43,341 research outputs found
Supersolid Phase of Cold Fermionic Polar Molecules in 2D Optical Lattices
We study a system of ultra-cold fermionic polar molecules in a
two-dimensional square lattice interacting via both the long-ranged
dipole-dipole interaction and a short-ranged on-site attractive interaction.
Singlet superfluid, charge density wave, and supersolid phases are found to
exist in the system. We map out the zero temperature phase diagram and find
that the supersolid phase is considerably stabilized by the dipole-dipole
interaction and thus can exist over a large region of filling factors. We study
the melting of the supersolid phase with increasing temperature, map out a
finite temperature phase diagram of the system at fixed filling, and determine
the parameter region where the supersolid phase can possibly be observed in
experiments.Comment: 8 pages, 5 figure
Learning Symmetric Collaborative Dialogue Agents with Dynamic Knowledge Graph Embeddings
We study a symmetric collaborative dialogue setting in which two agents, each
with private knowledge, must strategically communicate to achieve a common
goal. The open-ended dialogue state in this setting poses new challenges for
existing dialogue systems. We collected a dataset of 11K human-human dialogues,
which exhibits interesting lexical, semantic, and strategic elements. To model
both structured knowledge and unstructured language, we propose a neural model
with dynamic knowledge graph embeddings that evolve as the dialogue progresses.
Automatic and human evaluations show that our model is both more effective at
achieving the goal and more human-like than baseline neural and rule-based
models.Comment: ACL 201
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