Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bulk Entanglement Spectrum in Gapped Spin Ladders   We study the bulk entanglement of a series of gapped ground states of spin
ladders, representative of the Haldane phase. These ground states of spin $S/2$
ladders generalize the valence bond solid ground state. In the case of spin 1/2
ladders, we study a generalization of the Affleck-Kennedy-Lieb-Tasaki and
Nersesyan-Tsvelik states and fully characterize the bulk entanglement
Hamiltonian. In the case of general spin $S$ we argue that in the Haldane phase
the bulk entanglement spectrum of a half integer ladder is either gapless or
possess a degenerate ground state. For ladders with integer valued spin
particles, the generic bulk entanglement spectrum should have an entanglement
gap. Finally, we give an example of a series of trivial states of higher spin
$S>1$ in which the bulk entanglement Hamiltonian is critical, signaling that
the relation between topological states and a critical bulk entanglement
Hamiltonian is not unique to topological systems.

17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math