Research fellow

Shekhar, Chandra
Chandra Shekhar
Group leader
Phone: +49 351 4646-3205

Topological Materials

Group Members

Kao, Ting-Hui
Ting-Hui Kao
Post-doctoral research scientist

Topological Materials

Kumar, Nitesh
Nitesh Kumar
Post-doctoral research scientist
Phone: +49 351 4646-3419

Topological Materials

Manna, Kaustuv
Kaustuv Manna
Post-doctoral research scientist
Phone: +49 351 4646-3205

Topological Materials

Rajamathi, Catherine
Catherine Rajamathi
Graduate student
Phone: +49 351 4646-2236

Topological Materials

Süß, Vicky
Vicky Süß
Research technician
Phone: +49 351 4646-2272

Topological Materials

Former Group Members

Sarah Watzman
Visiting graduate student

Publication Highlights

Chandra Shekhar, Ajaya K. Nayak, Yan Sun, Marcus Schmidt, Michael Nicklas, Inge Leermakers, Uli Zeitler, Yurii Skourski, Jochen Wosnitza, Zhongkai Liu, Yulin Chen, Walter Schnelle, Horst Borrmann, Yuri Grin, Claudia Felser, and Binghai Yan, "Extremely large magnetoresistance and ultrahigh mobility in the topological Weyl semimetal candidate NbP," Nature Physics , 645-649 (2015).
Chandra Shekhar, C. E. ViolBarbosa, Binghai Yan, Siham Ouardi, W. Schnelle, Gerhard H. Fecher, and Claudia Felser, "Evidence of surface transport and weak antilocalization in a single crystal of the Bi2Te2Se topological insulator," Physical Review B 90 (16), 1-6 (2014).
C. Shekhar, S. Ouardi, A. K. Nayak, G. H. Fecher, W. Schnelle, and C. Felser, "Ultrahigh mobility and nonsaturating magnetoresistance in Heusler topological insulators," Physical Review B 86 (15), 155314-1-155314-5 (2012).

Topological materials

Topological materials have newly been identified as quantum materials and their properties are highlighted by topology. Topology is a branch of mathematics where properties of objects that are invariant under smooth deformations are studied. Materials properties which are invariant under topological transformations property are known as topological materials. Topological insulators (TIs) are insulating in bulk and conducting at surface. In another class of topological materials, the bulk of the material is semimetal and their valence and conduction bands touch at near Fermi level. Depending on whether the bands are nondegenerate or doubly degenerate, topological material is called a topological Weyl semimetal or a topological Dirac semimetal. Properties of topological materials indicate the existence of Majorana, Weyl and Dirac fermions. Many of the compounds containing chalchogens and pnictogens have shown exotic properties e.g. FeAs-based high temperature superconductors, topological insulators, Weyl and Dirac semimetals, graphene analogues (transition metals chalcogenides) etc.

Our group expertise in single crystal growth and transport measurements, achieves synergy to realize new properties of materials by theoretical collaborations. We also welcome worldwide collaborations having similar or different thoughts and interests.

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