< 2021 >
April 8
  • 08
    April 8, 2021

    CMSA Math Science Literature Lecture Series

    9:00 AM-10:30 AM
    April 8, 2021

    TITLE: Quantum error correcting codes and fault tolerance

    ABSTRACT: We will go over the fundamentals of quantum error correction and fault tolerance and survey some of the recent developments in the field.

    Talk chair: Zhengwei Liu

    Written articles will accompany each lecture in this series and be available as part of the publication “History and Literature of Mathematical Science.”

    For more information, please visit the event page.

    Register here to attend.

    CMSA Interdisciplinary Science Seminar: Supergeometry and Super Riemann Surfaces of Genus Zero

    12:00 PM-1:00 PM
    April 8, 2021

    Supergeometry is a mathematical theory of geometric spaces with anti-commuting coordinates and functions which is motivated by the concept of supersymmetry from theoretical physics. I will explain the functorial approach to supermanifolds by Molotkov and Sachse. Super Riemann surfaces are an interesting supergeometric generalization of Riemann surfaces. I will present a differential geometric approach to their classification in the case of genus zero and with Neveu-Schwarz punctures.


    (Password: 419419)

    CMSA Quantum Matter in Mathematics and Physics: Chiral edge modes, thermoelectric transport, and the Third Law of Thermodynamics

    1:00 PM-2:30 PM
    April 8, 2021

    In this talk, I will discuss several issues related to thermoelectric transport, with application to topological invariants of chiral topological phases in two dimensions. In the first part of the talk, I will argue in several different ways that the only topological invariants associated with anomalous edge transport are the Hall conductance and the thermal Hall conductance. Thermoelectric coefficients are shown to vanish at zero temperature and do not give rise to topological invariants. In the second part of the talk, I will describe microscopic formulas for transport coefficients (Kubo formulas) which are valid for arbitrary interacting lattice systems. I will show that in general “textbook” Kubo formulas require corrections. This is true even for some dissipative transport coefficients, such as Seebeck and Peltier coefficients. I will also make a few remarks about “matching” (in the sense of Effective Field Theory) between microscopic descriptions of transport and hydrodynamics.