Faculty Details

Areas of Interest

• Statistical Physics
• Soft Matter
• Fluid Dynamics
• Bayesian Statistics
• Active Matter

Current Research

The broad research interests of our group are in the field of theoretical soft condensed matter physics. With this principal theme, we study problems in statistical mechanics, fluid mechanics, computational physics, biophysics, and Bayesian statistics. In particular, the current focus is on studying the physics of soft, active, and living materials.

Students

Current PhD Students

• PH22D800    ARVIN GOPAL SUBRAMANIAM
• PH20D205    KINGSHUK PANJA
• PH22D091    MAYURAKSHI DEB

Recent Publications

• Morphologies of electric-field-driven cracks in dried dispersions of ellipsoids . M Emerse, H Lama, MG Basavaraj, R Singh, and DK Satapathy. Phys. Rev. E. 109. 024604.
  DOI: 10.1103/PhysRevE.109.024604. 2024.
• Rigid flocks, undulatory gaits, and chiral foldamers from chemical self-interaction in a freely-jointed active colloidal chain . AG Subramaniam, M Kumar, S Thutupalli, R Singh. arXiv.
  DOI: 10.48550/arXiv.2310.01572. 2024.
• Nonlinear dynamics of a microparticle in a hydro-thermophoretic trap . K Panja, J Goswami, G Nalupurackal, S Chakraborty, S Roy, B Roy, and R Singh. Results in Physics. 61. 107709.
  DOI: 10.1016/j.rinp.2024.107709. 2024.
• Studying fluctuating trajectories of optically confined passive tracers inside cells provides familiar active forces . U Nakul, S Roy, G Nalupurackal, S Chakraborty, P Siwach, J Goswami, P Edwina, SK Bajpai, R Singh, and B Roy. Biomedical Optics Express. 14. 5440.
  DOI: 10.1364/BOE.499990. 2023.
• Microhydrodynamics of an autophoretic particle near a plane interface . G Turk, R Adhikari, and R Singh. arXiv.
  DOI: 10.48550/arXiv.2310.01572. 2023.
• Depletion zone in two-dimensional deposits of soft microgel particles . M Jose, R Singh, and D Satapathy. J. Colloid Interface Sci. 642. 364-372.
  DOI: 10.1016/j.jcis.2023.03.076. 2023.
• Emergent rigidity in chemically self-interacting flexible active polymers . M Kumar, A Murali, A G Subramaniam, R Singh, S Thutupalli. arXiv: https://arxiv.org/abs/2303.10742 2023.
• Triple-line dynamics of a soft colloid-laden drop on a hydrophobic surface . M Jose, R Singh, and D Satapathy. Soft Matter. 19. 1803-1812.
  DOI: 10.1039/D2SM01486F. 2023.
• A hydro-thermophoretic trap for microparticles near a gold-coated substrate . G Nalupurackal, M Gunaseelan, S Roy, M Lokesh, S Kumar, R Vaippully, R Singh, and B Roy. Soft Matter. 18. 6825-6835.
  DOI: 10.1039/D2SM00627H . 2022.
• Stokes traction on an active particle . G Turk, R Singh, and R Adhikari. Phys. Rev. E. 106. 014601-014612.
  DOI: 10.1103/PhysRevE.106.014601. arXiv: https://arxiv.org/abs/2109.02581 2022.
• Efficient Bayesian inference of fully stochastic epidemiological models with applications to COVID-19. YI Li et al.. R. Soc. Open Sci. 8. 211065 .
  DOI: 10.1098/rsos.211065. 2021.
• Periodic orbits of active particles induced by hydrodynamic monopoles. A Bolitho, R Singh, and R Adhikari. Phys. Rev. Lett. 124. 88003.
  DOI: 10.1103/PhysRevLett.124.088003. 2020.
• Ritz method for transition paths and quasipotentials of rare diffusive events. L Kikuchi, R Singh, ME Cates, and R Adhikari. Phys. Rev. Research. 2. 33208.
