Dr. Ramandeep Singh Johal

   Associate Professor (Physics)
   Knowledge city, Sector 81, SAS Nagar,
   Manauli PO 140306

   Email: rsjohal[at]
   Telefax: +91-172-2240266
   Mob: (0)

Research Area: Thermodynamics and Statistical Physics

My recent research has shown that intimate connection between thermodynamics and information is going to play a central role in our understanding of quantum phenomena. Understanding thermal properties of nano-materials also demands a thermodynamic framework appropriate for systems at small scales.

I am interested in the interplay of work and heat in quantum systems and we address various issues like how fundamental notions of thermodynamics may be modified in the light of quantum theory. The study is also popularly addressed as "Quantum Thermodynamics". Heat engines using quantum working media provide a useful platform to analyze such issues.

Another line of enquiry is related to developing statistical mechanical tools for treating systems with long-range interactions. Issues like emergence of long-lived quasi-stationary states, ensemble inequivalence are addressed.

Selected Publications

  • Near-equilibrium universality and bounds on efficiency in quasi-static regime with finite source and sink, with R. Rai, Europhys. Lett. (EPL) vol. 113 (2016) 10006.
  • Estimating performance of Feynman's ratchet with limited information, with G. Thomas, J. Phys. A: Math. Theor. vol. 48 (2015) 335002.
  • Friction due to inhomogeneous driving of coupled spins in a quantum heat engine, with G. Thomas, Eur. Phys. J. B vol. 87 (2014) 166.
  • Prior information and inference of optimality in thermodynamic processes, with P. Aneja, J. Phys. A: Math. Theor. vol. 46 (2013) 365002.
  • Coupled Quantum Otto Cycle, with G. Thomas, Phys. Rev. E vol. 83 (2011) 031135.
  • Work extremum principle: Structure and function of quantum heat engines, with A. E. Allahverdyan and G. Mahler, Phys. Rev. E vol. 77 (2008) 041118.

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