A5026776490- Topological Materials and Phenomena
- 2D Materials and Applications
- Graphene research and applications
- Perovskite Materials and Applications
- Quantum and electron transport phenomena
- Plasmonic and Surface Plasmon Research
- Quantum Dots Synthesis And Properties
- Cold Atom Physics and Bose-Einstein Condensates
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Quantum optics and atomic interactions
- Chalcogenide Semiconductor Thin Films
- Essential Oils and Antimicrobial Activity
- Electronic and Structural Properties of Oxides
- Atomic and Subatomic Physics Research
- Advanced Thermoelectric Materials and Devices
- Conducting polymers and applications
- TiO2 Photocatalysis and Solar Cells
- Magnetic Field Sensors Techniques
- Phytochemistry and Biological Activities
- Transition Metal Oxide Nanomaterials
- Magnetic properties of thin films
- Quantum many-body systems
- Advanced Memory and Neural Computing
- Photorefractive and Nonlinear Optics
The University of Texas at Austin
2022-2025
Massachusetts Institute of Technology
2022-2025
Northeastern University
2022-2024
Universidad del Noreste
2024
Central University of Haryana
2023
California Institute of Technology
2018-2022
Banasthali University
2011-2020
Indian Institute of Technology Kanpur
2018
Post Graduate Institute of Medical Education and Research
2018
National Institute of Plant Genome Research
2009-2013
Moir\'e materials, and in particular twisted bilayer graphene (TBG), exhibit a range of fascinating phenomena that emerge from the interplay band topology interactions. We show nonlinear second-order photoresponse is an appealing probe this rich interplay. A dominant part shift current, which determined by geometry electronic wave functions carrier properties thus becomes strongly modified electron-electron analyze its dependence on twist angle doping investigate role In absence...
The recently demonstrated chiral modes of lattice motion carry angular momentum and therefore directly couple to magnetic fields. Notably, their moments are predicted be strongly influenced by electronic contributions. Here, we have studied the response transverse optical phonons in a set Pb 1− x Sn Te films, which is topological crystalline insulator for > 0.32 has ferroelectric transition at an -dependent critical temperature. Polarization-dependent terahertz magnetospectroscopy...
The interplay of charge, spin, lattice, and orbital degrees freedom in correlated materials often leads to rich exotic properties. Recent studies have brought new perspectives bosonic collective excitations materials. For example, inelastic neutron scattering experiments revealed non-trivial band topology for magnons spin–orbit excitons (SOEs) a quantum magnet CoTiO 3 (CTO). Here, we report phonon properties resulting from combination strong coupling, large crystal field splitting, trigonal...
The co-existence of spatial and non-spatial symmetries together with appropriate commutation/anticommutation relations between them can give rise to static higher-order topological phases, which host gapless boundary modes co-dimension higher than one. Alternatively, space-time in a Floquet system also lead anomalous co-dimensions, presumably alterations the respect symmetries. We show how coherently excited phonon mode be used promote symmetry is always trivial, supports non-trivial phase....
We investigate the dependence of photogalvanic response a twofold degenerate multi-Weyl semimetal on its topological charge, tilt, and chemical potential. derive analytical expressions for shift injection conductivities tilted charge-<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi>n</a:mi></a:math> Weyl points using low-energy two-band effective Hamiltonian. compute more realistic tight-binding models double-Weyl with broken time-reversal symmetry to find significant deviations...
We present a scheme to control the spin-exchange interactions by manipulating orbital degrees of freedom using periodic drive. discuss two different protocols for Floquet engineering. In one case, drive modifies properties ligand orbitals which mediate magnetic between transition-metal ions. other we consider drive-induced mixing $d$ on each ion. first find that an AC Stark shift induces change comparable induced from photoinduced hopping schemes, but expands applicable frequency ranges....
We theoretically study first- and second-order optical responses in a transition-metal dichalcogenide monolayer with distinct trivial, nodal, time-reversal invariant topological superconducting (TRITOPS) phases. show that the dc response, also known as photogalvanic contains signatures for differentiating these phases while first-order response does not. find high-frequency is insensitive to phase of system, low-frequency exhibits features distinguishing three At zero doping, corresponding...
Materials exhibiting a significant shift current response could potentially outperform conventional solar cell materials. The myriad of factors governing shift-current response, however, poses challenges in finding such strong Here we propose general design principle that exploits inter-orbital mixing to excite virtual multiband transitions materials with multiple flat bands achieve an enhanced response. We further relate this maximizing Wannier function spread as expressed through the...
We propose a single phase-only optical element that transforms different orbital angular momentum (OAM) modes into localized spots at separated positions on transverse plane.We refer to this as lens since it separates out OAM in manner analogous how converging wave-vector the focal also simulate proposed using spatial light modulator and experimentally demonstrate its working.Our work can have important implications for OAM-based classical quantum communication applications.
Directly modifying spin exchange energies in a magnetic material with light can enable ultrafast control of its states. Current approaches rely on tuning charge hopping amplitudes that mediate by optically exciting either virtual or real charge-transfer transitions (CT) between sites. Here we show when is mediated non-magnetic ligand, it be substantially enhanced CT transition from the ligand to site, introducing lower order contributions. We demonstrate sub-picosecond enhancement...
The breaking of time-reversal symmetry is a crucial ingredient to topological bands. It can occur intrisically in materials with magnetic order, or be induced by external fields, such as fields quantum Hall systems, circularly polarized light Floquet Chern insulators. Apart from polarization, photons carry another degree freedom, orbital angular momentum, through which broken. In this Letter, we pose the question whether property allows for inducing bands via linearly but twisted beam. To...
Excitons are neutral objects, that, naively, should have no response to a uniform, electric field. Could the Berry curvature of underlying electronic bands alter this conclusion? In work, we show that can indeed lead anomalous transport for excitons in 2D materials subject in-plane By considering constituent electron and hole dynamics, demonstrate there exists regime which corresponding velocities same direction. We establish resulting center mass motion exciton through both semiclassical...
Purpose: The aim of this study was to examine the knowledge about injury prevention during all India university Netball women's tournament. Materials and Methods: For study, 14 female netball players from different universities representing age ranges (18 24) were selected health center at Central University Haryana Mahendergarh. subject referred centre because some internal external injuries that's why we those who admitted centre. In observation method used variables leg pain, finger ankle...
Multilayered graphene systems provide a highly tunable platform to study quantum geometric effects. Here, the authors show that geometry of electronic bands in rhombohedral trilayer leads large shift-current response which can be tuned by applying displacement field perpendicular layers. The compare with Bernal stacked bilayer and find additional features arising due confluence multiband nature graphene.
Motivated by the recent excitement around physics of twisted transition metal dichalcogenide (TMD) multilayer systems, we study strongly correlated phases TMD heterobilayers under influence light. We consider both waveguide light and circularly polarized The former allows for longitudinally light, which in high frequency limit can be used to selectively modify interlayer hoppings a tight-binding model. argue based on quasi-degenerate perturbation theory that changes captured as modulation...
Circularly polarized lattice vibrations carry angular momentum and lead to magnetic responses in applied fields or when resonantly driven with ultrashort laser pulses. Recent measurements have found that are orders of magnitude larger than those calculated prior theoretical studies. Here, we present a microscopic model for the effective moments chiral phonons materials is able reproduce experimentally measured magnitudes allows us make quantitative predictions giant using parameters. Our...