2026 CAP Congress / Congrès de l'ACP 2026

Majorana Fermions in semiconductor-superconducting quantum dots with Rashba SOC and magnetic field

24 Jun 2026, 10:15

15m

U. Ottawa - Learning Crossroads (CRX) Building

Oral (Non-Student) / Orale (non-étudiant(e)) Advancing Quantum Simulation based on 2 Dimensional Materials Through Canadian Collaboration / Faire progresser la simulation quantique basée sur les matériaux bidimensionnels grâce à une collaboration canadienne W1-3 SYMPOSIUM: Advancing Quantum Simulation based on 2 Dimensional Materials Through Canadian Collaboration | Faire progresser la simulation quantique basée sur les matériaux bidimensionnels grâce à une collaboration canadienne

Speaker

Mijanur Islam (Post Doctorate fellow, University of Ottawa)

Description

Semiconductor–superconductor nanowires are intrinsically spinful and cannot, in general, be reduced to a single spinless Kitaev chain. We show that such systems are naturally described as two coupled $p$-wave (Kitaev-like) chains associated with different spin sectors. Using bond Fermion formulation and exact diagonalization, we analyze parity resolved spectra and local spectral functions, demonstrating that a zero-energy mode emerges only in one effective chain and is strongly localized at the system boundaries, while the bulk remains gapped. Inter-chain coupling lifts parity degeneracy and redistributes low-energy spectral weight, providing a controlled framework to assess the stability of Majorana like modes in finite spinful nanowires.