"Magnetism, superconductivity and non-trivial topology in quantum materials"by Ni Ni (UCLA)

Thursday, October 11, 2018 - 3:30pm to 4:30pm
Physics and Astronomy Colloquium

Thursdays, 3:30-4:30 pm

1-434 Physics and Astronomy (map)
Reception from 3:30-4:30 p.m.
(unless otherwise posted)


Guest Speaker: Ni Ni (University of California, Los Angeles)


Talk Title:  “Magnetism, superconductivity and non-trivial topology in quantum materials”



New materials are the driving force for technology innovations and our progressive understanding in condensed mater physics. In the last decade, breakthrough has been made on two material systems: high-temperature superconductors and three-dimensional topological materials. For the former, Fe based superconductors were discovered, joining cuprates and becoming the 2nd member in the high temperature superconductor club. For the latter, the discovery of bulk materials with non-trivial topology has led to rich new emergent phenomena, including Fermi arc surface state, chiral pumping effect, colossal photovoltaic effect, etc.

In this talk, I will present the exciting progress along both directions. I will first go through how the chemical doping and external pressure tune the competing structural, magnetic and superconducting orders in the newly discovered 112 Fe pnictide superconductors. Then I will show the discovery of a “hydrogen atom” topological nodal line semimetal where two nontrivial bulk bands touch along a line and no trivial bands exist at the Fermi level.

For more information, contact Yaroslav Tserkovnyak

We thank the following people for their contributions to the wine fund for the post-colloquium reception:
Professors Katsushi Arisaka, Andrea Ghez, Karoly Holczer, Huan Huang, HongWen Jiang, Per Kraus, Alexander Kusenko, Matthew Malkan, Mayank Mehta, Warren Mori, Ni Ni, Seth Putterman, Yaroslav Tserkovnyak, Vladimir Vassiliev, Shenshen Wang, and Nathan Whitehorn.

1-434 PAB