Cassi Welcome to my personal and professional website. My long-term research interests lie in using ultrafast techniques to explore and control phase competition and emergent order in condensed matter systems and other novel materials. Particularly, using targeted light excitation to selectively perturb lattice, electronic, and spin properties in complex systems. Selective perturbation can be used to identify important properties of the equilibrium state, but it can also be used to access new phases that cannot be generated in equilibrium.

I completed my undergraduate education in physics at MIT in 2008 and entered the physics PhD program at UIUC the following fall. I joined Laura Greene's group in 2009 to study unconventional superconductivity at an exciting time, shortly after the discovery of iron-based superconductors.

From November 2010 through January 2015, I collaborated with Andrea Cavalleri's group at the MPI for the Structure and Dynamics of Matter in Hamburg, Germany. Here I've turned my attention to another class of superconductors, the high-Tc cuprates. My research focused on using ultrafast laser techniques to understand and manipulate phase competition in these materials, with the goal of promoting superconductivity. Most of my work involved probing light-induced states with time-domain THz spectroscopy.

I graduated with my PhD from UIUC in 2015 and the following fall I joined UC Berkeley as a Miller Research Fellow, working with Alessandra Lanzara.

Latest News

Mar. 2017: Stefan Pabst and I are proud to announce the birth of our son, Alexander Friedrich Pabst, on March 3, 2017.

Jan. 2017: Thank you to the Physics Department at Boston College for a fantastic visit and for inviting me to give the Physics Colloquium on 1/25.

Dec. 2016: My latest paper, "Dynamical decoherence of the light induced interlayer coupling in YBa2Cu3O6+δ" has been published in Phys. Rev. B.

Oct. 2016: Thank you to the Materials Science and Engineering Department for a wonderful visit to Northwestern and for inviting me to give the MSE Colloquium on 10/4.

Publications

  • C. R. Hunt, D. Nicoletti, S. Kaiser, D. Proepper, M. Le Tacon, T. Loew, B. Keimer and A. Cavalleri. "Dynamical decoherence of the light induced interlayer coupling in YBa2Cu3O6+δ," Phys. Rev. B 94, 224303 (2016).
  • C. R. Hunt, D. Nicoletti, S. Kaiser, T. Takayama, H. Takagi, and A. Cavalleri. "Two distinct kinetic regimes for the relaxation of light-induced superconductivity in La1.675Eu0.2Sr0.125CuO4," Phys. Rev. B 91, 020505(R) (2015).
    Rapid Communication
    Editor's Suggestion
  • M. Först, A. Frano, S. Kaiser, R. Mankowsky, C. R. Hunt, J. J. Turner, G. L. Dakovski, M. P. Minitti, J. Robinson, T. Loew, M. Le Tacon, B. Keimer, J. P. Hill, A. Cavalleri, and S. S. Dhesi. "Femtosecond resonant soft x-ray diffraction links melting of charge order with light-enhanced coherent transport in YBa2Cu3O6.6," Phys. Rev. B 90, 184514 (2014).
  • D. Nicoletti, E. Casandruc, Y. Laplace, V. Khanna, C. R. Hunt, S. Kaiser, S. S. Dhesi, G. D. Gu, J. P. Hill, and A. Cavalleri. "Optically induced superconductivity in striped La2-xBaxCuO4 by polarization-selective excitation in the near infrared," Phys. Rev. B 90, 100503(R) (2014).
    Rapid Communication
  • S. Kaiser, C. R. Hunt, D. Nicoletti, W. Hu, I. Gierz, H. Y. Liu, M. Le Tacon, T. Loew, D. Haug, B. Keimer, and A. Cavalleri. "Optically induced coherent transport far above Tc in underdoped YBa2Cu3O6+δ," Phys. Rev. B 89, 184516 (2014).
  • C. R. Hunt*, W. Hu*, S. Kaiser*, D. Nicoletti*, I. Gierz, M. C. Hoffmann, M. Le Tacon, T. Loew, B. Keimer and A. Cavalleri. "Optically enhanced coherent transport in YBa2Cu3O6.5 by ultrafast redistribution of interlayer coupling," Nature Materials 13, 705–711 (2014).
  • H. Z. Arham, C. R. Hunt, W. K. Park, J. Gillett, S. D. Das, S. E. Sebastian, Z. J. Xu, J. S. Wen, Z. W. Lin, Q. Li, G. Gu, A. Thaler, S. Ran, S. L. Bud'ko, P. C. Canfield, D. Y. Chung, M. G. Kanatzidis, and L. H. Greene. "Detection of orbital fluctuations above the structural transition temperature in the iron pnictides and chalcogenides," Phys. Rev. B 85, 214515 (2012).
  • H. Z. Arham, C. R. Hunt, W. K. Park, J. Gillett, S. D. Das, S. E. Sebastian, Z. J. Xu, J. S. Wen, Z. W. Lin, Q. Li, G. Gu, A. Thaler, S. L. Budko, P. C. Canfield, and L. H. Greene. "Gap-like feature in the normal state of X(Fe1−x Cox)2As2, X = Ba, Sr and Fe1+yTe revealed by Point Contact Spectroscopy," J. Phys.: Conf. Ser. 400, 022001 (2012).
  • Laura H. Greene, Hamood Z. Arham, Cassandra R. Hunt, Wan Kyu Park. "Design of new superconducting materials, and Point-Contact Spectroscopy as a probe of strong electron correlations," J. of Supercond. and Novel Mag. 25, 2121-2126 (2012).
  • W. K. Park, C. R. Hunt, H. Z. Arham, Z. J. Xu, J. S. Wen, Z. W. Lin, Q. Li, G. D. Gu, and L. H. Greene. "Strong Coupling Superconductivity in Iron-Chalcogenide FeTe0.55Se0.45," (2009).

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