Spin-biased quantum spin Hall effect in altermagnetic Lieb lattice

Abstract

Altermagnetic (AM) order, a recently discovered magnetic state, has attracted intense research interest for its potential applications in spintronic and quantum technologies. Here, we theoretically investigate the AM state in the Lieb lattice, a prototypical two-dimensional lattice, using the Hubbard model. We show that AM order emerges with only moderate electronic correlations. Strikingly, spin-orbit coupling drives the system into a topological phase exhibiting a new quantum spin Hall effect (QSHE) with spin-biased topological edge states in one-dimensional nanoribbons. These edge states possess different localizations and velocities, and hence may produce spin and charge currents, fundamentally distinct from that in conventional topological insulators with spin degeneracy. This novel spin-biased QSHE in the AM Lieb lattice unveils exciting opportunities for both fundamental studies and innovative device concepts, motivating immediate experimental exploration.

References in corpus (28)

• Quantum Spin Hall Effect in Graphene
• $Z_2$ Topological Order and the Quantum Spin Hall Effect
• Berry Phase Effects on Electronic Properties
• Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
• Broken Kramers' degeneracy in altermagnetic MnTe
• Altermagnetism: Exploring New Frontiers in Magnetism and Spintronics
• Direct observation of altermagnetic band splitting in CrSb thin films
• Robustness of the Spin-Chern number
• Time-reversal-symmetry-broken quantum spin Hall effect
• Large band-splitting in $g$-wave type altermagnet CrSb
• Discovery of a metallic room-temperature d-wave altermagnet KV2Se2O
• Twisted Magnetic Van der Waals Bilayers: An Ideal Platform for Altermagnetism
• Absence of altermagnetic spin splitting character in rutile oxide RuO${}_2$
• Two-dimensional altermagnets: Superconductivity in a minimal microscopic model
• Crystal-symmetry-paired spin-valley locking in a layered room-temperature antiferromagnet
• Altermagnetism with Non-collinear Spins
• Mirror Chern Bands and Weyl Nodal Loops in Altermagnets
• sd2 Graphene: Kagome Band in Hexagonal lattice
• Description of two-dimensional altermagnetism: Categorization using spin group theory
• Altermagnetic anomalous Hall effect emerging from electronic correlations
• Realizing Altermagnetism in Fermi-Hubbard Models with Ultracold Atoms
• Observation of the anomalous Nernst effect in altermagnetic candidate Mn5Si3
• Experimental Realization of Two-Dimensional Buckled Lieb lattice
• Spin Chern number in altermagnets
• Chemical design of monolayer altermagnets
• Hidden altermagnetism
• Engineering Altermagnetism via Layer Shifts and Spin Order in Bilayer MnPS${}_3$
• Realizing robust large-gap quantum spin Hall state in 2D HgTe monolayer on insulating substrate