A5065704951- Topological Materials and Phenomena
- 2D Materials and Applications
- Graphene research and applications
- Quantum and electron transport phenomena
- Advanced Thermoelectric Materials and Devices
- Physics of Superconductivity and Magnetism
- Advanced Photocatalysis Techniques
- Iron-based superconductors research
- Rare-earth and actinide compounds
- Chalcogenide Semiconductor Thin Films
- Ammonia Synthesis and Nitrogen Reduction
- Magnetic Field Sensors Techniques
- Boron and Carbon Nanomaterials Research
- Multiferroics and related materials
- Atomic and Subatomic Physics Research
- Perovskite Materials and Applications
- Caching and Content Delivery
- GaN-based semiconductor devices and materials
- MXene and MAX Phase Materials
Indian Institute of Science Bangalore
2021-2024
Indian Institute of Science Education and Research, Bhopal
2023
Photodetector based on two-dimensional (2D) materials is an ongoing quest in optoelectronics. These 2D photodetectors are generally efficient at low illuminating power but suffer severe recombination processes high power, which results the sublinear dependence of photoresponse and lower optoelectronic efficiency. The desirable superlinear photocurrent mostly achieved by sophisticated heterostructures or device arrays, while rarely show intrinsic photoresponse. Here, we report giant...
This review presents recent breakthroughs in the realm of nonlinear Hall effects, emphasizing central theoretical foundations and experimental progress. We elucidate quantum origin second-order response, focusing on Berry curvature dipole, which may arise inversion symmetry broken systems. The framework also reveals impact disorder scattering effects response. further discuss possibility obtaining responses beyond second order. examine symmetry-based indicators essential for manifestation...
Abstract The anomalous Hall effect in time-reversal symmetry broken systems is underpinned by the concept of Berry curvature band theory. However, recent experiments reveal that nonlinear (NHE) can be observed non-magnetic without applying an external magnetic field. emergence NHE under symmetric conditions explained terms non-vanishing dipole (BCD) arising from inversion breaking. In this work, we availed realistic tight-binding models, first-principles calculations, and analyses to explore...
The Mott-Ioffe-Regel limit sets the lower bound of carrier mean free path for coherent quasiparticle transport. Metallicity beyond this is great interest because it often closely related to quantum criticality and unconventional superconductivity. Progress along direction mainly focuses on strange-metal behaviors originating from evolution scattering rate, such as linear-in-temperature resistivity, while coherence phenomena in regime are much less explored due short at diffusive bound. Here...
Recently, there has been significant interest in topological nodal-line semimetals due to their linear energy dispersion with one-dimensional nodal lines or loops. These materials exhibit fascinating physical properties, such as drumhead surface states and 3D anisotropic structures. Similar Weyl semimetals, type-II have two crossing bands that are both electron-like hole-like along a certain direction. However, the direct observation of Fermions challenging lack suitable material platforms...
Recently discovered 2M phase of bulk WS$_2$ was observed to exhibit superconductivity with a critical temperature 8.8 K, the highest reported among superconducting transition metal dichalcogenides. Also predicted support protected surface states, it could be potential topological superconductor. In present study, we perform detailed first-principles analysis and bilayer WS$_2$. We report comprehensive investigation phase, comparing structural electronic properties obtained from different...
Electrosynthesis of ammonia (NH3), an important constituent molecule various commercial fertilizers, is a promising and sustainable alternative strategy compared with the century-old Haber-Bosch process. Herein, zinc telluride (ZnTe) demonstrated as efficient electrocatalyst for reducing nitrogen (N2) under ambient conditions to NH3. In this simple chemical strategy, Zn preferentially binds N2 over hydrogen (H2), Te, by virtue its superior electronic properties, enhances electrocatalytic...
Abstract Janus transition metal dichalcogenides, with intrinsic mirror asymmetry, exhibit a wide array of interesting properties. In this work, we study monolayers derived from WTe 2 using first-principles and tight-binding calculations. We discover that WSeTe WSTe are topologically trivial, in contrast to the parent quantum spin Hall insulator . Motivated by growing interest non-linear effect, which also requires asymmetric structures, investigate Berry curvature its dipole these systems...
The quantum Hall effect is one of the exclusive properties displayed by Dirac Fermions in topological insulators, which propagates along chiral edge state and gives rise to quantized electron transport. However, formed nondegenerate surface states has been elusive so far. Here, we demonstrate integer from three-dimensional (3D) insulator β-Ag2Te nanostructures. Surface-state dominant conductance renders plateaus with a step e2/h, typical thermopower behaviors two-dimensional (2D) massless...
The emergence of the fascinating non-linear Hall effect intrinsically depends on non-zero value Berry curvature dipole. In this work, we predict that suitable strain engineering in layered van der Waals material phosphorene can give rise to a significantly large Using symmetry design principles, and combination feasible staggered on-site potentials, show how substantial dipole may be engineered at Fermi level. We discover monolayer exhibits most intense peak near 11.8% strain, which is also...
