Research Goal

Finding new topological phases of matter has recently become an important goal in condensed matter physics. Primary examples for these new phases include a topological crystalline insulator, a topological Dirac semimetal, a topological Weyl semimetal, and a topological superconductor. Each of them is predicted to exhibit protect surface states with a unique set of topologically protected properties, which are distinct from that of the Dirac surface states observed in a topological insulator (such as Bi2Se3). Our goal is to realize these new topological phases in real crystal. Experimentally identifying these new crystal can tremendously deepen our knowledge of the physics of topological matter. Moreover, utilization of the protected properties in topological surface states can lead to future applications such as fault-tolerant topological quantum computers and low-power spintronic devices, which revolutionize our electronic and energy industry.

Journey of Perfection – Crystal Growth

In Dr Raman Sankar Laboratory, We study the fundamental properties of single crystals such as “Dirac Semi-metals, Surface Topological studies, Topological Insulators, Topological Crystalline Insulators, High Tc super conductors, Weyl Semi-metals, 2D materials, Thermoelectric materials, etc.,”.

Dirac Semimetals and Topological Insulators

A new discovered phase of semiconducting bulk materials are called as Topological insulators which surface contains electrons that are chiral, mass less, and conduct electricity. Dirac semimetals are compounds where similar exotic electrons may exist within the bulk solid.

Weyl Semimetals

A Weyl semimetal has distinct quantum states such as a topologically non-trivial metallic phase containing Weyl fermions in the bulk and Fermi arcs on the surface Recently, a family of compounds, consisting of tantalum arsenide, tantalum phosphide (TaP), niobium arsenide, and niobium phosphide, was predicted as a Weyl semimetal candidates.

Superconductors

Superconductors are materials which conduct high electricity when it reach below the critical temperature. Our group consistently works on super conducting single crystals, focusing in the areas of intermetallics, oxides, chalcogenides, pnictides, anisotropic crystal structures, and metal-insulator transitions.

Frustrated Magnets

Transition metals from d or f with unpaired electrons try to align at low temperatures, but occasionally the geometry makes impossible and renders them magnetically “frustrated” structures. Such geometries are up to few dimensions such as chains, ladders made from parallel chains, or triangles (like the Kagome net or hexagonal net).

Thermoelectrics

Thermoelecrics deals with the two principles power generation (Seebeck effect) & Peltier cooler (Peltier effect). The conversion of waste heat in to electricity or wise versa. Our lab focuses on power generation applications and investigate for the materials with enhanced thermoelectric properties.

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