Dynamic spin response for Heisenberg ladders
نویسندگان
چکیده
منابع مشابه
Dynamical spin response functions for Heisenberg ladders
We present the results of a numerical study of the 2 3L spin1 2 Heisenberg ladder. Ground state energies and the singlet-triplet energy gaps for 4<L<14 and J' /J uu 5 1 were obtained in a Lanczos calculation and checked against earlier calculations by Barnes et al. ~even L< 12!. A related moments technique is then employed to evaluate spin response functions for L 5 12 and a range of J' /J uu ~...
متن کاملEntanglement Spectra of Heisenberg Ladders of higher Spin
We study the entanglement spectrum of Heisenberg spin ladders of arbitrary spin length S in the perturbative regime of strong rung coupling. For isotropic spin coupling the the entanglement spectrum is, within first order perturbation theory, always proportional to the energy spectrum of the single chain with a proportionality factor being also independent of S. A more complicated situation ari...
متن کاملDiverging Heisenberg spin ladders: ground state and low energy excitations.
We consider a two-leg ladder system with interactions varying from constant rung coupling to systematic diminishing of rung interactions leading to diverging chains. We compare and contrast their ground state and excitation characteristics using density matrix renormalization group methods. We find that the finite spin gap in a constant coupling ladder develops into a gapless excitation with sl...
متن کاملEntanglement spectra of quantum Heisenberg ladders.
Bipartite entanglement measures are surprisingly useful tools to investigate quantum phases of correlated electrons. Here, I analyze the entanglement spectrum of gapped two-leg quantum Heisenberg ladders on a periodic ribbon partitioned into two identical periodic chains. The entanglement spectrum closely reflects the low-energy gapless spectrum of each individual edge. This extends the conject...
متن کاملWeakly disordered spin ladders
We analyze an anisotropic spin 1/2 two legs ladder in the presence of various type of random perturbations. The generic phase diagram for the pure system, in a way similar to spin one chains, consists of four phases: an Antiferromagnet, a Haldane gap or a Singlet phase (depending on the sign of interchain coupling) and two XY phases designated by XY1 and XY2. The effects of disorder depend cruc...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review B
سال: 1998
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.57.10260