filled Hubbard open-chain
We discuss the ground state and some excited states of the half-filled Hubbard model defined on an open chain with L sites, where onlyone of the boundary sites has a different value of chemical potential.We consider the case when the boundary site has a negative chemicalpotential −p and the Hubbard coupling U is positive. By an analyticmethod we show that when p is large...
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:
دوره شماره
صفحات -
تاریخ انتشار 1997