Local signatures of altermagnetism

Abstract

Altermagnets constitute a class of collinear compensated Néel ordered magnets that break time-reversal symmetry and feature spin-split band structures. Based on versatile microscopic models able to capture the altermagnetic sublattice degrees of freedom, we study characteristic local signatures of altermagnetism near disorder sites. We give a complete list of two-dimensional models that exhibit altermagnetism classified by their corresponding layer groups. Specifically, we calculate the local density of states in the vicinity of pointlike nonmagnetic impurities and expose its spatial dependence for two minimal models showcasing $d$-wave and $g$-wave altermagnetism. The momentum structure of the nodes ($d$-wave, $g$-wave, etc.) is directly imprinted on the total local density of states, thus measurable by scanning tunneling conductance experiments. This signature is present both in the spin-resolved as well as the spin-summed local density of states. We find a weaker response in the nonmagnetic state from the anisotropic crystal environment and uncover the importance of the sublattice degree of freedom to model altermagnets. We also study coexistence phases of altermagnetism and superconductivity and provide predictions for the local impurity response of in-gap bound states. The response of impurity bound states strongly enhances the distinct altermagnetic signature.

References in corpus (33)

• Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
• Imaging the Effects of Individual Zinc Impurity Atoms on Superconductivity in Bi2Sr2CaCu2O8+delta
• Multifunctional Antiferromagnetic Materials with Giant Piezomagnetism and Noncollinear Spin Current
• Broken Kramers' degeneracy in altermagnetic MnTe
• Direct observation of altermagnetic band splitting in CrSb thin films
• Interplay of magnetism and high-Tc superconductivity at individual Ni impurity atoms in Bi2Sr2CaCu2O8+d
• Observation of Giant Band Splitting in Altermagnetic MnTe
• Large band-splitting in $g$-wave type altermagnet CrSb
• Bogoliubov Fermi surfaces in superconductors with broken time-reversal symmetry
• Two-dimensional altermagnets: Superconductivity in a minimal microscopic model
• Minimal Models for Altermagnetism
• Two-dimensional altermagnets from high throughput computational screening: symmetry requirements, chiral magnons and spin-orbit effects
• Disorder-Induced Static Antiferromagnetism in Cuprate Superconductors
• Interpretation of scanning tunneling quasiparticle interference and impurity states in cuprates
• Competing magnetic double-Q phases and superconductivity-induced re-entrance of C2 magnetic stripe order in iron pnictides
• States of Local Moment Induced by Nonmagnetic Impurities in Cuprate Superconductors
• Antiferromagnetic correlations and impurity broadening of NMR linewidths in cuprate superconductors
• Unconventional p-wave and finite-momentum superconductivity induced by altermagnetism through the formation of Bogoliubov Fermi surface
• Unconventional disorder effects in correlated superconductors
• Disorder- and Field-Induced Antiferromagnetism in Cuprate Superconductors
• Bogoliubov Fermi Surfaces in Spin-1/2 Systems: Model Hamiltonians and Experimental Consequences
• Breakdown of universal transport in correlated d-wave superconductors
• Impurity-induced Friedel oscillations in altermagnets and $p$-wave magnets
• Universality of scanning tunneling microscopy in cuprate superconductors
• Impact of Iron-site defects on Superconductivity in LiFeAs
• Theoretical study of impurity-induced magnetism in FeSe
• Impurity-induced antiferromagnetic order in Pauli-limited nodal superconductors: application to heavy fermion CeCoIn5
• Altermagnetic Instabilities from Quantum Geometry
• Scanning tunneling spectroscopy as a probe of multi-Q magnetic states of itinerant magnets
• Field-sensitive dislocation bound states in two-dimensional $d$-wave altermagnets
• Interplay of Hidden Orbital Order and Superconductivity in CeCoIn5
• Quasiparticle interference in altermagnets
• Antichiral surface states and Su-Schrieffer-Heeger physics in rutile altermagnets

Cited by in corpus (9)

• Superconducting phenomena in systems with unconventional magnets
• Tuning of altermagnetism by strain
• Impurity states in altermagnetic superconductors
• Unlocking Doping Effects on Altermagnetism in MnTe: Emergence of Quasi-altermagnetism
• Inherent momentum-dependent gap structure of altermagnetic superconductors
• Spin-resolved quasiparticle interference patterns on altermagnets via non-spin-resolved scanning tunneling microscopy
• Marginal Metals and Kosterlitz-Thouless Type Phase Transition in Disordered Altermagnets
• Interaction enhanced altermagnet in the Hatsugai-Kohmoto model
• Spin triplet pairing by suppressing altermagnetism