Dr. Ravi Kumar got PhD at the Indian Institute of Technology (IIT) Delhi in 2022 under the supervision of Prof. Dr. Brajesh Kumar Mani. His PhD research specialized in Relativistic Coupled-Cluster (RCC)-based precision atomic structure calculations for potential atomic clock candidates. He developed advanced methods for incorporating electron correlation and relativistic effects. After that, as a postdoctoral researcher at IIT Delhi, he worked on the RCC theory and code development for dipole polarizability calculations in two-valence atomic systems — an important factor in atomic clock accuracy.

Then, as a postdoctoral research associate, he moved to the laboratory of Prof. Dr. Sandra Luber in the Department of Chemistry at the University of Zurich (UZH), Switzerland. He focused on developing the DFT-based CP2K molecular dynamics code, particularly methods for calculating Raman, vibrational, and Vibrational Circular Dichroism (VCD) spectra. He developed a linear-scaling, atomic-orbital-based linear response algorithm to compute first-order response densities, offering improvements over traditional molecular-orbital-based methods.

Now, as a postdoctoral research associate of our laboratory at Kindai University, he is working on a project related to the newly launched Grant-in-Aid for Transformative Research Areas (B), entitled “Establishment of single-molecule electron microscopy and its quantum applications,” which began in FY2024.

His publication list is below:

1. Ravi Kumar, Sandra Luber, Calculation of Vibrational Circular Dichroism Spectra Employing Nuclear Velocity Perturbation or Magnetic Field Perturbation Theory Using an Atomic-Orbital-Based Linear Response Approach, J. Phys. Chem. A Vol.129 (19), 4325-4336 (2025)

2. Ravi Kumar, Sandra Luber, Electric Dipole Polarizability Calculation for Periodic and Non-Periodic Systems using Atomic-Orbitals-based Linear Response Theory, Helv. Chim. Acta e202400130 (2025)

3. Palki Gakkhar, Ravi Kumar, D. Angom, and B. K. Mani, Fock-space relativistic coupled-cluster calculations of clock-transition properties in Pb2+ Phys. Rev. A Vol.110, 013119 (2024)

4. Ravi Kumar, D. Angom, and B. K. Mani, Fock-space perturbed relativistic coupled-cluster theory for electric dipole polarizability of onevalence atomic systems: Application to Al and In, Phys. Rev. A Vol.106, 032801 (2022)

5. Ravi Kumar, S. Chattopadhyay, D. Angom, and B. K. Mani, Relativistic coupled-cluster calculation of the electric dipole polarizability and correlation energy of Cn, Nh+ , and Og: Correlation effects from lighter to superheavy elements, Phys. Rev. A Vol.103, 062803 (2021)

6. Ravi Kumar, S. Chattopadhyay, D. Angom, and B. K. Mani, Fockspace relativistic coupled-cluster calculation of a hyperfine-induced $^1S_0 \rightarrow ^3P^o_0$ clock transition in Al+, Phys. Rev. A Vol.103, 022801 (2021)

7. Ravi Kumar, S. Chattopadhyay, B. K. Mani, and D. Angom, Electric dipole polarizability of group-13 ions using perturbed relativistic coupled-cluster theory: Importance of nonlinear terms, Phys. Rev. A Vol.101, 012503 (2020)