467 research outputs found
Polar Molecules with Three-Body Interactions on the Honeycomb Lattice
We study the phase diagram of ultra-cold bosonic polar molecules loaded on a
two-dimensional optical lattice of hexagonal symmetry controlled by external
electric and microwave fields. Following a recent proposal in Nature Physics
\textbf{3}, 726 (2007), such a system is described by an extended Bose-Hubbard
model of hard-core bosons, that includes both extended two- and three-body
repulsions. Using quantum Monte-Carlo simulations, exact finite cluster
calculations and the tensor network renormalization group, we explore the rich
phase diagram of this system, resulting from the strongly competing nature of
the three-body repulsions on the honeycomb lattice. Already in the classical
limit, they induce complex solid states with large unit cells and macroscopic
ground state degeneracies at different fractional lattice fillings. For the
quantum regime, we obtain effective descriptions of the various phases in terms
of emerging valence bond crystal states and quantum dimer models. Furthermore,
we access the experimentally relevant parameter regime, and determine the
stability of the crystalline phases towards strong two-body interactions
Direct and indirect costs in the conservative management of undisplaced scaphoid fractures
The scaphoid is the most commonly fractured carpal bone, and preferable treatment of undisplaced fractures is controversial. In order to assess the socio-economic impact of treatment modalities, we analysed the cost of conservative management of 54 undisplaced scaphoid fractures. Global costs amounted to 14.077 Swiss francs (9385 euros) per patient. Direct costs represent only 10% of global costs. No significant correlation was found between costs and timing of diagnosis, hand dominance or complications. Thirty-four percent of patients were able to resume their job with the wrist immobilised without complication, but at an obvious impact on indirect and global costs. If early resumption of professional activities during conservative treatment of undisplaced scaphoid fractures does not impair successful fracture healing, patients should be encouraged to return to work as early as possible, as is routinely done after percutaneous fracture fixation. This will contribute to massively reducing the cost of conservative treatmen
Mycobacterium marinum: MR imaging and clinical course of a rare soft tissue infection
Mycobacterium marinum is a rare cause of soft tissue infections. The imposing MR appearance of the soft tissue involvement is in contrast to the chronic painless clinical manifestatio
Memory-augmented Dense Predictive Coding for Video Representation Learning
The objective of this paper is self-supervised learning from video, in
particular for representations for action recognition. We make the following
contributions: (i) We propose a new architecture and learning framework
Memory-augmented Dense Predictive Coding (MemDPC) for the task. It is trained
with a predictive attention mechanism over the set of compressed memories, such
that any future states can always be constructed by a convex combination of the
condense representations, allowing to make multiple hypotheses efficiently.
(ii) We investigate visual-only self-supervised video representation learning
from RGB frames, or from unsupervised optical flow, or both. (iii) We
thoroughly evaluate the quality of learnt representation on four different
downstream tasks: action recognition, video retrieval, learning with scarce
annotations, and unintentional action classification. In all cases, we
demonstrate state-of-the-art or comparable performance over other approaches
with orders of magnitude fewer training data.Comment: ECCV2020, Spotligh
Dressing of Ultracold Atoms by their Rydberg States in a Ioffe-Pritchard Trap
We explore how the extraordinary properties of Rydberg atoms can be employed
to impact the motion of ultracold ground state atoms. Specifically, we use an
off-resonant two-photon laser dressing to map features of the Rydberg states on
ground state atoms. It is demonstrated that the interplay between the spatially
varying quantization axis of the considered Ioffe-Pritchard field and the fixed
polarizations of the laser transitions provides the possibility of
substantially manipulating the ground state trapping potential.Comment: 11 pages, 4 figure
Dissipative Dynamics of a Josephson Junction In the Bose-Gases
The dissipative dynamics of a Josephson junction in the Bose-gases is
considered within the framework of the model of a tunneling Hamiltonian. The
effective action which describes the dynamics of the phase difference across
the junction is derived using functional integration method. The dynamic
equation obtained for the phase difference across the junction is analyzed for
the finite temperatures in the low frequency limit involving the radiation
terms. The asymmetric case of the Bose-gases with the different order
parameters is calculated as well
Designing spin-1 lattice models using polar molecules
We describe how to design a large class of always on spin-1 interactions
between polar molecules trapped in an optical lattice. The spin degrees of
freedom correspond to the hyperfine levels of a ro-vibrational ground state
molecule. Interactions are induced using a microwave field to mix ground states
in one hyperfine manifold with the spin entangled dipole-dipole coupled excited
states. Using multiple fields anistropic models in one, two, or three
dimensions, can be built with tunable spatial range. An illustrative example in
one dimension is the generalized Haldane model, which at a specific parameter
has a gapped valence bond solid ground state. The interaction strengths are
large compared to decoherence rates and should allow for probing the rich phase
structure of strongly correlated systems, including dimerized and gapped
phases.Comment: 24 pages, 5 figure
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