Aspects of quantum entanglement in critical and topologically ordered systems

Quantum entanglement plays an important role in characterizing the property of many-body systems and quantum field theories. In this thesis, we study the quantum entanglement in (1+1)-dimensional critical systems and (2+1)-dimensional topologically ordered phases. For (1+1)-d critical systems, we mainly study the non-equilibrium property of quantum entanglement, by focusing on three interesting cases: (i) the time evolution of entanglement hamiltonian during thermalization of a subsystem after a global quantum quench; (ii) time evolution of entanglement entropy after an inhomogeneous quantum quench; (iii) entanglement negativity evolution after a local quantum quench. For (2+1)-d topologically ordered phases, we use edge theory approach to study the topological entanglement entropy, mutual information and entnanglement negativity of Chern-Simons theories, which are further confirmed based on the surgey approach. In addition, we study the entanglement renormalization of topological insulators, and investigate the geometric and topological properties in the bulk of entanglement renormalization.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2017

Author dc:creator

• Wen, Xueda

Contributors dc:contributor

• Ryu, Shinsei
• Hughes, Taylor
• Eckstein, James
• DeMarco, Brian

• Entanglement
• Critical systems
• Topologically ordered systems

Statement dc:rights

• Copyright 2017 Xueda Wen

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/98200

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/98200