|INDIAN INSTITUTE OF SCIENCE EDUCATION & RESEARCH, MOHALI|
Associate Professor (Physics)
Knowledge city, Sector 81, SAS Nagar,
Manauli PO 140306
Web: Dorai Group
I am an NMR spectroscopist whose research is poised at the interface of Physics and Biology. My current research interests include NMR Quantum Computing, NMR Metabolomics, Diffusion Studies using Gradient NMR, NMR of Nanomaterials, NMR Methodology Development and Biomolecular Structure and Dynamics Determination.
NMR Quantum Computing: The parallel implementation of the quantum Fourier transform (QFT) on qubits has been shown to have a positive impact on time-cost issues. Recent research in quantum computing has begun to focus on qudit quantum computers (that rely on non-binary quantum logic) as well as hybrid qubit-qudit quantum systems. We have implemented a parallel QFT using selective rotations and numerically optimized pulses on a hybrid qubit-qutrit NMR quantum computer. On-going research includes exploring multipartite entanglement in three qubit systems, quantum Zeno dynamics and decoherence of entangled states.
NMR of Carbon Nanotubes: We have investigated the utility of 19F NMR chemical shift anisotropy (CSA) in the structural characterization of different kinds of zigzag and chiral single-walled carbon nanotubes (SWNTs). A set of fluorine CSA parameters comprising the span, skew and isotropic chemical shift was computed for each form of the SWNTs and multi-dimensional CSA parameter correlation maps were constructed. We have shown that these correlations are able to clearly distinguish between the chiral and zigzag forms of fluorinated carbon nanotubes. On-going research includes studies of interactions of silver nanoparticles with biomolecules.
Diffusion Studies using NMR: Heteronuclear 3D DOSY (diffusion ordered spectroscopy) experiments are useful in elucidating the diffusion coefficients of a mixture, especially in cases where the proton 2D DOSY spectra show considerable overlap. We have performed a novel diffusion-edited 3D NMR experiment that incorporates a BEST-HMQC pulse sequence in its implementation. Along the same lines, we designed a 3D heteronuclear HMBC-based diffusion integrated DOSY experiment (which we call 3D COMPACT-IDOSY) and a 3D multiple-quantum DOSY experiment (3D MQ-DOSY) and demonstrated their efficacy on mixtures of small molecules. On-going research includes quantifying protein diffusion in simulated crowded environments and diffusion in a polymer network.