45 citations · 142 across the 31 of their papers we have counts for
32 papers
Altermagnetism from the viewpoint of chemistry
Nayana Devaraj, Anumita Bose, Md Afsar Reja +2
Magnetism has been a central theme of research in chemistry, physics, and materials science, with chemical composition and bonding playing key roles in determining magnetic behavio…
Hidden chiral signatures in ferroaxial K2Zr(PO4)2
Nora Taufertshöfer, Awadhesh Narayan, Nicola A. Spaldin
We use first-principles calculations and multipole analyses to demonstrate the relationship between ferroaxiality and chirality in the prototypical ferroaxial material K2Zr(PO4)2.…
Transport Evidence of Magnetic Polarization in the Altermagnetic Candidate MnTe
Younes Ghorbani, Nayana Devaraj, Joshua Maile +7
The ability to precisely control magnetic properties is central to the development of future spin-based electronics. In this work, we report the successful growth of epitaxial α-Mn…
Electric field induced Berry curvature dipole in quasi-one-dimensional BiI
Amiya Mondal, Awadhesh Narayan
The nonlinear Hall effect in time-reversal symmetric materials offers a powerful probe into quantum geometry. Here, we investigate the electric-field-tunable nonlinear Hall respons…
Light-tunable quantum metric non-linear Hall response in Berry dipole semimetals
Debashree Chowdhury, Awadhesh Narayan
We investigate the effect of light on quantum metric-mediated intrinsic nonlinear Hall conductivity in Berry dipole semimetals. We discover that light induces a tunable asymmetry i…
The Bott Metric: A Real-Space Bridge Between Topology and Quantum Metric
Kaustav Chatterjee, Ronika Sarkar, Md Afsar Reja +1
The Bott index has become an indispensable tool to probe the topology of quantum matter, particularly in systems lacking translational symmetry. Constructed from a plaquette operat…
Quantum metric senses a persistent spin helix
Awadhesh Narayan
Persistent spin helices are a manifestation of symmetry-protected spin textures in systems with balanced spin-orbit coupling. They enable long-lived spin structures that are of int…
Nonlinear Hall Effect in Metal-Organic Frameworks
Sarbajit Mazumdar, Jagadish N S, Awadhesh Narayan +3
We propose metal-organic frameworks (MOFs) as tunable platforms for nonlinear Hall responses. A universal analytical downfolding scheme maps -symmetric frameworks onto star- a…
Hexagonal Warping Control of Exceptional Points in Topological Insulator--Ferromagnetic Heterojunctions
Md Afsar Reja, Awadhesh Narayan
Exceptional points (EPs) are non-Hermitian degeneracies, where both eigenvalues and eigenvectors coalesce, which are fundamentally distinct from their Hermitian counterparts. In th…
Field-Tunable Quantum Metric in Few-Layer Phosphorene
Md Afsar Reja, Arka Bandyopadhyay, Awadhesh Narayan
The quantum metric -- which quantifies the distance between quantum states -- is a fundamental component of the quantum geometric tensor, playing a crucial role in a wide range of…
Refraction-induced transverse charge transport
Ronika Sarkar, Arka Bandyopadhyay, Awadhesh Narayan +1
We introduce a mechanism that produces a Hall-like transverse response in time-reversal-invariant materials, driven entirely by geometric effects. Specifically, we demonstrate that…
Berry Curvature Dipole-induced Non-linear Hall Effect in Oxide Heterostructures
Nesta Benno Joseph, Arka Bandyopadhyay, Ajit C. Balram +1
The observation of non-linear Hall effects in time-reversal invariant systems has established the intriguing role of band topology beyond Berry curvature in determining transport p…
Characterizing Liouvillian Exceptional Points Through Newton Polygons and Tropical Geometry
Sayooj P, Awadhesh Narayan
The dynamics of open quantum systems described by the Lindblad master equation follows according to non-Hermitian operators. As a result, such systems can host non-Hermitian degene…
Tunable topology, Hall response, and spin-textures in bicircularly polarized light illuminated altermagnets
Maitri Ganguli, Aneek Jana, Awadhesh Narayan
Altermagnets, featuring non-relativistic spin splitting, have drawn enormous attention due to their intriguing properties. Here, we investigate the effects of shining bicircularly…
Extremely Large and Angle-Dependent Magnetoresistance in Kagome Dirac Semimetal RFeSn (R=Ho, Dy)
Susanta Ghosh, Achintya Low, Nayana Devaraj +3
We report on the electronic, magnetic, and magneto-transport properties of Fe-based kagome Dirac system, RFeSn (R = Ho, Dy). Magnetic properties study reveals an antiferrom…
Unlocking Doping Effects on Altermagnetism in MnTe: Emergence of Quasi-altermagnetism
Nayana Devaraj, Anumita Bose, Arindom Das +4
Governed by specific symmetries, altermagnetism is an emerging field in condensed matter physics, characterized by unique spin-splitting of the bands in the momentum space co-exist…
Néel vector controlled exceptional contours in -wave magnet-ferromagnet junctions
Md Afsar Reja, Awadhesh Narayan
Non-Hermitian systems can host exceptional degeneracies where not only the eigenvalues, but also the corresponding eigenvectors coalesce. Recently, -wave magnets have been intro…
Modulation of Polarization and Metallicity in Janus Sliding Ferroelectrics
Akshay Mahajan, Awadhesh Narayan
Sliding ferroelectricity is emerging as a distinct and promising mechanism for realizing ferroelectricity in low-dimensional systems, offering new design principles beyond the conv…
Chiral damping with persistent edge states: interplay of spectral topology and band topology in open quantum systems
Ronika Sarkar, Suraj S. Hegde, Awadhesh Narayan +1
We study the dynamical consequences of combining the non-Hermitian skin effect with topological edge states. Focusing on the paradigmatic dissipative Hofstadter model, we find that…
Anomalous and parallel Hall effects in ferromagnetic Weyl semimetal CrTe
Anumita Bose, Shubham Purwar, Setti Thirupathaiah +1
Recently, time-reversal symmetry broken magnetic Weyl semimetals (WSMs) have attracted extensive attention and have provided an intriguing platform for exploring fundamental physic…
Floquet engineering of topological semimetals with bicircularly polarized light
Maitri Ganguli, Aneek Jana, Awadhesh Narayan
We study the effect of illumination of bicircularly polarized light (BCL) on topological semimetals, namely multifold fermion and line-node semimetals. We demonstrate, by means of…
Dopant-induced modulation of ferroelectricity in perovskite nitride LaWN
Harshvardhan Singh Deora, Awadhesh Narayan
Perovskite nitrides are starting to be explored for their promising properties distinct from their oxide counterparts. Here, through first-principles density functional computation…
Emergence of tunable exceptional points in altermagnet-ferromagnet junctions
Md Afsar Reja, Awadhesh Narayan
The existence of exceptional points (EPs) where both eigenvalues and eigenvectors converge is a key characteristic of non-Hermitian physics. A newly-discovered class of…
Chirality-tunable non-linear Hall effect
Nesta Benno Joseph, Arka Bandyopadhyay, Awadhesh Narayan
The non-linear generalization of the Hall effect has recently gained much attention, with a rapidly growing list of non-centrosymmetric materials that display higher-order Hall res…