Edge Theories in Projected Entangled Pair State Models

Autor(en)

S. Yang, L. Lehman, D. Poilblanc, K. Van Acoleyen, F. Verstraete, J. I. Cirac, N. Schuch

Abstrakt

We analyze the low energy excitations of spin lattice systems in two dimensions at zero temperature within the framework of projected entangled pair state models. Perturbations in the bulk give rise to physical excitations located at the edge. We identify the corresponding degrees of freedom, give a procedure to derive the edge Hamiltonian, and illustrate that it can exhibit a rich phase diagram. For topological models, the edge Hamiltonian is constrained by the topological order in the bulk, which gives rise to one-dimensional edge models with unconventional properties; for instance, a topologically ordered bulk can protect a ferromagnetic Ising chain at the edge against spontaneous symmetry breaking.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Rheinisch-Westfälische Technische Hochschule Aachen, Université Toulouse III Paul Sabatier, Ghent University , Max-Planck-Institut für Quantenoptik

Journal

Physical Review Letters

Band

112

Anzahl der Seiten

5

ISSN

0031-9007

DOI

https://doi.org/10.1103/PhysRevLett.112.036402

Publikationsdatum

01-2014

Peer-reviewed

Ja

ÖFOS 2012

103036 Theoretische Physik, 103026 Quantenoptik

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/fa9adf19-6461-4254-9645-a170d241dbf8