2026 CAP Congress / Congrès de l'ACP 2026

Session

(DCMMP) T2-4 Hard Matter 5: Spin Orbit and Topological | Matière dure 5: Interaction spin-orbite et topologie (DPMCM)

T2-4

23 Jun 2026, 14:15

U. Ottawa - Learning Crossroads (CRX) Building

520. Electronic Raman scattering from 2D metals with broken inversion symmetry

Mojdeh Saleh (Concordia University)

23/06/2026, 14:15

Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM)

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle)

We study electronic Raman scattering (eRS) from low-energy excitations in many-electron metallic systems lacking inversion symmetry. In these systems, spin–orbit coupling lifts spin degeneracy at the Fermi level, enabling incoherent spin-flip excitations and coherent chiral-spin modes, which can be probed via Raman spectroscopy. These excitations have been experimentally observed using...

874. Novel magnetic and topological nickel monosilicides

Mr Dinura Hettiarachchi (University of Ottawa)

23/06/2026, 14:30

Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM)

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle)

Nickel monosilicides (NiSi) crystallize in various orthorhombic, hexagonal, and/or cubic structures, exhibiting rich polymorphism with unique physical properties. There have been surging fundamental and practical interests in their potential candidacy as emerging magnetic topological materials that are free of rare-earth elements. Here, by combining density functional theory and...

701. Spin currents in noncentrosymmetric crystals

Kirill Samokhin (Brock University)

23/06/2026, 14:45

Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM)

Oral (Non-Student) / Orale (non-étudiant(e))

We present a detailed analysis of the interband mixing effects on spin currents. Specifically, we calculate the intrinsic spin current in a nonmagnetic noncentrosymmetric crystal in the presence of electron-lattice spin-orbit coupling. We show that the standard definition of the spin current operator in terms of an effective band Hamiltonian cannot be justified using a microscopic theory....

897. The Kitaev-AKLT model: an exactly solvable model with exponential degeneracy

Ganesh Ramachandran

23/06/2026, 15:00

Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM)

Oral (Non-Student) / Orale (non-étudiant(e))

The AKLT model is a paradigmatic example of a gapped spin system that can be written in terms of fractionalized objects. We present an extension of this model with Kitaev-like anisotropy. At a special point, the Hamiltonian can be written as a sum of projectors, allowing for an AKLT-like construction. We have two choices on each bond, leading to an exponential ground state degeneracy. Ground...

661. A study of new types of states in generalized SSH systems

Kylian Lionnet

23/06/2026, 15:15

Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM)

Oral Competition (Undergraduate Student) / Compétition orale (Étudiant(e) du 1er cycle)

Recent advances in topological condensed matter physics have highlighted the importance of simple one-dimensional lattice models as building blocks for understanding more complex quantum systems. In particular, the Su–Schrieffer–Heeger (SSH) model has become a paradigmatic example of how topology controls the existence and robustness of eigenstates in low-dimensional systems. However, when the...

659. Strain-tuned topological bands in a three-dimensional Kagome antiferromagnet

Maxime Laniel (University of Ottawa)

23/06/2026, 15:30

Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM)

Oral Competition (Undergraduate Student) / Compétition orale (Étudiant(e) du 1er cycle)

Kagome materials have been the source of extensive recent studies for topological quantum matter with enhanced electronic correlation. Destructive interference of electronic hopping pathways in the geometrically frustrated Kagome lattice gives rise to signature topological bands near the Fermi level ($E_\mathrm{F}$), such as a doubly degenerate flat band, a Dirac cone, and van Hove...