Dynamical control of phases and time crystals in an atom-cavity system


  • Jayson Cosme ⋅ PH National Institute of Physics, University of the Philippines Diliman


Periodic driving of strongly correlated systems has led to outstanding discoveries from light-induced superconductivity to time crystals. To gain insights into the fundamental nature of these phenomena, we have recently studied the effects of an external periodic driving in a well-controlled yet simple many-body platform consisting of a Bose-Einstein condensate inside a high-finesse optical cavity. This system hosts a competition between a homogeneous condensate phase and a self-organized density wave phase, which manifests in a superradiant phase transition as the intensity of a transverse pump beam is increased. We demonstrate dynamical control of this phase transition by periodic driving of the pump laser. Furthermore, we discover the emergence of genuine dynamical phases, namely a discrete time crystalline phase and nonequilibrium density wave orders. Accompanying experimental results confirm our theoretical predictions about light-induced control in the atom-cavity system.

About the Speaker

Jayson Cosme, National Institute of Physics, University of the Philippines Diliman

Jayson Cosme is a theoretical physicist working at the interface between quantum optics and condensed matter physics. He earned his PhD in Physics at Massey University, New Zealand, where he studied several dynamical phenomena in quantum many-body systems including quench dynamics of a Bose-Einstein condensate and quantum thermalisation of isolated bosons. He moved to the University of Hamburg, Germany as a postdoctoral scientist to continue his research on the exciting and challenging field of nonequilibrium physics in various condensed matter platforms. He returned to the Philippines to join the National Institute of Physics at the University of the Philippines Diliman as an associate professor. His recent work focuses on the use of light for controlling equilibrium properties and realising dynamical phases of matter, such as time crystals, in cold atoms and superconductors.



Article ID



Invited Presentations



How to Cite

J Cosme, Dynamical control of phases and time crystals in an atom-cavity system, Proceedings of the Samahang Pisika ng Pilipinas 38, SPP-2020-INV-5C-01 (2020). URL: https://proceedings.spp-online.org/article/view/SPP-2020-INV-5C-01.