This review presents recent breakthroughs in the realm of nonlinear Hall effects, emphasizing central theoretical foundations and experimental progress. We elucidate quantum origin second-order response, focusing on Berry curvature dipole, which may arise inversion symmetry broken systems. The framework also reveals impact disorder scattering effects response. further discuss possibility obtaining responses beyond second order. examine symmetry-based indicators essential for manifestation...
The Mott-Ioffe-Regel limit sets the lower bound of carrier mean free path for coherent quasiparticle transport. Metallicity beyond this is great interest because it often closely related to quantum criticality and unconventional superconductivity. Progress along direction mainly focuses on strange-metal behaviors originating from evolution scattering rate such as linear-in-temperature resistivity, while coherence phenomena in regime are much less explored due short at diffusive bound. Here...
We report a study of thickness-dependent interband and intraband magnetic breakdown by thermoelectric quantum oscillations in ZrSiSe nanoplates. Under high fields up to 30 T, arising from degenerated hole pockets were observed thick However, when decreasing the thickness, plentiful multifrequency originating electron are captured. These multiple frequencies can be explained emergent enclosing individual within spin–orbit coupling (SOC) induced saddle-shaped pockets, resulting enhanced...
The nonlinear generalization of the Hall effect has recently gained much attention, with a rapidly growing list noncentrosymmetric materials that display higher-order responses under time-reversal invariant conditions. intrinsic second-order response arises due to first-order moment Berry curvature─termed curvature dipole─which requires broken inversion and low crystal symmetries. Chiral are characterized by their lack improper symmetries such as inversion, mirror plane, roto-inversion....
Nanoparticles and nanostructures of two-dimensional semiconductors are being explored for their potential in photocatalysis, optoelectronics, energy harvesting applications. Herein, we investigate the size composition dependence electronic, structural, optical properties triangular transition metal dichalcogenide (MX2, M = Mo, W X S, Se, Te) nanoflakes. Structural optimizations reveal that, while all flakes undergo dimerization atoms along each edge, large WS2 flakes, edge S forms trimers....
Janus transition metal dichalcogenides, with intrinsic mirror asymmetry, exhibit a wide array of interesting properties. In this work, we study monolayers derived from WTe$_2$ using first-principles and tight-binding calculations. We discover that WSeTe WSTe are topologically trivial, in contrast to the parent quantum spin Hall insulator WTe$_2$. Motivated by growing interest non-linear effect, which also requires asymmetric structures, investigate Berry curvature its dipole these systems...
Photodetector based on two-dimensional (2D) materials is an ongoing quest in optoelectronics. These 2D photodetectors are generally efficient at low illuminating power but suffer severe recombination processes high power, which results the sublinear dependence of photoresponse and lower optoelectronic efficiency. The desirable superlinear photocurrent mostly achieved by sophisticated heterostructures or device arrays, while rarely show intrinsic photoresponse. Here, we report giant...
The chiral anomaly effect has been regarded as a hallmark of Weyl semimetals. While most research focuses on the change electrical conductivity due to charge-pumping effect, these transport measurements are accompanied by other effects such weak antilocalization which difficult exclude. Also, magnetic field intensity at energy dispersion Landau level starts display is hard identify. Here, we report evolutionary process zeroth under increasing fields, and elucidate relationship between Fermi...
The emergence of the fascinating non-linear Hall effect intrinsically depends on non-zero value Berry curvature dipole. In this work, we predict that suitable strain engineering in layered van der Waals material phosphorene can give rise to a significantly large Using symmetry design principles, and combination feasible staggered on-site potentials, show how substantial dipole may be engineered at Fermi level. We discover monolayer exhibits most intense peak near 11.8% strain, which is also...
The \ensuremath{\pi} phase shift of quantum oscillations is generally believed to be a smoking gun evidence for nontrivial Berry phase. However, the spin-zero effect, sign reversal at different magnetic field directions, adds an additional shift. Thus, curvature can concealed by resulting in apparent trivial oscillation measurements. In this work, we report hidden Weyl semiconductor Te nanowires. A trivial-like observed large $g$ factor, together with band evolution under fields, leads...
The anomalous Hall effect in time-reversal symmetry broken systems is underpinned by the concept of Berry curvature band theory. However, recent experiments reveal that nonlinear can be observed non-magnetic without applying an external magnetic field. emergence under symmetric conditions explained terms non-vanishing dipole arising from inversion breaking. In this work, we availed realistic tight-binding models, first-principles calculations, and analyses to explore combined transverse...
We report on low-energy electronic structure and correlations of K$_{0.65}$RhO$_2$, studied using high-resolution angle-resolved photoemission spectroscopy (ARPES) technique density functional theory (DFT) calculations. observe a highly correlated hole pocket the Fermi surface. further notice that are momentum dependent. Most importantly, two $kinks$ at binding energies 75 meV 195 have been observed from band dispersion in vicinity level. While low energy $kink$ can be understood as result...