We will host monthly early-career seminars to provide a friendly, supportive platform for young researchers to showcase and communicate their research in English and to expand their professional networks by connecting with researchers in Japan and abroad.
We are pleased to announce the second seminar.
Speaker：Dr. Chris Lygouras
Affiliation：Princeton Materials Institute (PMI), Princeton University
Title：Topological fermions and collective behavior probed by neutron scattering
Date and Time： February 13, 2026 11:00 - noon Hybrid
*The social tea time will start from 10:30 am for in-person participants
Place：Room 512 of the Faculty of Science Building No. 1
Zoom：https://us02web.zoom.us/j/84694412845?pwd=UaaUKV6O6RzSJsXifb1PTXs73cqygf.1
Meeting ID: 846 9441 2845
Passcode: 775239
Abstract:
Drawing on the unique connection between electronic and spin degrees of freedom in the solid state is critical for revolutionizing spin electronics. Two notable classes of materials have come to the fore in this pursuit: altermagnets, whose electronic bands are spin-split due to the symmetry of the magnetic structure, even when the net magnetization is zero; and magnetic Weyl semimetals, whose magnetic order can generate and influence electronic band degeneracies. In this seminar, I discuss the profound influence of magnetism on electronic properties in these systems as uncovered by neutron scattering. First, I explore the stability of antiferromagnetic order in a Weyl altermagnet and investigate the subtle role of crystal stacking on spin-spin interactions. Second, I quantify the exchange interactions of a Weyl semimetal whose magnetic wavevector connects Weyl nodes in momentum space. We find signatures of itinerant Weyl electrons coupling to local moments, and reveal low-symmetry interactions that promote spin canting. These investigations highlight the use of neutron scattering as a probe of quantum magnets with exceptional electronic anomalies, and the importance of material development in the pursuit of next generation electronics.