1,093 research outputs found
Loop optimization for tensor network renormalization
We introduce a tensor renormalization group scheme for coarse-graining a
two-dimensional tensor network that can be successfully applied to both
classical and quantum systems on and off criticality. The key innovation in our
scheme is to deform a 2D tensor network into small loops and then optimize the
tensors on each loop. In this way, we remove short-range entanglement at each
iteration step and significantly improve the accuracy and stability of the
renormalization flow. We demonstrate our algorithm in the classical Ising model
and a frustrated 2D quantum model.Comment: 15 pages, 11 figures, accepted version for Phys. Rev. Let
Top quark spin and interaction in charged Higgs and top quark associated production at LHC
We study the charged Higgs production at LHC via its associated production
with top quark. The kinematic cuts are optimized to suppress the background
processes so that the reconstruction of the charged Higgs and top quark is
possible. The angular distributions with respect to top quark spin are explored
to study the interaction at LHC.Comment: 10 pages,5 figures, to appear in PR
Topological flat band models with arbitrary Chern numbers
We report the theoretical discovery of a systematic scheme to produce
topological flat bands (TFBs) with arbitrary Chern numbers. We find that
generically a multi-orbital high Chern number TFB model can be constructed by
considering multi-layer Chern number C=1 TFB models with enhanced translational
symmetry. A series of models are presented as examples, including a two-band
model on a triangular lattice with a Chern number C=3 and an -band square
lattice model with for an arbitrary integer . In all these models, the
flatness ratio for the TFBs is larger than 30 and increases with increasing
Chern number. In the presence of appropriate inter-particle interactions, these
models are likely to lead to the formation of novel Abelian and Non-Abelian
fractional Chern insulators. As a simple example, we test the C=2 model with
hardcore bosons at 1/3 filling and an intriguing fractional quantum Hall state
is observed.Comment: 8 pages, 7 figure
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