Dresden 2026 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 26: Transport in Materials: Diffusion, Charge, or Heat Conduction I
MM 26.4: Talk
Wednesday, March 11, 2026, 16:30–16:45, SCH/A216
Quantum interference in higher pseudospin fermions — •Gargee Sharma and Arpan Gupta — Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016 India
We construct a unified theory of quantum-interference corrections in disordered pseudospin-s fermions described by k·S Hamiltonians. Employing the rotation-group structure of SU(2), we derive closed-form wavefunctions, scattering and vertex corrections, and Cooperon kernels valid for arbitrary pseudospin s in two and three dimensions. A universal “parity rule” emerges: integer s (orthogonal symmetry, T2=+1) yields weak localization, half-integer s (symplectic, T2=−1) yields weak antilocalization, while interband and intervalley scattering renormalize the prefactor via a finite Cooperon-mass matrix. Explicit results for s=12 and s=1 reproduce graphene and spin-1 Weyl limits and verify the general scaling laws. Our approach resolves the long-standing ambiguity in interband scattering, providing an analytic route for arbitrary s and concrete predictions for multifold-fermion materials.
Keywords: weyl semimetals; quantum interference; weak localization; cooperon; pseudospin