Faculty Details

Areas of Interest

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

Current Research

My research is in the area of soft matter physics. With this principal theme, I study problems in statistical mechanics, fluid mechanics, and biophysics. Much of my current focus is on studying active particle suspensions. Active particles - such as microorganisms and synthetic microswimmers - are a class of colloids that create fluid flow even when they are stationary. Current research directions include: (a) studying the role of fluid-mediated interactions in determining the collective dynamics of active particles and (b) building continuum theories of active matter systems.

Students

Current PhD Students

Recent Publications

• Efficient Bayesian inference of fully stochastic epidemiological models with applications to COVID-19. Li, Yuting I; Turk, Günther; Rohrbach, Paul; Pietzonka, Patrick; Kappler, Julian; Singh, Rajesh; Dolezal, Jakub; Ekeh, Timothy; Kikuchi, Lukas; Peterson, Joseph D; . Royal Society Open Science. 8. 211065 .
  DOI: https://doi.org/10.1098/rsos.211065. 2021.
• Controlled optofluidic crystallization of colloids tethered at interfaces. Caciagli, Alessio; Singh, Rajesh; Joshi, Darshana; Adhikari, R; Eiser, Erika; . Physical Review Letter. 125. 68001.
  DOI: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.125.068001. 2020.
• PyStokes: phoresis and Stokesian hydrodynamics in Python. Singh, Rajesh; Adhikari, Ronojoy; . Journal of Open Source Software. 5. 2318.
  DOI: https://doi.org/10.21105/joss.02318. 2020.
• Self-propulsion of active droplets without liquid-crystalline order. Singh, Rajesh; Tjhung, Elsen; Cates, Michael E; . Physical Review Research. 2. 32024.
  DOI: https://dx.doi.org/10.1103/PhysRevResearch.2.032024. 2020.
• Ritz method for transition paths and quasipotentials of rare diffusive events. Kikuchi, Lukas; Singh, Rajesh; Cates, Mike E; Adhikari, Ronojoy; . Physical Review Research. 2. 33208.
  DOI: https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.2.033208. 2020.
• Periodic orbits of active particles induced by hydrodynamic monopoles. Bolitho, Austen; Singh, Rajesh; Adhikari, R; . Physical Review Letters. 124. 88003.
  DOI: https://doi.org/10.1103/PhysRevLett.124.088003. 2020.
• Hydrodynamically interrupted droplet growth in scalar active matter. Singh, Rajesh; Cates, ME; . Physical Review Letters. 123. 148005.
  DOI: https://dx.doi.org/10.1103/PhysRevLett.123.148005. 2019.
• Competing chemical and hydrodynamic interactions in autophoretic colloidal suspensions. Singh, Rajesh; Adhikari, R; Cates, ME; . The Journal of Chemical Physics. 151. 44901.
  DOI: https://dx.doi.org/10.1063/1.5090179. 2019.
• Electrohydrodynamic Assembly of Ambient Ion-Derived Nanoparticles to Nanosheets at Liquid Surfaces. Sarkar, D; Singh, R; Som, A; Manju, C K; Ganayee, M; Adhikari, R; Pradeep, T; . The Journal of Physical Chemistry C. 122. 17777.
  DOI: https://dx.doi.org/10.1021/acs.jpcc.8b04169. 2018.
• Flow-induced phase separation of active particles is controlled by boundary conditions. Thutupalli, Shashi; Geyer, Delphine; Singh, Rajesh; Adhikari, Ronojoy; Stone, Howard; . Proceedings of the National Academy of Sciences. 115. 5403.
  DOI: https://doi.org/10.1073/pnas.1718807115. 2018.
• Fast Bayesian inference of the multivariate Ornstein-Uhlenbeck process. Singh, Rajesh; Ghosh, Dipanjan; Adhikari, R; . Physical Review E. 98. 12136.
  DOI: https://dx.doi.org/10.1103/PhysRevE.98.012136. 2018.
• Generalized Stokes laws for active colloids and their applications. Singh, Rajesh; Adhikari, R; . Journal of Physics Communications. 2. 25025.
  DOI: https://dx.doi.org/10.1088/2399-6528/aaab0d. 2018.
• Direct verification of the fluctuation-dissipation relation in viscously coupled oscillators. Paul, Shuvojit; Laskar, Abhrajit; Singh, Rajesh; Roy, Basudev; Adhikari, R; Banerjee, Ayan; . Physical Review E. 96. 50102.
  DOI: https://doi.org/10.1103/PhysRevE.96.050102. 2017.
• Fluctuating hydrodynamics and the Brownian motion of an active colloid near a wall. Singh, Rajesh; Adhikari, R; . European Journal of Computational Mechanics. 26. 78.
  DOI: https://doi.org/10.1080/17797179.2017.1294829. 2017.
• Fast Bayesian inference of optical trap stiffness and particle diffusion. Bera, Sudipta; Paul, Shuvojit; Singh, Rajesh; Ghosh, Dipanjan; Kundu, Avijit; Banerjee, Ayan; Adhikari, R; . Scientific Reports. 7. 41638 .
  DOI: http://doi.org/10.1038/srep41638. 2017.
• Universal hydrodynamic mechanisms for crystallization in active colloidal suspensions. Singh, Rajesh; Adhikari, R; . Physical Review Letters. 117. 228002.
  DOI: https://doi.org/10.1103/PhysRevLett.117.228002. 2016.
• Many-body microhydrodynamics of colloidal particles with active boundary layers. Singh, Rajesh; Ghose, Somdeb; Adhikari, R; . Journal of Statistical Mechanics: Theory and Experiment. 2015. P06017.
  DOI: http://dx.doi.org/10.1088/1742-5468/2015/06/P06017. 2015.
• Phase-plane analysis of driven multi-lane exclusion models. Yadav, Vandana; Singh, Rajesh; Mukherji, Sutapa; . Journal of Statistical Mechanics: Theory and Experiment. 2012 . P04004.
  DOI: http://dx.doi.org/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