Jayakanth Ravichandran
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View article: Kinetic control of ferroelectricity in epitaxial barium titanate thin film capacitors
Kinetic control of ferroelectricity in epitaxial barium titanate thin film capacitors Open
Ferroelectricity is characterized by the presence of spontaneous and switchable macroscopic polarization, and understanding its scaling limits is crucial for fundamental research and technological innovation. Although indirect probes have …
View article: Phase‐Change Materials for Volatile Threshold Resistive Switching and Neuronal Device Applications
Phase‐Change Materials for Volatile Threshold Resistive Switching and Neuronal Device Applications Open
Volatile threshold resistive switching and neuronal oscillations in phase‐change materials, specifically those undergoing ‘metal‐to‐insulator’ transitions, offer unique attributes such as fast and low‐field volatile switching, tunability, …
View article: Atomic-scale confinement of strongly charged 180 degree domain wall pairs in ZrO2
Atomic-scale confinement of strongly charged 180 degree domain wall pairs in ZrO2 Open
Self organized polar textures can occur in ferroelectric materials across multiple length scales, from nanometer scale vortices and skyrmions, to mesoscopic stripe domains, and macroscopic twin patterns, making these phenomena central to c…
View article: Ruddlesden-Popper chalcogenides push the limit of mechanical stiffness and glass-like thermal conductivity in single crystals
Ruddlesden-Popper chalcogenides push the limit of mechanical stiffness and glass-like thermal conductivity in single crystals Open
Insulating materials featuring ultralow thermal conductivity for diverse applications also require robust mechanical properties. Conventional thinking, however, which correlates strong bonding with high atomic-vibration-mediated heat condu…
View article: Crystal Growth of Chalcogenides and Oxy-Chalcogenides Using Chloride Exchange Reaction
Crystal Growth of Chalcogenides and Oxy-Chalcogenides Using Chloride Exchange Reaction Open
Chalcogenides and oxy-chalcogenides, including complex chalcogenides and transition metal dichalcogenides, are emerging semiconductors with direct or indirect band gaps within the visible spectrum. These materials are being explored for va…
View article: Electrical contacts for high-performance optoelectronic devices of BaZrS3 single crystals
Electrical contacts for high-performance optoelectronic devices of BaZrS3 single crystals Open
View article: Towards Atomic-Scale Control over Structural Modulations in Quasi-1D Chalcogenides for Colossal Optical Anisotropy
Towards Atomic-Scale Control over Structural Modulations in Quasi-1D Chalcogenides for Colossal Optical Anisotropy Open
Optically anisotropic materials are sought after for tailoring the polarization of light. Recently, colossal optical anisotropy was reported in a quasi-one-dimensional chalcogenide, Sr1.125TiS3. Compared to SrTiS3, the excess Sr in Sr1.125…
View article: Phase-change materials for volatile threshold resistive switching and neuronal device applications
Phase-change materials for volatile threshold resistive switching and neuronal device applications Open
Volatile threshold resistive switching and neuronal oscillations in phase-change materials, specifically those undergoing metal-to-insulator and charge density wave transitions, offer unique attributes such as fast and low-field volatile s…
View article: Infrared Optical Anisotropy in Quasi‐1D Hexagonal Chalcogenide BaTiSe<sub>3</sub>
Infrared Optical Anisotropy in Quasi‐1D Hexagonal Chalcogenide BaTiSe<sub>3</sub> Open
Polarimetric infrared (IR) detection bolsters IR thermography by leveraging the polarization of light. Optical anisotropy, i.e., birefringence and dichroism, can be leveraged to achieve polarimetric detection. Recently, giant optical aniso…
View article: Extensive hydrogen incorporation is not necessary for superconductivity in topotactically reduced nickelates
Extensive hydrogen incorporation is not necessary for superconductivity in topotactically reduced nickelates Open
A key open question in the study of layered superconducting nickelate films is the role that hydrogen incorporation into the lattice plays in the appearance of the superconducting state. Due to the challenges of stabilizing highly crystall…
