Light-driven superconductivity in K3C60 at elevated temperature

Wednesday, October 12, 2016 - 1:00pm

Speaker: Alice Cantaluppi, Max Planck Institute

Program Description

Non-equilibrium superconducting-like optical signatures have been observed in a sample of K3C60 upon photo-excitation at temperatures up to 100K. In this experiment a coherent distortion of the lattice is driven by means of intense ultrashort laser pulses, tuned at resonance with specific molecular vibrations. Changes in the low energy electrodynamics were then detected by means of THz time resolved spectroscopy at different delays from the excitation. Strikingly, at the peak of the out-of-equilibrium response, the light-induced conductivity spectrum is alike to the one of the equilibrium superconductor below the critical temperature of 20K. This emergent physics away of equilibrium could be explained in terms of non-linear coupling between different vibrational modes, which we are currently investigating using time resolved x-ray diffraction.

Bio

Born in Como, Italy on 12.01.1989.

PhD student at Max Planck Institute for structure and Dynamics of Solids in Hamburg, since October 2013.

From 2010 –> 2013 Master degree in Engineering Physics at Politecnico di Milano, Italy. Master thesis in Prof. Giulio Cerullo’s group, specialised in nonlinear optical techniques. I mainly worked in the development of ultrashort laser pulses and my thesis project was the development of a 2D electronic spectroscopy setup in the near infrared.

Since 2013 I am working in Prof. Dr. Andrea Cavalleri’s group in Hamburg, as a PhD student. The activity is focussed on the study and control of the ultrafast dynamics in strongly correlated materials, and in the use of strong field THz to control complex solids. I worked mostly on with the organic molecular system K3C60.

Light-driven superconductivity in K3C60 at elevated temperature
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