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 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).


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.

2D materials

2D materials are characterized by a sheet-like structure with a lateral size varying from nanometers up to micrometers, while their thickness is ranging from a single- to few-atomic thick layers. 2D materials; have brought a huge variant properties such as superconductors, metallic, semiconducting, and insulating. Our group focus to fabricate monolayer to few layered 2D single crystals with variant properties.

Group Leader

Dr. Raman Sankar

Assistant Research Scientist
Institute of Physics, Academia Sinica

sankarraman (at)

sankarndf (at)



Research Interest

Quantum matter, Quantum many-body physics, Fundamental condensed matter physics: Strongly correlated electrons, Topological phases of quantum matter, Quantum magnetism, Superconductivity, ARPES, Spin-ARPES, TR-ARPES, Resonant and Inelastic X-ray scattering, Advanced X-ray spectroscopy, X-ray free electron Lasers, Ultrafast physics, Crystal Growth techniques (Optical/IR Furnace, Bridgeman).

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