View article: Differing vibrational properties of halide and chalcogenide perovskite semiconductors and impact on optoelectronic performance
Differing vibrational properties of halide and chalcogenide perovskite semiconductors and impact on optoelectronic performance Open
We report a comparative study of temperature-dependent photoluminescence and structural dynamics of two perovskite semiconductors, the chalcogenide BaZrS3 3 and the halide CsPbBr3. 3 . These materials have similar crystal structures and di…
View article: A strategy for fabricating micro-scale freestanding single-crystalline complex oxide device arrays
A strategy for fabricating micro-scale freestanding single-crystalline complex oxide device arrays Open
We present a general fabrication strategy for freestanding single-crystalline complex oxide device arrays via wet chemical etching-based microfabrication processes and epitaxial lift-off. Here, we used 0.5Ba(Zr$_{0.2}$Ti$_{0.8}$)O$_3$-0.5B…
View article: Strain-driven stabilization of a room-temperature chiral multiferroic with coupled ferroaxial and ferroelectric order
Strain-driven stabilization of a room-temperature chiral multiferroic with coupled ferroaxial and ferroelectric order Open
Noncollinear ferroic materials are sought after as testbeds to explore the intimate connections between topology and symmetry, which result in electronic, optical and magnetic functionalities not observed in collinear ferroic materials. Fo…
View article: Kinetic control of ferroelectricity in ultrathin epitaxial Barium Titanate capacitors
Kinetic control of ferroelectricity in ultrathin epitaxial Barium Titanate capacitors Open
Ferroelectricity is characterized by the presence of spontaneous and switchable macroscopic polarization. Scaling limits of ferroelectricity have been of both fundamental and technological importance, but the probes of ferroelectricity hav…
View article: Non-destructive Imaging of Polar Domains and Crystallographic Symmetry in The Scanning Electron Microscope
Non-destructive Imaging of Polar Domains and Crystallographic Symmetry in The Scanning Electron Microscope Open
View article: A System Built for Both Deterministic Transfer Processes and Contact Photolithography
A System Built for Both Deterministic Transfer Processes and Contact Photolithography Open
A home‐built compact system that functions as both a transfer stage for deterministic transfer processes and a mask aligner for contact photolithography, is constructed. The precision translation sample stage and optical microscope are sha…
View article: Molten flux growth of single crystals of quasi-1D hexagonal chalcogenide BaTiS3
Molten flux growth of single crystals of quasi-1D hexagonal chalcogenide BaTiS3 Open
BaTiS 3 , a quasi-1D complex chalcogenide, has gathered considerable scientific and technological interest due to its giant optical anisotropy and electronic phase transitions. However, the synthesis of high-quality BaTiS 3 crystals, parti…
View article: Emergent Atomic Scale Polarisation Vortices in BaTiS3
Emergent Atomic Scale Polarisation Vortices in BaTiS3 Open
Topological defects, such as vortices and skyrmions in magnetic and dipolar systems, can give rise to properties that are not observed in typical magnets and dielectrics. Here, we report the discovery of long-range ordered periodic dipole …
View article: Growth of VO2-ZnS Thin Film Cavity for Adaptive Thermal Emission
Growth of VO2-ZnS Thin Film Cavity for Adaptive Thermal Emission Open
Low-weight, passive, thermal-adaptive radiation technologies are needed to maintain an operable temperature for spacecraft while they experience various energy fluxes. In this study, we used a thin-film coating with the Fabry-Perot (FP) ef…
View article: Bifunctional Noble Metal-free Ternary Chalcogenide Electrocatalysts for Overall Water Splitting
Bifunctional Noble Metal-free Ternary Chalcogenide Electrocatalysts for Overall Water Splitting Open
Hydrogen has been identified as a clean, zero carbon, sustainable, and promising energy source for the future, and electrochemical water splitting for hydrogen production is an emission-free, efficient energy conversion technology. A major…
View article: Molten flux growth of single crystals of quasi-1D hexagonal chalcogenide BaTiS3
