Condensed Matter Physics Seminar

Speaker: Alexander Kemper, North Carolina State University

Title: Assumptions and Realities in Non-Equilibrium Many-Body Physics

Refreshments available at 3:45 pm.

Date: Mon, 29 Oct 2018, 4:10 pm – 5:10 pm
Type: Seminar
Location: 1400 BPS Bldg.

Abstract:
In this talk, I will present an over­view of some of our recent re­sults in the area of non-equi­librium many-body theory. Experi­mental develop­ments are enabling the study of elec­trons and atoms in the time do­main with ever in­creas­ing resolu­tion. The theo­retical develop­ment has been some­what lack­ing, and re­mains mostly rooted in exten­sions of equi­libri­um models. I will dis­cuss a series of assump­tions that under­lie com­mon modes of think­ing about non-equi­libri­um many-body physics such as N-tem­pera­ture models, separa­tion of time scales based on energy scales, and Mathies­sen's rule, which says that inter­ac­tion channels add linear­ly. Based on our nu­meri­cal solu­tion of the equa­tions of mo­tion in the time do­main, I will demon­strate by con­tra­dic­tion that these assump­tions and models are not general­ly valid, but have lim­ited ranges of applic­abil­ity, and I will pre­sent real­ities of non-equi­libri­um many-body theory that should be taken into ac­count when con­sider­ing time do­main physics.