A5024271400- Heusler alloys: electronic and magnetic properties
- 2D Materials and Applications
- MXene and MAX Phase Materials
- Magnetic properties of thin films
- Advanced Thermoelectric Materials and Devices
- Organic and Molecular Conductors Research
- Shape Memory Alloy Transformations
- Graphene research and applications
- Magnetic and transport properties of perovskites and related materials
- Topological Materials and Phenomena
- Quantum many-body systems
- Solid-state spectroscopy and crystallography
- Semiconductor materials and interfaces
- Crystal Structures and Properties
- Semiconductor materials and devices
- Intermetallics and Advanced Alloy Properties
- Iron-based superconductors research
- Machine Learning in Materials Science
- Conducting polymers and applications
- Electronic and Structural Properties of Oxides
- Advanced Battery Materials and Technologies
- Quantum and electron transport phenomena
- Chalcogenide Semiconductor Thin Films
- Flame retardant materials and properties
- Inorganic Chemistry and Materials
Raja Ramanna Centre for Advanced Technology
2019-2024
Homi Bhabha National Institute
2019-2024
LaTe3 is a non-centrosymmetric material with time reversal symmetry, where the charge density wave hosted by Te bilayers. Here, we show that hosts Kramers nodal line-a twofold degenerate line connecting reversal-invariant momenta. We use angle-resolved photoemission spectroscopy, functional theory an experimentally reported modulated structure, effective band structures calculated unfolding, and symmetry arguments to reveal line. Furthermore, calculations confirm imposes gapless crossings...
A combined study employing density functional theory (DFT) using the experimentally determined modulated structures in martensite phase and bulk-sensitive hard x-ray photoelectron spectroscopy of stoichiometric single-crystalline ${\mathrm{Ni}}_{2}\mathrm{MnGa}$ is presented this paper. The experimental valence band (VB) features closely match theoretical VB calculated by DFT generalized gradient approximation for both austenite phases. We establish existence a charge wave (CDW) state from...
Recent studies have focused on the relationship between charge density wave (CDW) collective electronic ground states and nontrivial topological states. Using angle-resolved photoemission functional theory, we establish that YTe$_3$ is a CDW-induced Kramers nodal line (KNL) metal, newly proposed state of matter. non-magnetic quasi-2D chalcogenide with CDW vector ($q_{\rm cdw}$) 0.2907c$^*$. Scanning tunneling microscopy low energy electron diffraction revealed two orthogonal domains, each...
Half-metallic Co-based full Heusler alloys are gaining significant interest in spintronics due to their exceptional properties, including high spin polarization at the Fermi level, ultra-low Gilbert damping, and elevated Curie temperature.
Stanene, a two-dimensional counterpart to graphene, has the potential exhibit novel quantum phenomena when grown on magnetic topological insulator (MTI). This work demonstrates formation of up bilayer stanene 30% Sb-doped ${\mathrm{MnBi}}_{2}{\mathrm{Te}}_{4}$ (MBST), well-known MTI, albeit with buffer layer (BL) in between. Angle-resolved photoemission spectroscopy (ARPES), combined density functional theory (DFT), reveals stanene-related bands such as two holelike and an inverted parabolic...
Abstract Lithium–sulfur (Li–S) batteries are considered as a viable technology offering energy‐dense electrochemical energy storage systems. However, the inherently slow reaction kinetics manifested in charge and discharge characteristics constrain their real‐world applications. Here, it is reported that polyiodide species held within complex polar network of polyvinylpyrrolidone (PVP) accelerate rate‐limiting solid‐liquid phase transitions both reduction oxidation steps during battery...
A two-dimensional superconducting adlayer grown on a magnetic topological insulator (MTI) has the potential to exhibit proximity induced superconductivity, facilitate existence of Majorana fermions and find applications in field quantum computing. In this work, we demonstrate formation bilayer stanene an MTI substrate, specifically Mn(Bi$_{0.74}$Sb$_{0.26}$)$_2$Te$_4$ (MBST), through utilization combination techniques such as angle-resolved photoemission spectroscopy (ARPES), scanning...
The GaAs/AlGaAs quantum well (QW) system is utilized to investigate the electron spin relaxation in satellite X valley of indirect band gap ${\mathrm{Al}}_{0.63}{\mathrm{Ga}}_{0.37}\mathrm{As}$ epitaxial layers through polarization-resolved photoluminescence (PL) excitation spectroscopy. Solving rate equations, steady-state electronic distribution various valleys ${\mathrm{Al}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}$ estimated against continuous photocarrier generation, and an...
Using electronic structure calculations based on density functional theory, we predict and study the structural, mechanical, electronic, magnetic transport properties of a new full Heusler chalcogenide, namely, Fe$_2$CrTe, both in bulk heterostructure form. The system shows ferromagnetic half-metallic(HM) like behavior, with very high (about 95%) spin polarization at Fermi level, its cubic phase. Interestingly, under tetragonal distortion, clear minimum (with almost same energy as phase) has...
Half-metallic Co-based full Heusler alloys have captured considerable attention of the researchers in realm spintronic applications, owing to their remarkable characteristics such as exceptionally high spin polarization at Fermi level, ultra-low Gilbert damping, and Curie temperature. In this comprehensive study, employing density functional theory, we delve into stability electron transport properties a magnetic tunneling junction (MTJ) comprising Co$_2$MnSb/HfIrSb interface. Utilizing...
A combined study employing density functional theory (DFT) using the experimentally determined modulated structures and bulk-sensitive hard x-ray photoelectron spectroscopy on single-crystalline Ni$_2$MnGa is presented in this work. For aforementioned structures, all of characteristic features experimental valence band (VB) are excellent agreement with theoretical VB calculated from DFT, evincing that it true representation martensite phase. We establish existence a charge wave (CDW) state...
In this work, employing density functional theory based electronic structure calculations, we demonstrate the possibility of designing an all-Heusler alloy magnetic tunneling junction, with half-metallic (HM) Co2MnSb as electrode and non-magnetic semi-conducting (SC) TiCoSb spacer material. We probe robustness HM properties Mn-Sb/Co interface show that property is preserved, even various disorders defects. The spin-dependent transport behavior indicates their depend sensitively on...
LaTe$_3$ is a noncentrosymmetric (NC) material with time reversal (TR) symmetry in which the charge density wave (CDW) hosted by Te bilayers. Here, we show that hosts Kramers nodal line (KNL), twofold degenerate connects TR invariant momenta NC achiral systems, using angle resolved photoemission spectroscopy (ARPES), functional theory (DFT), effective band structure (EBS) calculated unfolding, and arguments. DFT incorporating spin-orbit coupling (SOC) reveals KNL -- protected lattice...