637 research outputs found
Effects of high order deformation on superheavy high- isomers
Using, for the first time, configuration-constrained potential-energy-surface
calculations with the inclusion of deformation, we find remarkable
effects of the high order deformation on the high- isomers in No,
the focus of recent spectroscopy experiments on superheavy nuclei. For shapes
with multipolarity six, the isomers are more tightly bound and,
microscopically, have enhanced deformed shell gaps at and . The
inclusion of deformation significantly improves the description of
the very heavy high- isomers.Comment: 5 pages, 4 figures, 1 table, the version to appear in Phys. Rev.
End to end distance on contour loops of random gaussian surfaces
A self consistent field theory that describes a part of a contour loop of a
random Gaussian surface as a trajectory interacting with itself is constructed.
The exponent \nu characterizing the end to end distance is obtained by a Flory
argument. The result is compared with different previuos derivations and is
found to agree with that of Kondev and Henley over most of the range of the
roughening exponent of the random surface.Comment: 7 page
Effective Field Theory of Triangular-Lattice Three-Spin Interaction Model
We discuss an effective field theory of a triangular-lattice three-spin
interaction model defined by the variables. Based on the
symmetry properties and the ideal-state graph concept, we show that the vector
dual sine-Gordon model describes the long-distance properties for ; we
then compare its predictions with the previous argument. To provide the
evidences, we numerically analyze the eigenvalue structure of the transfer
matrix for , and we check the criticality with the central charge of
the intermediate phase and the quantization condition of the vector charges.Comment: 4 pages, 3 figure
Correlated quantum percolation in the lowest Landau level
Our understanding of localization in the integer quantum Hall effect is
informed by a combination of semi-classical models and percolation theory.
Motivated by the effect of correlations on classical percolation we study
numerically electron localization in the lowest Landau level in the presence of
a power-law correlated disorder potential. Careful comparisons between
classical and quantum dynamics suggest that the extended Harris criterion is
applicable in the quantum case. This leads to a prediction of new localization
quantum critical points in integer quantum Hall systems with power-law
correlated disorder potentials. We demonstrate the stability of these critical
points to addition of competing short-range disorder potentials, and discuss
possible experimental realizations.Comment: 15 pages, 12 figure
Roughening Induced Deconstruction in (100) Facets of CsCl Type Crystals
The staggered 6-vertex model describes the competition between surface
roughening and reconstruction in (100) facets of CsCl type crystals. Its phase
diagram does not have the expected generic structure, due to the presence of a
fully-packed loop-gas line. We prove that the reconstruction and roughening
transitions cannot cross nor merge with this loop-gas line if these degrees of
freedom interact weakly. However, our numerical finite size scaling analysis
shows that the two critical lines merge along the loop-gas line, with strong
coupling scaling properties. The central charge is much larger than 1.5 and
roughening takes place at a surface roughness much larger than the conventional
universal value. It seems that additional fluctuations become critical
simultaneously.Comment: 31 pages, 9 figure
Elasticity of semiflexible polymers in two dimensions
We study theoretically the entropic elasticity of a semi-flexible polymer,
such as DNA, confined to two dimensions. Using the worm-like-chain model we
obtain an exact analytical expression for the partition function of the polymer
pulled at one end with a constant force. The force-extension relation for the
polymer is computed in the long chain limit in terms of Mathieu characteristic
functions. We also present applications to the interaction between a
semi-flexible polymer and a nematic field, and derive the nematic order
parameter and average extension of the polymer in a strong field.Comment: 16 pages, 3 figure
Efficiency of symmetric targeting for finite-T DMRG
Two targeting schemes have been known for the density matrix renormalization
group (DMRG) applied to non-Hermitian problems; one uses an asymmetric density
matrix and the other uses symmetric density matrix. We compare the numerical
efficiency of these two targeting schemes when they are used for the finite
temperature DMRG.Comment: 4 pages, 3 Postscript figures, REVTe
From chiral vibration to static chirality in ^{135}Nd
Electromagnetic transition probabilities have been measured for the intra-
and inter-band transitions in the two sequences in the nucleus ^{135}Nd that
were previously identified as a composite chiral pair of rotational bands. The
measurements are in good agreement with results of a new combination of TAC and
RPA calculations. The chiral character of the bands is affirmed and it is shown
that their behavior is associated with a transition from a vibrational into a
static chiral regime.Comment: Accepted for publication in the Physical Review Letters. Small
modifications to fit the length limits of the journal. 10 pages, 4 figure
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