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Quantum Theory Seminar -Average symmetry-protected topological phases: the decohered, the disordered, and the intrinsic - Jian-Hao Zhang (Penn State)

Friday, September 8, 2023 at 3:30pm to 4:30pm

142 Sciences Drive, Physical Sciences Building Rm 403 142 Sciences Dr.

Average symmetry-protected topological phases: the decohered, the disordered, and the intrinsic

Symmetry-protected topological (SPT) phases have attracted significant attention in the field of condensed matter physics due to their remarkable properties, such as the presence of protected edge or surface modes. Although substantial progress has been made in understanding these phases in ideal, isolated systems at zero temperature, their behavior under non-ideal conditions involving measurement, decoherence, or disorder presents a challenging area of study. In this talk, a  new concept known as "averaged symmetry-protected topological phases" will be introduced. These phases exist within mixed ensembles where individual states break part of the protecting symmetry, but the symmetry is restored upon ensemble averaging. We will explore the physical properties and classification schemes for these unique phases. Additionally, we will introduce the notion of a "strange correlator" as a theoretical and numerical tool for detecting these phases.

Faculty Hosts: Eun-Ah Kim and Debanjan Chowdhury

Streaming site:

https://www.youtube.com/@quantumtheoryseminar6651/streams

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Event Type

Seminar

Departments

LASSP

University Themes

Research

Tags

lassp, quantum_site, quantum_theory, quantum_lassp

Cost

Free

Contact E-Mail

lassp-seminars@cornell.edu

Contact Name

Meredith Collins

Speaker

Jian-Hao Zhang

Speaker Affiliation

Penn State University

Dept. Web Site

https://www.lassp.cornell.edu/

Disability Access Information

If you need accommodations to participate in this event, please contact us as soon as possible.

Open To

Open to the Public

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