Indian Institute of Technology, Delhi
IIT Delhi
Physics Department
Quantum Materials Magneto-Transport Laboratory
Chiral topology: From discovery to future promises
Kaustuv Manna develops and investigates single-crystal platforms for chiral topological physics. The selected studies below connect his documented contributions in synthesis, crystal growth, and transport with specific electronic phenomena. These discoveries were made through strong collaborative teamwork, combining materials research, spectroscopy and theory.
RhSi, Ni-doped RhSi CoSi: From helicoid surface states to quantized CPGE
Prof. Kaustuv Manna at IIT Delhi has grown RhSi, CoSi and Ni-doped RhSi (Rh₁₋ₓNiₓSi) single crystals for collaborative investigations of chiral topology and photocurrent responses. Our single-crystal-growth contributions established chiral topology in CoSi and RhSi, revealing multifold fermions and the longest possible, Brillouin-zone-spanning helicoid Fermi arcs. Collaborative studies subsequently demonstrated helicity-dependent photocurrents in RhSi and giant circular photogalvanic effects (CPGE) in CoSi. Our 2026 preprint reports the observation of quantized CPGE in Ni-substituted RhSi, Rh₀.₉₅Ni₀.₀₅Si, connecting optical response directly to topological charge (arXiv:2607.12420).
For enquiries about crystal growth, current sample availability and research collaboration, contact kaustuvmanna@physics.iitd.ac.in.
CPGE investigations
PtGa: spin split Fermi arcs
We are proud that high-quality PtGa single crystals grown by Prof. Kaustuv Manna have made pioneering investigations of chiral quantum materials possible. These crystals enabled collaborative discoveries of giant spin-split Fermi arcs, charged nodal walls, Weyl spin–momentum locking and orbital angular momentum monopoles, alongside studies of catalytic functionality. Our crystal-growth expertise provided the indispensable material foundation on which these breakthrough investigations were built.
PdGa: Tuning of the topological charge
High-quality PdGa single crystals grown by Prof. Kaustuv Manna, including both structural enantiomers, have enabled pioneering investigations of chiral topology. These crystals made possible the observation and control of Chern numbers of magnitude four, handedness-dependent quantum interference, and orbital angular momentum monopoles. Their impact extends to asymmetric catalysis and a chiral fermionic valve. Our crystal-growth expertise provided the indispensable material foundation for these collaborative advances, connecting fundamental discoveries with future applications.
