Physics 838 Graduate Student Seminar

In 1990, a seminar was initiated for QMC (formerly CNAM/CSR) graduate students in order to present their research to the other students, postdocs, and faculty in the Center. In addition to fostering a rich, collaborative environment in which students learn about the breadth and scope of research being done in QMC, the idea of this series is to teach several crucial skills to our students:

1) How to present their research in a clear and time-efficient way to an audience that was not expert in their area of research;

2) How to best answer questions during their presentations;

3) How to ask good questions when in an audience (or interview), in particular about research beyond their own narrow PhD topic.

In this seminar, students submit formalized feedback to each weekly presenter, providing informative information about presentation style, research content and tips for improvement.

Best Speaker Awards

At the end of each term, a cash prize award is given for the best student and postdoc presentations based on class feedback scores. Previous winners are listed here:

2018 (fall) Chris Eckberg (student), Jen-Hao Yeh (postdoc)

2015 Paul Syers, Jasper Drisko

2014 Sean Fackler, Paul Syers,

2013 Kevin Kirshenbaum, Kirsten Burson

2012 Baladitya Suri, Kristen Burson

2011 (fall) Sergii Pershoguba, Ted Thorbeck

2011 (spring) Anirban Gangopadhyay, Baladitya Suri

2010 (fall) Christian J. Long, Tomasz M. Kott

2010 (spring) Tomasz M. Kott, Kevin Kirshenbaum

2009 (fall) Arun Luykx, Jen-Hao Yeh


Physics 838 Seminar
02.17.2020 4:00 pm - 5:00 pm
John S. Toll Rm 1201


Speaker: Pampa R Mandal

Title: Giant thermal Hall conductivity in the pseudogap phase of cuprate superconductors
The origin of the pseudogap phenomena in the high temperature superconductors remains
unsolved. There are speculations that this could be a magnetic phase transition but evidence for
an associated magnetic order is still lacking. Thermal Hall effect has been emerged as a powerful
tool to probe the presence of unconventional excitations in the correlated electron systems.
Thermal Hall effect describes heat flow in a direction transverse to a temperature gradient in the
presence of a magnetic field. In this talk, I will discuss about recent report of a large negative κ xy
(thermal hall conductivity) observed in hole-doped and undoped (p ≈ 0) cuprates, which has been
linked to the pseudogap phase [1]. The conventional mobile charge carriers, magnons, and
phonons contributions have been excluded as the origin of this giant κ xy signal. It is argued that
neutral excitations with spin chirality in the pseudogap phase of cuprates is responsible for this
giant thermal hall effect. It will be interesting to study the thermal hall effect in electron doped
cuprates because there is no pseudogap phase.
[1] G. Grissonnanche et al. Nature 571, 376 (2019)

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