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Softening of roton and phonon modes in a Bose-Einstein condensate with spin-orbit coupling.
Using Bragg spectroscopy, a SO-coupled Bose-Einstein condensate of ^{87}Rb atoms is studied and it is shown that the excitation spectrum in a "magnetized" phase clearly possesses a two-branch and roton-maxon structure.
Realization of two-dimensional spin-orbit coupling for Bose-Einstein condensates
The realization of 2D SO coupling with advantages of small heating and topological stability opens a broad avenue in cold atoms to study exotic quantum phases, including topological superfluids.
Solutions of the Two-Dimensional Hubbard Model: Benchmarks and Results from a Wide Range of Numerical Algorithms
Numerical results for ground-state and excited-state properties (energies, double occupancies, and Matsubara-axis self-energies) of the single-orbital Hubbard model on a two-dimensional square
Uncover Topology by Quantum Quench Dynamics.
This work presents a new dynamical approach for ultracold-atom systems to uncover their band topology, and provides solid evidence to demonstrate its experimental advantages.
Collective dipole oscillations of a spin-orbit coupled Bose-Einstein condensate.
An experimental study of the collective dipole oscillation of a spin-orbit coupled Bose-Einstein condensate in a harmonic trap and experimentally demonstrates a unique feature of the spin- orbit coupled system predicted by a sum-rule approach, stating that spin polarization susceptibility can be measured via the dynamics of dipoles oscillation.
Percolation transitions in two dimensions.
The amplitude of the power-law correction associated with X_{t2}=4 is found to be dependent on the orientation of the lattice with respect to the cylindrical geometry of the finite systems.
Surface and bulk transitions in three-dimensional O(n) models.
Using Monte Carlo methods and finite-size scaling, surface criticality in the O(n) models on the simple-cubic lattice with n=1, 2, and 3 is investigated and substantial evidence for the existence of a special surface transition is found.
Cluster Monte Carlo simulation of the transverse Ising model.
A cluster Monte Carlo method is formulated for the anisotropic limit of Ising models on (d+1)-dimensional lattices, which in effect, are equivalent with d-dimensional quantum transverse Isingmodels, which improves significantly on earlier analyses.
Spin-Ice State of the Quantum Heisenberg Antiferromagnet on the Pyrochlore Lattice.
We study the low-temperature physics of the SU(2)-symmetric spin-1/2 Heisenberg antiferromagnet on a pyrochlore lattice and find "fingerprint" evidence for the thermal spin-ice state in this
Ferromagnetic phase transition for the spanning-forest model (q-->0 limit of the Potts model) in three or more dimensions.
We present Monte Carlo simulations of the spanning-forest model (q-->0 limit of the ferromagnetic Potts model) in spatial dimensions d=3, 4, 5. We show that, in contrast to the two-dimensional case,