# Siddharth Parameswaran

# Siddharth Parameswaran

Associate Professor

I am a theoretical physicist, and my work focuses on quantum mechanical systems of many particles that are strongly interacting, far from equilibrium, or both.

Systems of interacting particles can display a variety of emergent cooperative phenomena that cannot be understood from their microscopic details. Usually, the study of this type of "condensed matter" builds on two key principles, namely (i) that most situations can be understood by approximately treating the constituents (such as electrons, atoms, or molecules) as weakly interacting; and (ii) that the assumption of thermal equilibrium provides a powerful way to capture the properties of complex systems using simple statistical tools.

I'm interested in what happens when quantum systems are so strongly interacting, or so dramatically disturbed from equilibrium, that these guiding principles break down. A new set of analytical and computational ideas is therefore required to fully understand the behavior of such systems, and to explore their properties. Besides their great fundamental interest, many of the new phenomena displayed in these extreme regimes could have many important applications. Insights into weakly-correlated, equilibrium systems fueled the technological revolution of the second half of the twentieth century; what new and unexpected benefits might we accrue from understanding their more complex cousins?

My research is supported by the Horizon 2020 Program of the European Research Council via a Starting Grant focused on Topological Matter and Crystalline Symmetries [Grant No. 804213-TMCS] and by a UK Engineering and Physical Sciences Research Council grant to the Oxford Condensed Matter Theory group on Coherent Many-Body Quantum States of Matter [EP/S020527/1].

In 2018-19 I am slated to give lectures for the C6 theory option for MPhys students; these also constitute the Advanced Quantum Theory course in the Oxford MMathPhys course.

I am a Tutorial Fellow of Hertford College. I typically tutor the second-year students in Mathematical Methods and Quantum Mechanics (A3) and statistical/thermal physics (A1), and the 3rd year Condensed Matter (B6) course.