We consider XY-spin degrees of freedom on an fcc lattice, such that the system respects some subsystem global symmetry. We then gauge this global symmetry and study the corresponding
U(1) gauge theory on the fcc lattice. Surprisingly, this
U(1) gauge theory is dual to the original spin system. We also analyze a similar
ZN gauge theory on that lattice. All these systems are fractonic. The
U(1) theories are gapless and the
ZN theories are gapped. We analyze the continuum limits of all these systems and present free continuum Lagrangians for their low-energy physics. Our
Z2 fcc gauge theory is the continuum limit of the well-known checkerboard model of fractons. Our continuum analysis leads to a straightforward proof of the known fact that this theory is dual to two copies of the
Z2 X-cube model. We find new models and new relations between known models. The
ZN fcc gauge theory can be realized by coupling three copies of an anisotropic model of lineons and planons to a certain exotic
Z2 gauge theory. Also, although for
N=2 this model is dual to two copies of the
Z2 X-cube model, a similar statement is not true for higher
N.
While the existence of a chiral spin liquid (CSL) on a class of spin-1/2 kagome antiferromagnets is by now well established numerically, a controlled theoretical path from the lattice model leading to a low-energy topological field theory is still lacking. This we provide via an explicit construction starting from reformulating a microscopic model for a CSL as a lattice gauge theory and deriving the low-energy form of its continuum limit. A crucial ingredient is the realization that the bosonic spinons of the gauge theory exhibit a U(1) symmetry protected topological (SPT) phase, which upon promoting its U(1) global symmetry to a local gauge structure ("gauging"), yields the CSL. We suggest that such an explicit lattice-based construction involving gauging of a SPT phase can be applied more generally to understand topological spin liquids.
Ising, Heisenberg and Hubbard models in relation to insulating and metallic ferro- and antiferro-magnets studies of lattice spin systems using series expansions application of linked-cluster expansions to quantum Hamiltonian lattice systems critical properties of 1-D spin 1/2 antiferro-magnetic Heisenberg model the Z(2) lattice gauge vacuum and the transverse Ising model crystallographic point and space group symmetries in correlated many-body wave functions Hamiltonian lattice calculations on gauge and chiral meson field theories.