43 citations · 91 across the 8 of their papers we have counts for
8 papers
Emergence of polar monoclinic phase in heterohalogen substituted CsGeX
Sourabh Vairat, Balachandra G. Hegde, Brajesh Tiwari +1
The occurrence of ferroelectricity in inorganic germanium-based halide perovskites has provided an alternative to oxide counterparts. Using first-principles methods, we have studie…
Feeble Metallicity and Robust Semiconducting Regime in Structurally Sensitive Ba(Pb, Sn)O Alloys
Ravi Kashikar, B. R. K. Nanda
Density functional calculations are carried out to study the symmetry and substitution-driven electronic phase transition in BaPbSnO. Two end members BaSnO and…
A Generic Slater-Koster Description of the Electronic Structure of Centrosymmetric Halide Perovskites
Ravi Kashikar, Mayank Gupta, B. R. K. Nanda
The halide perovskites have truly emerged as efficient optoelectronic materials and show the promise of exhibiting nontrivial topological phases. Since the bandgap is the determini…
Pressure and Inversion Symmetry Breaking Field Driven First Order Phase Transition and Formation of Dirac Circle in Perovskites
Ashish Kore, Ravi Kashikar, Mayank Gupta +2
Through model Hamiltonian studies and first-principle electronic structure calculations, we have examined the effect of inversion symmetry breaking (ISB) field and hydrostatic pres…
Defining the Topological Influencers and Predictive Principles to Engineer Band Structure of Halide Perovskites
Ravi Kashikar, Mayank Gupta, B. R. K. Nanda
Complex quantum coupling phenomena of halide perovskites are examined through ab-initio calculations and exact diagonalization of model Hamiltonians to formulate a set of fundament…
Second Neighbor Electron Hopping and Pressure Induced Topological Quantum Phase Transition in Insulating Cubic Perovskites
Ravi Kashikar, Bramhachari Khamari, B. R. K. Nanda
Perovskite structure is one of the five symmetry families suitable for exhibiting topological insulator phase. However, none of the halides and oxides stabilizing in this structure…
Universality in the Electronic Structure of 3d Transition Metal Oxides
Priyadarshini Parida, Ravi Kashikar, Ajit Jena +1
Electronic structure of strongly correlated transition metal oxides (TMOs) is a complex phenomenon due to competing interaction among the charge, spin, orbital and lattice degrees…
Topologically Invariant Double Dirac States in Bismuth based Perovskites: Consequence of Ambivalent Charge States and Covalent Bonding
Bramhachari Khamari, Ravi Kashikar, B. R. K. Nanda
Bulk and surface electronic structures, calculated using density functional theory and a tight-binding model Hamiltonian, reveal the existence of two topologically invariant (TI) s…