169 citations · 991 across the 32 of their papers we have counts for
33 papers
Reading Altermagnetic Domains with Photon Drag
Sayed Ali Akbar Ghorashi, Andrew M. Rappe
Finite photon momentum allows second-order photocurrents in centrosymmetric space groups, where the conventional bulk photovoltaic effect is forbidden. Here we study the photon-dra…
Defect-Controlled Multiferroicity via Stacking Control in Nonmagnetic van der Waals Bilayers
Bumseop Kim, Sayed Ali Akbar Ghorashi, Andrew M. Rappe
We present a general paradigm that directly couples vacancy-localized magnetism to interfacial sliding ferroelectricity in nonmagnetic van der Waals (vdWs) bilayers. Utilizing bila…
Multiphoton Fingerprints of Altermagnetic Spin Splittings
Sayed Ali Akbar Ghorashi, Andrew M. Rappe
We systematically investigate multiphoton absorption as a polarization-resolved nonlinear optical probe of planar altermagnets (ALMs). We show that the angular harmonic of the alte…
Bulk-dissociated topological bands without spin-orbit coupling in hetero-dimensional superconducting metamaterials
Joseph J. Cuozzo, Sayed Ali Akbar Ghorashi, Purna P. Paudel +3
Topological superconductors (TSCs) in superconducting hybrid heterostructures, which integrate superconducting and non-superconducting materials, have been intensely investigated w…
Field-unmasked quantum geometry in a symmetry-forbidden photocurrent
Bumseop Kim, Aaron M. Burger, Zhenbang Dai +6
Frequency- and polarization-resolved photocurrents provide a sensitive probe of hidden symmetry and band geometry in quantum materials. Here we study a chiral cubic sillenite whose…
Topological Reality Switch: Towards Bulk-Boundary Selective Lasing
Sayed Ali Akbar Ghorashi, Masatoshi Sato
The emergence of complex spectra in non-Hermitian systems causes dramatic changes even under weak perturbations, significantly hindering their precise control for study and integra…
Majoranas with a twist: Tunable Majorana zero modes in altermagnetic heterostructures
Andreas Hadjipaschalis, Sayed Ali Akbar Ghorashi, Jennifer Cano
Altermagnetism provides new routes to realize Majorana zero modes with vanishing net magnetization. We consider a recently proposed heterostructure consisting of a semiconducting w…
Quantum-geometric dipole: a topological boost to flavor ferromagnetism in flat bands
Lei Chen, Sayed Ali Akbar Ghorashi, Jennifer Cano +1
Robust flavor-polarized phases are a striking hallmark of many flat-band moiré materials. In this work, we trace the origin of this spontaneous polarization to a lesser-known quant…
Tunable Topological Phases in Multilayer Graphene Coupled to a Chiral Cavity
Sayed Ali Akbar Ghorashi, Jennifer Cano, Ceren B. Dag
Coupling photonic cavity fields to electronic degrees of freedom in 2D materials introduces an additional control knob to the toolbox of solid-state engineering. Here we demonstrat…
Optimizing superlattice bilayer graphene for a fractional Chern insulator
Dathan Ault-McCoy, M. Nabil Y. Lhachemi, Aaron Dunbrack +2
Bernal-stacked bilayer graphene modulated by a superlattice potential is a highly tunable system predicted to realize isolated topological flat bands. In this work we calculate the…
Dynamical Generation of Higher-order Spin-Orbit Couplings, Topology and Persistent Spin Texture in Light-Irradiated Altermagnets
Sayed Ali Akbar Ghorashi, Qiang Li
Altermagnets have been identified as the third category of magnetic materials, exhibiting momentum-dependent spin splitting characterized by even powers of momentum. In this study,…
Uncovering the Hidden Ferroaxial Density Wave as the Origin of the Axial Higgs Mode in RTe
Birender Singh, Grant McNamara, Kyung-Mo Kim +24