Molten flux growth of single crystals of quasi-1D hexagonal chalcogenide BaTiS3 Open
BaTiS3, a quasi-1D complex chalcogenide, has gathered considerable scientific and technological interest due to its giant optical anisotropy and electronic phase transitions. However, the synthesis of high-quality BaTiS3 crystals, particul…
View article: Hydrogen is not necessary for superconductivity in topotactically reduced nickelates
Hydrogen is not necessary for superconductivity in topotactically reduced nickelates Open
A key open question in the study of layered superconducting nickelate films is the role that hydrogen incorporation into the lattice plays in the appearance of the superconducting state. Due to the challenges of stabilizing highly crystall…
View article: Vibrational properties differ between halide and chalcogenide perovskite semiconductors, and it matters for optoelectronic performance
Vibrational properties differ between halide and chalcogenide perovskite semiconductors, and it matters for optoelectronic performance Open
We report a comparative study of temperature-dependent photoluminescence and structural dynamics of two perovskite semiconductors, the chalcogenide BaZrS$_3$ (BZS) and the halide CsPbBr$_3$ (CPB). These materials have similar crystal struc…
View article: Epitaxial rare-earth doped complex oxide thin films for infrared applications
Epitaxial rare-earth doped complex oxide thin films for infrared applications Open
Rare earth dopants are one of the most extensively studied optical emission centers for a broad range of applications such as laser optoelectronics, sensing, lighting, and quantum information technologies due to their narrow optical linewi…
View article: Infrared Optical Anisotropy in Quasi-1D Hexagonal Chalcogenide BaTiSe3
Infrared Optical Anisotropy in Quasi-1D Hexagonal Chalcogenide BaTiSe3 Open
Polarimetric infrared detection bolsters IR thermography by leveraging the polarization of light. Optical anisotropy, i.e., birefringence and dichroism, can be leveraged to achieve polarimetric detection. Recently, giant optical anisotropy…
View article: The Hydrogen Evolution Activity of BaZrS3, BaTiS3, and BaVS3 Chalcogenide Perovskites
The Hydrogen Evolution Activity of BaZrS3, BaTiS3, and BaVS3 Chalcogenide Perovskites Open
Chalcogenide perovskites are a class of materials with electronic and optoelectronic properties desirable for solar cells, infrared optics, and computing. The oxide counterparts of these chalcogenides have been studied extensively for elec…
View article: Ruddlesden-Popper chalcogenides push the limit of mechanical stiffness and glass-like thermal conductivity in single crystals
Ruddlesden-Popper chalcogenides push the limit of mechanical stiffness and glass-like thermal conductivity in single crystals Open
Insulating materials featuring ultralow thermal conductivity for diverse applications also require robust mechanical properties. Conventional thinking, however, which correlates strong bonding with high atomic-vibration-mediated heat condu…
View article: A hybrid pulsed laser deposition approach to grow thin films of chalcogenides
A hybrid pulsed laser deposition approach to grow thin films of chalcogenides Open
Vapor-pressure mismatched materials such as transition metal chalcogenides have emerged as electronic, photonic, and quantum materials with scientific and technological importance. However, epitaxial growth of vapor-pressure mismatched mat…
View article: Photoconductive Effects in Single Crystals of BaZrS$_3$
Photoconductive Effects in Single Crystals of BaZrS$_3$ Open
Chalcogenide perovskites, such as BaZrS$_3$, are emerging semiconductors with potential for high photovoltaic power conversion efficiency. The role of defects in the efficiency of the generation and collection of photo-excited carriers has…
View article: Charge‐Density‐Wave Resistive Switching and Voltage Oscillations in Ternary Chalcogenide BaTiS<sub>3</sub>
Charge‐Density‐Wave Resistive Switching and Voltage Oscillations in Ternary Chalcogenide BaTiS<sub>3</sub> Open
Phase change materials, which show different electrical characteristics across the phase transitions, have attracted considerable research attention for their potential electronic device applications. Materials with metal‐to‐insulator or c…