Dynamical Singularities of Floquet Higher-Order Topological Insulators.
This work establishes a systematic route to construct and characterize Floquet higher-order topological phases by introducing dynamical topological invariants from the full unitary return map and showing its phase bands contain Weyl singularities whose topological charges form dynamical multipole moments in the Brillouin zone.
Orbital order in Mott insulators of spinless p-band fermions.
A gas of strongly interacting single-species (spinless) p-orbital fermionic atoms in 2D optical lattices is proposed and studied and the orbital ordering on the kagome lattice is determined, and it is shown how orbital wave fluctuations select ground states via the order by disorder mechanism for the honeycomb lattice.
Topological semimetal in a fermionic optical lattice
Experimental progress has made it possible to load fermionic atoms into higher orbital bands. Such systems provide a platform for studying quantum states of matter that have no prior analogues in…
Floquet Higher-Order Topological Insulators with Anomalous Dynamical Polarization.
Floquet driving is incorporated into HOTIs, and for the first time a dynamical polarization theory with anomalous nonequilibrium multipoles is reported, and a proposal to detect not only corner states but also their dynamical origin in cold atoms is demonstrated.
Atomic matter of nonzero-momentum Bose-Einstein condensation and orbital current order
The paradigm of Bose-Einstein condensation has been associated with zero momentum to which a macroscopic fraction of bosons condense. Here we propose a new quantum state where bosonic alkali-metal…
Stability criteria for breached-pair superfluidity.
We present simple, concrete, two-fermion models that exhibit thermodynamically stable isotropic translationally invariant gapless superfluid states (breached-pair superfluidity). The mass ratio…
Time-reversal symmetry breaking of p-orbital bosons in a one-dimensional optical lattice.
It is discovered that the quantum noise measurement is able to provide a concrete evidence of time-reversal symmetry breaking in the first Mott phase.
Parity breaking and phase transition induced by a magnetic field in high Tc superconductors
- W. Liu
- 12 August 1998
Interior gap superfluidity.
A new state of matter is proposed in which the pairing interactions carve out a gap within the interior of a large Fermi ball, while the exterior surface remains gapless, which would define a material that is simultaneously superconducting and metallic.
Breached pairing superfluidity: possible realization in QCD.
A wide universality class of gapless superfluids is proposed, and a limit that might be realized in quark matter at intermediate densities is analyzed, predicting a second-order phase transition from the breached pairing phase to the conventional color-flavor locked phase.