Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bridging lattice-scale physics and continuum field theory with quantum
  Monte Carlo simulations   We discuss designer Hamiltonians---lattice models tailored to be free from
sign problems ("de-signed") when simulated with quantum Monte Carlo methods but
which still host complex many-body states and quantum phase transitions of
interest in condensed matter physics. We focus on quantum spin systems in which
competing interactions lead to non-magnetic ground states. These states and the
associated quantum phase transitions can be studied in great detail, enabling
direct access to universal properties and connections with low-energy effective
quantum field theories. As specific examples, we discuss the transition from a
Neel antiferromagnet to either a uniform quantum paramagnet or a spontaneously
symmetry-broken valence-bond solid in SU(2) and SU(N) invariant spin models. We
also discuss anisotropic (XXZ) systems harboring topological Z2 spin liquids
and the XY* transition. We briefly review recent progress on quantum Monte
Carlo algorithms, including ground state projection in the valence-bond basis
and direct computation of the Renyi variants of the entanglement entropy.

19
The categories of this paper are: eess
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph