DEPARTMENT OF PHYSICS
Indian Institute of Technology Madras

Sunethra Ramanan

Sunethra Ramanan

Associate Professor

HSB 311

Ph.D. Ohio State University

📞 044 - 2257 4871

✉️ suna@iitm.ac.in

👤 Personal Home Page

Areas of Interest

✔ Nuclear Structure

✔ Renormalization Group approach

✔ Computational Many-body Physics

✔ Quantum dynamics

✔ Entanglement and Many-body systems

Current Research

Nuclear structure has undergone a revolution over the past two decades due to the progress made in developing effective low momentum interactions via the renormalization group evolution. These interactions are either used as inputs in a many-body calculation where medium effects are incorporated. One of the main goals is to study the physics of neutron star governed by the nucleon degrees of freedom, which are the inner layers of the crust and the outer layer of the core of the star. In particular we study superfluidity which is a crucial input for the thermal evolution of the stars and the correct explanation of the glitches. A closely related system that we study is a gas of ultra cold fermions which is backed by a plethora of experiments. In such systems, the scattering length can be tuned via Feshbach resonances to the unitary limit which ressembles the nuclear system which naturally has a large scattering length. A recent direction has been to understand the role played by entanglement in forming bound states in nuclear and atomic systems.

Students

Current PhD Students

✔ PH19D013 VISWANATHAN PL

✔ PH20D018 SREELEKSHMI PILLAI (Co-guidance)

✔ PH18D043 SOUMYABRATA PAUL (Co-guidance)

✔ PH22D051 ABHAY SINGH RATHORE

Recent Publications

  • ✔ Equation of state of superfluid neutron matter with low-momentum interactions. V. Palaniappan, S. Ramanan and M. Urban. Phys. Rev. C. 107. 025804. DOI: 10.1103/PhysRevC.107.025804. arXiv: https://arxiv.org/pdf/2211.01308.pdf 2023.
  • ✔ Pairing in pure neutron matter. S. Ramanan, M. Urban. EPJ ST (Review). 230 . 567 . 2021.
  • ✔ Low-momentum interactions for ultracold Fermi gases. M. Urban and S. Ramanan. Physical Review A. 103 . 063306 . 2021.
  • ✔ Manifestations of changes in entanglement and onset of synchronization in tomograms . Soumyabrata Paul, S. Lakshmibala, V. Balakrishnan and S. Ramanan . https://arxiv.org/abs/2112.13262 2021.
  • ✔ Neutron pairing with medium polarization beyond the Landau approximation. M. Urban and S. Ramanan. Physical Review C. 101 . 035803 . 2020.
  • ✔ Unveiling Regions in multi-scale Feynman Integrals using Singularities and Power Geometry. B. Ananthanarayan, Abhishek Pal, S. Ramanan and Ratan Sarkar. European Physics Journal C. 79 . 1 . 2019.
  • ✔ Screening and antiscreening of the pairing interaction in low-density neutron matter. S. Ramanan, M. Urban. Physical Review C. 98 . 024314 . 2018.
  • ✔ Triplet Pairing in Pure Neutron Matter. Sarath Srinivas (IIT M), S. Ramanan (IIT M). Physical Review C. 94 . 064303 . 2016.
  • ✔ BEC-BCS Crossover in Neutron Matter with Renormalization Group based Effective Interactions,. S. Ramanan (Indian Inst. Tech., Madras), M. Urban (IPN, Orsay),. Phys. Rev. C. 88. 054315 . 2013.
  • ✔ Local Projections of Low-Momentum Potentials,. K. A. Wendt (OSU), R. J. Furnstahl (OSU), S. Ramanan (Indian Inst. Tech., Madras),. Phys.Rev. C (2012) . 86. 014003. 2012.