Quantum Dot Lab

Prof. Ranjani Viswanatha has been elected as a Fellow of the Indian Academy of Sciences (IAS).

A well-deserved recognition of her outstanding contributions to science, mentorship, and leadership.
Heartiest congratulations on this remarkable achievement!

Thrilled to share some recent publications! 🎉
Earlier this year, our work titled “Chemical Strain-Induced Rashba Effect in Two-Dimensional Ruddlesden–Popper Perovskites” was published in Physical Review B. Our findings reveal how chemical strain can induce local asymmetry, enabling Rashba-type spin splitting, a promising pathway for next-generation quantum and spintronic technologies.
Building on this direction, we have also written a perspective titled “A Chemical Vision for the Future of Quantum Materials: Defect and Interface Engineering at the Nanoscale,” which has been accepted for publication in Nano Futures.
https://doi.org/10.1088/2399-1984/ae10f0
Grateful to all collaborators and mentors who made these works possible!

Excited to share that our manuscript titled “Plasmonic Field-Enhanced Zeeman Splitting in Ag-CsPbBr3 Hybrid Nanostructures: A Step toward Tunable Magneto-Optical Devices” has been published in The Journal of Physical Chemistry-JPC Letters

What initially started as a straightforward investigation into Ag doping in CsPbBr3 nanocrystals soon took a fascinating turn, as we realized that Ag does not readily incorporate into the perovskite lattice but instead tends to form distinct nanoparticles. This insight shifted our focus toward designing hybrid nanostructures where Ag nanoparticles were purposefully coupled with CsPbBr3 nanocrystals to harness plasmon–exciton interactions more effectively. Using localized surface plasmon resonance (LSPR) from Ag nanoparticles, we have observed significant enhancements in Zeeman splitting and magnetic circular dichroism near the nanocrystal band-edge.

Three nanoparticle arrangements- uniform, clustered, and mixed were compared, with the uniform configuration showing the strongest enhancement due to optimal exciton–plasmon overlap. The findings demonstrate the potential of plasmon–perovskite hybrids for magneto-optical sensing, spintronics, and quantum technologies highlighting the power of nanoscale design in tuning spin-resolved optical transitions.

Authored By- Gauttam Dash, Subham Das, Naveen Sheoron, Aravind Arun, and Ranjani Viswanatha
Curious about how we did it? Dive into the full story here DOI:

Plasmonic Field-Enhanced Zeeman Splitting in Ag-CsPbBr3 Hybrid Nanostructures: A Step toward Tunable Magneto-Optical Devices We present a systematic study of plasmon-enhanced magneto-optical (MO) effects in hybrid nanostructures composed of CsPbBr3 nanocrystals (NCs) coupled with silver (Ag) nanoparticles (NPs). By harnessing the intense local electric fields generated via localized surface plasmon resonance (LSPR) of Ag....