Nonlinear Response and Novel Spectroscopies

A revolution in experimental technique has opened remarkable new possibilities for probing and manipulating strongly correlated quantum matter. CCQ scientists are developing new theoretical approaches needed to analyze and understand the new classes of data.



Representation of polaritons (coupled light matter excitation) from Nano Lett. 2020, 20, 12, 8438-8445.

• Plasmonics and nano-optics: working with the Columbia experimental group of D. Basov we developing and applying theoretical methods to analyse and understand new information available from new classes of experiments launching plasmons from nano-antennas and probling the results in a spatially resolved way. Recent highlights include a demonstration of the Fizeau effect (arXiv:2012.09786) (dragging of electromagnetic waves by currents) and of doping of the Kitaev spin liquid material by graphene. (Nano Lett. 2020, 20, 12, 8438–8445)


Real-time evolution of excitonic order parameter during photexcitation at two different drive frequencies, from arXiv:2012.09786


• Nonlinear spectroscopy. A second dimension of the novel spectroscopy problem is the greatly improved ability of experimentalists to apply strong fields to materials. Recent highlights include our investigations of new nonlinear optics effects arising in correlated states. (arXiv:2012.09786)




  • Charge-Transfer Plasmon Polaritons at Graphene/α-RuCl_3 Interfaces, Daniel J. Rizzo, Bjarke S. Jessen, Zhiyuan Sun, Francesco L. Ruta, Jin Zhang, Jia-Qiang Yan, Lede Xian, Alexander S. McLeod, Michael E. Berkowitz, Kenji WatanabeKenji Watanabe, Takashi Taniguchi, Stephen E. Nagler, David G. Mandrus, Angel Rubio, Michael M. Fogler, Andrew J. Millis, James C. Hone, Cory R. Dean, and D. N. Basov. 1021/acs.nanolett.0c03466
  • Bulk photovoltaic effect driven by collective excitations in a correlated insulator, Tatsuya Kaneko, Zhiyuan Sun, Yuta Murakami, Denis Golež, Andrew J. Millis. arXiv:2012.09786


Project Leaders: Andrew Millis, Angel Rubio

Project Scientists: Olivier Parcollet

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