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Faculty of Science

Department of Physics & Astronomy

Dr. Solomon Owerre - Perimeter Institute

Description


Title: Developmentand Validation of New Techniques for Nuclear Medicine

Speaker: Dr. Solomon Owerre

Institute: Peremeter Instiute

Location: ABB-319

Description: Weyl nodes have been experimentally realized in photonic, 

electronic, and phononic crystals. However, magnonic Weyl nodes are yet to be seen experimentally.  In this talk, I will show a recent proposal of  realistic Weyl magnon nodes in noncoplanar stacked frustrated kagome antiferromagnets, which are naturally available in various real materials.  The Weyl magnon nodes in this system occur at the lowest excitation, which is synonymous with electronic Weyl nodes near the Fermi energy,  and they possess a topological  thermal Hall effect, and can be experimentally observed at low temperatures due to the population effect of bosonic quasiparticles.In stark contrast to other magnetic  Weyl systems, the current Weyl nodes do not rely on time-reversal symmetry breaking by the magnetic order. Rather, they result from explicit macroscopically broken time reversal symmetry by the scalar spin chirality of noncoplanar spin textures, and can be generalized to chiral spin liquid states. Moreover, the scalar spin chirality gives a real space Berry curvature which is not available in previously studied magnetic Weyl systems.   They also possess a Fermi (magnon) arc surface states connecting projected Weyl magnon nodes on the surface Brillouin zone.


Location information

1280 Main St W, Hamilton, ON L8S 4L8, Canada

Country
Canada
County
Ontario
City
Hamilton L8S 4L8
Street
1280 Main Street West

McMaster University - Faculty of Science

Mailing Address

Department of Physics & Astronomy,
McMaster University

ABB-241
1280 Main Street West
Hamilton, Ontario, Canada
L8S 4M1

Contact Information

Telephone Inquiries:
+1 (905) 525-9140 ext.24559
Fax:
(905) 546-1252
Email Inquiries:
physics@mcmaster.ca

McMaster University - Faculty of Science

Mailing Address

Department of Physics & Astronomy,
McMaster University

ABB-241
1280 Main Street West
Hamilton, Ontario, Canada
L8S 4M1

Contact Information

Telephone Inquiries:
+1 (905) 525-9140 ext.24558
Fax:
(905) 546-1252
Email Inquiries:
physics@mcmaster.ca