Ballistic transport and crystallographic control in altermagnetic quantum rings
Abstract
We study coherent two-terminal transport through a finite-width d-wave altermagnetic quantum ring with nonmagnetic leads. A confined Aharonov--Bohm flux remains exactly h/e periodic and, in the symmetric one-mode geometry, produces an exact half-flux transmission zero. A perpendicular field shifts the interference pattern according to an effective area Aeff=1.0342 πr02 and the altermagnetic splitting resolves the common zero into nearby spin-dependent nodes. Rotating the crystal reverses the transmitted spin, whereas the mirror orientation θA=π/4 is exactly spin degenerate. For a $50$~nm reference ring, sub-tesla fields yield windows with |PT|>0.99, the most accessible of which requires a uniform field alone and no confined flux. Finite-bias, thermal, disorder, Zeeman, and spin-conserving voltage-probe calculations show that the polarization is appreciably more stable than individual coherent-resonance amplitudes. These results identify interference-node positions, flux periodicity, and crystal-controlled spin polarization as experimentally useful signatures of an altermagnetic mesoscopic interferometer.
Related
- Robust Spin Universality Across a Ballistic-to-Diffusive Transport Crossover
- Exact ballistic energy transport and emergent XXZ dynamics in an integrable three-state chain
- Valley- and Spin-Dependent Electronic and Transport Properties of Two-Dimensional Altermagnetic Titanium-Based Chalcogenide Halides
- Unconventional SOC-activated Altermagnetic Spin Splitting and Half-Angle Locking of Spin Transport
- Symmetry-guided Design Principles for Spin Splitting and Hall Transport in Orthorhombic Altermagnetic Perovskites
BibTeX
@misc{silva2026ballistic,
title = {{Ballistic transport and crystallographic control in altermagnetic quantum rings}},
author = {Edilberto O. Silva},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.27173},
eprint = {2610.27173},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.27173},
}
RIS
TY - UNPB
TI - Ballistic transport and crystallographic control in altermagnetic quantum rings
AU - Edilberto O. Silva
PY - 2026
DA - 2026/10/19
PB - arXiv
DO - 10.48550/arxiv.2610.27173
UR - https://arxiv.org/abs/2610.27173
AB - We study coherent two-terminal transport through a finite-width d-wave altermagnetic quantum ring with nonmagnetic leads. A confined Aharonov--Bohm flux remains exactly h/e periodic and, in the symmetric one-mode geometry, produces an exact half-flux transmission zero. A perpendicular field shifts the interference pattern according to an effective area A_eff=1.0342 πr_0^2 and the altermagnetic splitting resolves the common zero into nearby spin-dependent nodes. Rotating the crystal reverses the transmitted spin, whereas the mirror orientation θ_A=π/4 is exactly spin degenerate. For a $50$~nm reference ring, sub-tesla fields yield windows with |P_T|>0.99, the most accessible of which requires a uniform field alone and no confined flux. Finite-bias, thermal, disorder, Zeeman, and spin-conserving voltage-probe calculations show that the polarization is appreciably more stable than individual coherent-resonance amplitudes. These results identify interference-node positions, flux periodicity, and crystal-controlled spin polarization as experimentally useful signatures of an altermagnetic mesoscopic interferometer.
ER -