Originally, the Hubbard model was derived for describing the behavior of strongly correlated
electrons in solids. However, for over a decade now, variations of it have also routinely been …

The orbital degree of freedom plays a fundamental role in understanding the unconventional
properties in solid state materials. Experimental progress in quantum atomic gases has …

Interorbital coupling refers to the possibility of exciting orbital states by otherwise orthogonal
noninteracting modes, a forbidden process in photonic lattices due to intrinsic propagation …

Theory anticipates that the in-plane px, py orbitals in a honeycomb lattice lead to potentially
useful quantum electronic phases. So far, p orbital bands were only realized for cold atoms …

Artificial electronic lattices, created atom by atom in a scanning tunneling microscope, have
emerged as a highly tunable platform to realize and characterize the lowest-energy bands of …

Research on graphene has revealed remarkable phenomena arising in the honeycomb
lattice. However, the quantum spin Hall effect predicted at the K point could not be observed …

Topological states of matter are peculiar quantum phases showing different edge and bulk
transport properties connected by the bulk-boundary correspondence. While noninteracting …

The breaking of time-reversal symmetry via the spontaneous formation of chiral order is
ubiquitous in nature. Here, we present an unambiguous demonstration of this phenomenon …

This article provides a synopsis of our recent experimental work exploring Bose–Einstein
condensation in metastable higher Bloch bands of optical lattices. Bipartite lattice …

We study the topological properties of elementary excitations in a staggered px±ipy Bose-
Einstein condensate realized in recent orbital optical lattice experiments. The condensate …