  DOI: 10.1103/PhysRevResearch.2.033208. 2020.
• Self-propulsion of active droplets without liquid-crystalline order. R Singh, E Tjhung, and ME Cates. Phys. Rev. Research. 2. 32024.
  DOI: 10.1103/PhysRevResearch.2.032024. 2020.
• PyStokes: phoresis and Stokesian hydrodynamics in Python. R Singh, and R Adhikari. J. Open Source Software. 5. 2318.
  DOI: 10.21105/joss.02318. 2020.
• Controlled optofluidic crystallization of colloids tethered at interfaces. A Caciagli, R Singh, D Joshi, R Adhikari, and E Eiser. Phys. Rev. Lett. 125. 68001.
  DOI: 10.1103/PhysRevLett.125.068001. 2020.
• Competing chemical and hydrodynamic interactions in autophoretic colloidal suspensions. R Singh, R Adhikari, and ME Cates. J. Chem. Phys. 151. 44901.
  DOI: 10.1063/1.5090179. 2019.
• Hydrodynamically interrupted droplet growth in scalar active matter. R Singh, and ME Cates. Phys. Rev. Lett. 123. 148005.
  DOI: 10.1103/PhysRevLett.123.148005. 2019.
• Generalized Stokes laws for active colloids and their applications. R Singh, and R Adhikari. J. Phys. Commun. 2. 25025.
  DOI: 10.1088/2399-6528/aaab0d. 2018.
• Fast Bayesian inference of the multivariate Ornstein-Uhlenbeck process. R Singh, D Ghosh, and R Adhikari. Phys. Rev. E. 98. 12136.
  DOI: 10.1103/PhysRevE.98.012136. 2018.
• Flow-induced phase separation of active particles is controlled by boundary conditions. S Thutupalli, D Geyer, R Singh, R Adhikari, and HA Stone. Proc. Natl. Acad. Sci. 115. 5403.
  DOI: 10.1073/pnas.1718807115. 2018.
• Electrohydrodynamic Assembly of Ambient Ion-Derived Nanoparticles to Nanosheets at Liquid Surfaces. D Sarkar, R Singh, A Som, CK Manju, MA Ganayee, R Adhikari, and T Pradeep. J. Phys. Chem. C. 122. 17777.
  DOI: 10.1021/acs.jpcc.8b04169. 2018.
• Fast Bayesian inference of optical trap stiffness and particle diffusion. S Bera, S Paul, R Singh, D Ghosh, A Kundu, A Banerjee, and R Adhikari. Sci. Rep. 7. 41638 .
  DOI: 10.1038/srep41638. 2017.
• Fluctuating hydrodynamics and the Brownian motion of an active colloid near a wall. R Singh, and R Adhikari. Eur. J. Comp. Mech. 26. 78.
  DOI: 10.1080/17797179.2017.1294829. 2017.
• Direct verification of the fluctuation-dissipation relation in viscously coupled oscillators. S Paul, A Laskar, R Singh, B Roy, R Adhikari, and A Banerjee. Phys. Rev. E. 96. 50102.
  DOI: 10.1103/PhysRevE.96.050102. 2017.
• Universal hydrodynamic mechanisms for crystallization in active colloidal suspensions. R Singh, and R Adhikari. Phys. Rev. Lett. 117. 228002.
  DOI: 10.1103/PhysRevLett.117.228002. 2016.
• Many-body microhydrodynamics of colloidal particles with active boundary layers. R Singh, S Ghose, and R Adhikari. J. Stat. Mech. 2015. P06017.
  DOI: 10.1088/1742-5468/2015/06/P06017. 2015.
• Phase-plane analysis of driven multi-lane exclusion models. V Yadav, R Singh, and S Mukherji. J. Stat. Mech. 2012 . P04004.
  DOI: 10.1088/1742-5468/2012/04/P04004. 2012.

Teaching

• 2022 :  (Jan - May) - PH1020 - Physics II ; (Jul - Nov) PH1010 Physics I
• 2023 :  (Jan - May) - PH1020 - Physics II ; (Jul - Nov) PH1010 Physics I
• 2024 :  (Jan - May) - PH5020 Electromagnetic Theory; (Jul - Nov) PH5490 Advanced Statistical Physics