46,845 research outputs found
Distribution and biological notes for some Cerambycidae (Coleoptera) occurring in the southeastern United States
New distribution records and new host records are provided for 33 species of Cerambycidae in Florida and Georgia
Crossover from ballistic to diffusive thermal transport in quantum Langevin dynamics study of a harmonic chain connected to self-consistent reservoirs
Through an exact analysis using quantum Langevin dynamics, we demonstrate the
crossover from ballistic to diffusive thermal transport in a harmonic chain
with each site connected to Ohmic heat reservoirs. The temperatures of the two
heat baths at the boundaries are specified from before whereas the temperatures
of the interior heat reservoirs are determined self-consistently by demanding
that in the steady state, on average, there is no heat current between any such
(self-consistent) reservoir and the harmonic chain. Essence of our study is
that the effective mean free path separating the ballistic regime of transport
from the diffusive one emerges naturally.Comment: 4 pages, 2 figur
Topological insulators in strained graphene at weak interaction
The nature of the electronic ground states in strained undoped graphene at
weak interaction between electrons is discussed. After providing a lattice
realization of the strain-induced axial magnetic field we numerically find the
self-consistent solution for the time reversal symmetry breaking quantum
anomalous Hall order-parameter, at weak second-nearest-neighbor repulsion
between spinless fermions. The anomalous Hall state is obtained in both uniform
and nonuniform axial magnetic fields, with the spatial profile of the
order-parameter resembling that of the axial field itself. When the electron
spin is included, the time reversal symmetric anomalous spin Hall state becomes
slightly preferred energetically at half filling, but the additional anomalous
Hall component should develop at a finite doping.Comment: 5.5 pages, 5 figures + Supplementary (2 pages + 5 figures), Added
discussion on chiral symmetry breaking ordering, New references, typos
corrected, Published versio
A global function for transcription factors in assisting RNA polymerase II termination.
The role of transcription factors (TFs) on nucleosome positioning, RNA polymerase recruitment, and transcription initiation has been extensively characterized. Here, we propose that a subset of TFs such as Reb1, Abf1, Rap1, and TFIIIB also serve a major function in partitioning transcription units by assisting the Nrd1p-Nab3p-Sen1p Pol II termination pathway
Integrated atomistic process and device simulation of decananometre MOSFETs
In this paper we present a methodology for the integrated atomistic process and device simulation of decananometre MOSFETs. The atomistic process simulations were carried out using the kinetic Monte Carlo process simulator DADOS, which is now integrated into the Synopsys 3D process and device simulation suite Taurus. The device simulations were performed using the Glasgow 3D statistical atomistic simulator, which incorporates density gradient quantum corrections. The overall methodology is illustrated in the atomistic process and device simulation of a well behaved 35 nm physical gate length MOSFET reported by Toshiba
Zero-modes and global antiferromagnetism in strained graphene
A novel magnetic ground state is reported for the Hubbard Hamiltonian in
strained graphene. When the chemical potential lies close to the Dirac point,
the ground state exhibits locally both the N\'{e}el and ferromagnetic orders,
even for weak Hubbard interaction. Whereas the N\'{e}el order parameter remains
of the same sign in the entire system, the magnetization at the boundary takes
the opposite sign from the bulk. The total magnetization this way vanishes, and
the magnetic ground state is globally only an antiferromagnet. This peculiar
ordering stems from the nature of the strain-induced single particle
zero-energy states, which have support on one sublattice of the honeycomb
lattice in the bulk, and on the other sublattice near the boundary of a finite
system. We support our claim with the self-consistent numerical calculation of
the order parameters, as well as by the Monte Carlo simulations of the Hubbard
model in both uniformly and non-uniformly strained honeycomb lattice. The
present result is contrasted with the magnetic ground state of the same Hubbard
model in the presence of a true magnetic field (and for vanishing Zeeman
coupling), which is exclusively N\'{e}el ordered, with zero local magnetization
everywhere in the system.Comment: Published version, 11+epsilon pages, 7 figures, added discussion on
experimental detection of Global Antiferromagne
A Z_3-graded generalization of supermatrices
We introduce Z_3-graded objects which are the generalization of the more
familiar Z_2-graded objects that are used in supersymmetric theories and in
many models of non-commutative geometry. First, we introduce the Z_3-graded
Grassmann algebra, and we use this object to construct the Z_3-matrices, which
are the generalizations of the supermatrices. Then, we generalize the concepts
of supertrace and superdeterminant
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