The recent discovery of an axial amplitude (Higgs) mode in the long-studied charge density wave (CDW) systems GdTe and LaTe suggests a heretofore unidentified hidden order.…
Hidden Kondo lattice physics in single-orbital Hubbard models
Philipp Werner, Sayed Ali Akbar Ghorashi
Single-orbital Hubbard models exhibit remarkably nontrivial correlation phenomena, even on nonfrustrated bipartite lattices. Some of these, like non-Fermi-liquid metal states, or t…
Charge density-waves with non-trivial orbital textures in rare earth tritellurides
Sergey Alekseev, Sayed Ali Akbar Ghorashi, Rafael M. Fernandes +1
Motivated by recent experiments reporting unconventional collective modes in the charge density-wave (CDW) state of rare-earth tritellurides Te, we derive from a multi-orbit…
Gate-tunable topological phases in superlattice modulated bilayer graphene
Yongxin Zeng, Tobias M. R. Wolf, Chunli Huang +4
Superlattice potential modulation can produce flat minibands in Bernal-stacked bilayer graphene. In this work we study how band topology and interaction-induced symmetry-broken pha…
Quantum geometry induced nonlinear transport in altermagnets
Yuan Fang, Jennifer Cano, Sayed Ali Akbar Ghorashi
Quantum geometry plays a pivotal role in the second-order response of -symmetric antiferromagnets. Here we study the nonlinear response of 2D altermagnets protected by $C_…
Altermagnetic Routes to Majorana Modes in Zero Net Magnetization
Sayed Ali Akbar Ghorashi, Taylor L. Hughes, Jennifer Cano
We propose heterostructures that realize first and second order topological superconductivity with vanishing net magnetization by utilizing altermagnetism. Such platforms may offer…
Multilayer graphene with a superlattice potential
Sayed Ali Akbar Ghorashi, Jennifer Cano
Bernal stacked bilayer graphene subject to a superlattice potential can realize topological and stacked flat bands [1]. In the present work, we extend the study of a superlattice p…
Higher-Order Nodal Hinge States in Doped Superconducting Topological Insulator
Sayed Ali Akbar Ghorashi, Jennifer Cano, Enrico Rossi +1
Doped strong topological insulators are one of the most promising candidates to realize a fully gapped three-dimensional topological superconductor (TSC). In this letter, we revisi…
Topological and stacked flat bands in bilayer graphene with a superlattice potential
Sayed Ali Akbar Ghorashi, Aaron Dunbrack, Ahmed Abouelkomsan +3
We show that bilayer graphene in the presence of a 2D superlattice potential provides a highly tunable setup that can realize a variety of flat band phenomena. We focus on two regi…
Non-Hermitian Higher-Order Weyl Semimetals
Sayed Ali Akbar Ghorashi, Tianhe Li, Masatoshi Sato
We study non-Hermitian higher-order Weyl semimetals (NHHOWSMs) possessing real spectra and having inversion (-NHHOWSM) or time-reversal symmetry $\mathca…
Non-Hermitian Higher-Order Dirac Semimetals
Sayed Ali Akbar Ghorashi, Tianhe Li, Masatoshi Sato +1
In this article we study 3D non-Hermitian higher-order Dirac semimetals (NHHODSMs). Our focus is on -symmetric non-Hermitian systems where we investigate inversion ($\mathcal{…
The Future of the Correlated Electron Problem
A. Alexandradinata, N. P. Armitage, Andrey Baydin +44
A central problem in modern condensed matter physics is the understanding of materials with strong electron correlations. Despite extensive work, the essential physics of many of t…
Higher-order Weyl Semimetals
Sayed Ali Akbar Ghorashi, Tianhe Li, Taylor L. Hughes
We investigate higher-order Weyl semimetals (HOWSMs) having bulk Weyl nodes attached to both surface and hinge Fermi arcs. We identify a new type of Weyl node, that we dub a …