4,436 research outputs found
Trimer-Monomer Mixture Problem on (111) Surface of Diamond Structure
We consider a system of trimers and monomers on the triangular lattice, which
describes the adsorption problem on (111) surface of diamond
structure. We give a mapping to a 3-state vertex model on the square lattice.
We treat the problem by the transfer-matrix method combined with the
density-matrix algorithm, to obtain thermodynamic quantities.Comment: 9 pages, 7 figures, PTPTeX ver. 1.0. To appear Progress of
Theoretical Physics, Jan. 2001. http://www2.yukawa.kyoto-u.ac.jp/~ptpwww/
(Full Access
Phase diagram of step faceting for sticky steps
A phase diagram for the step faceting phase, the step droplet phase, and the
Gruber-Mullins-Pokrovsky-Talapov (GMPT) phase on a crystal surface is obtained
by calculating the surface tension with the density matrix renormalization
group method. The model based on the calculations is the restricted
solid-on-solid (RSOS) model with a point-contact-type step-step attraction
(p-RSOS model) on a square lattice. The point-contact-type step-step attraction
represents the energy gain obtained by forming a bonding state with orbital
overlap at the meeting point of the neighbouring steps. Owing to the sticky
character of steps, there are two phase transition temperatures, and
. At temperatures , the anisotropic surface tension has a
disconnected shape around the (111) surface. At , the
surface tension has a disconnected shape around the (001) surface. On the (001)
facet edge in the step droplet phase, the shape exponent normal to the mean
step running direction at near , which is different
from the GMPT universal value . On the (111) facet edge,
only on . To understand how the system undergoes phase
transition, we focus on the connection between the p-RSOS model and the
one-dimensional spinless quasi-impenetrable attractive bosons at absolute zero.Comment: 26 pages, 15 figure
Link invariants from -state vertex models: an alternative construction independent of statistical models
We reproduce the hierarchy of link invariants associated to the series of
-state vertex models with a method different from the original construction
due to Akutsu, Deguchi and Wadati. The alternative method substitutes the
`crossing symmetry' property exhibited by the Boltzmann weights of the vertex
models by a similar property which, for the purpose of constructing link
invariants, encodes the same information but requires only the limit of the
Boltzmann weights when the spectral parameter is sent to infinity.Comment: 20 pages, LaTeX, uses epsf.sty. To appear in Nucl. Phys.
Gender discourse, awareness, and alternative responses for men in everyday living
In this paper, the authors use examples from their experiences to explore the nuances and complexities of contemporary gender practices. They draw on discourse and positioning theories to identify the ways in which culturally dominant, and difficult to notice, gender constructions help shape everyday experiences. In addition, the authors share their view that there are benefits in developing skills in noticing contemporary practices made available by dominant gender constructions. Such noticing expands possibilities for ways of responding and relating that might produce outcomes for men and women that fit with their hopes for living
Universal Asymptotic Eigenvalue Distribution of Density Matrices and the Corner Transfer Matrices in the Thermodynamic Limit
We study the asymptotic behavior of the eigenvalue distribution of the
Baxter's corner transfer matrix (CTM) and the density matrix (DM) in the
White's density-matrix renormalization group (DMRG), for one-dimensional
quantum and two-dimensional classical statistical systems. We utilize the
relationship which holds for non-critical systems in the
thermodynamic limit. Using the known diagonal form of CTM, we derive exact
asymptotic form of the DM eigenvalue distribution for the integrable
XXZ chain (and its related integrable models) in the massive regime. The result
is then recast into a ``universal'' form without model-specific quantities,
which leads to for -th DM
eigenvalue at larg . We perform numerical renormalization group calculations
(using the corner-transfer-matrix RG and the product-wavefunction RG) for
non-integrable models, verifying the ``universal asymptotic form'' for them.
Our results strongly suggest the universality of the asymptotic eigenvalue
distribution of DM and CTM for a wide class of systems.Comment: 4 pages, RevTeX, 4 ps figure
Numerical Renormalization Approach to Two-Dimensional Quantum Antiferromagnets with Valence-Bond-Solid Type Ground State
We study the ground-state properties of the two-dimensional quantum spin
systems having the valence-bond-solid (VBS) type ground states. The
``product-of-tensors'' form of the ground-state wavefunction of the system is
utilized to associate it with an equivalent classical lattice statistical model
which can be treated by the transfer-matrix method. For diagonalization of the
transfer matrix, we employ the product-wavefunction renormalization group
method which is a variant of the density-matrix renormalization group method.
We obtain the correlation length and the sublattice magnetization accurately.
For the anisotropically ``deformed'' S=3/2 VBS model on the honeycomb lattice,
we find that the correlation length as a function of the deformation parameter
behaves very much alike as that in the S=3/2 VBS chain.Comment: 9 pages and 11 non-embedded figures, REVTex, submitted to New Journal
of Physic
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