Dr. Yogesh Singh
Indian Institute of Science Education and Research, Punjab, India.
Quantum Spin Liquids : Concept and Realization
Location: Zoom
Faculty Host: Nandini Trivedi
Abstract: The advent of Topological phases and orders has revolutionized the way in which electronic matter is classified, going beyond the symmetry breaking and order parameter paradigm of Landau. Quantum spin liquids (QSL) are phases which combine topological ideas with the strangeness of quantum mechanics, in the sense that they possess both topological properties and many body entanglement. In this talk I will introduce some of these ideas and how they apply to QSLs and I will contrast these properties with those of conventional magnetic states like a ferromagnet. I will discuss how as experimentalists we look for material realizations of QSLs. I will show experimental results on a couple of material families which are candidate QSL realizations. One of these is a Kagome bi-layer material Ca10Cr7O28, where an unusual combination of magnetic exchange interactions leads to magnetic frustration, and the other is the A2IrO3 (A = Li, Na) family where experiments show that a combination of strong spin-orbit coupling and electron correlations lead to exotic bond-dependent magnetic exchange, making them realizations of the Kitaev honeycomb model.
BIO:
2004 PhD TIFR Mumbai
2005-2009 : Postdoc at Ames Lab, USA
2009-2011 : Alexander von Humboldt Fellow at University of Goettingen
2011 -2017 : Assistant Prof. Department of Physical Sciences, IISER Mohali
May-July 2012 : Visiting Professor, University of Goettingen
2017-current : Associate Prof. Department of Physical Sciences, IISER Mohali
Nov. 2021 - June 2022 : Visiting Professor, ISSP, University of Tokyo, Japan.
2021-current : Head Department of Physical Sciences, IISER Mohali
Zoom:
https://osu.zoom.us/j/96224641621?pwd=TWZXN2xBaDRTVTRHM0kyMm56ajdVZz09
Meeting ID: 962 2464 1621
Password: 3.14159
Students and postdocs are invited to stay and chat with the speaker from 11:00 – 12:00
