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Rohit Prativadi Prasankumar

Rohit Prasankumar

Email
Phone (505) 284-7966

Capabilities

  • CINT
  • Property Measurements

Expertise

Ultrafast dynamics and phenomena in complex quantum materials from terahertz to x-ray frequencies , including:

  • Complex oxides and oxide heterostructures (e.g., superconductors, manganites, and multiferroics)
  • Heavy fermion materials
  • Semiconductor nanostructures (particularly nanowires and quantum dots)
  • Two-dimensional nanosystems (e.g., graphene, topological insulators, and transition metal dichalcogenides)
  • Metamaterials and plasmonic devices
  • Organic and photovoltaic materials

Education

Ph.D., Electrical Engineering, Massachusetts Institute of Technology, May 2003

Thesis title: Development and Application of Saturable Absorbers to Femtosecond Solid-State Laser Mode-Locking

Advisor: Professor James G. Fujimoto

M. S., Electrical Engineering, Massachusetts Institute of Technology, September 1999

Thesis title: Novel Saturable Absorber Devices Grown Using RF and Magnetron RF Sputtering

B. S., Electrical Engineering, University of Texas at Austin, May 1997 (graduated magna cum laude)

Advisor: Professor Rebecca Richards-Kortum

 

Professional Appointments

Technical Staff Member, Laboratory for Ultrafast Materials and Optical Science (LUMOS), Center for Integrated Nanotechnologies (CINT), February 2006 - present

Acting Partner Scientific Leader, Nanophotonics Thrust (CINT), June 2009 - March 2010

Postdoctoral Researcher, LUMOS, MST-10 August 2003 - February 2006

 

Professional Societies

American Physical Society

Optical Society of America

 

Awards

  • Ernest and Virginia Cockrell Scholarship, University of Texas at Austin (1993-1997)
  • National Merit Scholarship (1993-1997)                                                                                 
  • One of ~20 students nationwide selected to attend the Lawrence Livermore Undergraduate Summer Institute for Applied Science (1996)
  • NSF Graduate Fellowship, Honorable Mention (1997)
  • I2CAM Junior Travel Award to attend Gordon Conference on Ultrafast Techniques (2008)
 

Publications

Books and Book Chapters:

1. “Using Ultrafast Optical Spectroscopy to Unravel the Properties of Correlated Electron Materials,” R. P. Prasankumar, D. A. Yarotski, and A. J. Taylor, in Encyclopedia of Modern Optics II, Volume 2, p. 123-149 (2018).

2. "Optical Techniques for Materials Characterization,” edited by R. P. Prasankumar and A. J. Taylor, Taylor & Francis (2011). 

3. "Emerging Optical Techniques for Characterizing Complex Materials," R. P. Prasankumar and A. J. Taylor, in Optical Techniques for Materials Characterization, Taylor & Francis (2011).

Selected Recent Publications (complete list at https://scholar.google.com/citations?view_op=list_works&hl=en&user=B24hpogAAAAJ):

  1. P. Bowlan, S. A. Trugman, D. A. Yarotski, A. J. Taylor, and R. P. Prasankumar, “Using ultrashort terahertz pulses to directly probe spin dynamics in insulating antiferromagnets,” J. Phys. D 51, 194003 (2018) (invited article).
  2. M. Dutta, K. Natarajan, S. Betal, R. P. Prasankumar, A. S. Bhalla and R. Guo, “Dynamically tunable and magnetic-field direction defined amplitude/phase mode selective THz wave modulation by core-shell magnetoelectric nanocomposites,” Nanoscale 9, 13052 (2017).
  3. B. Xu, Y. M. Dai, L. X. Zhao, K. Wang, R. Yang, W. Zhang, J. Y. Liu, H. Xiao, G. F. Chen, S. A. Trugman, J.-X. Zhu, A. J. Taylor, D. A. Yarotski, R. P. Prasankumar, and X. G. Qiu, “Temperature-tunable coupling between Weyl fermions and phonons in the Weyl semimetal TaAs,” Nature Communications 8, 14933 (2017).
  4. P. Bowlan, J. Bowlan, S. A. Trugman, R. Valdes-Aguilar, J. Qi, X. Liu, J. K. Furdyna, M. Dobrowolska, A. J. Taylor, D. A. Yarotski, and R. P. Prasankumar, “Probing and controlling terahertz-driven structural dynamics with surface sensitivity,” Optica 4, 383 (2017).
  5. B. Xu, Y. M. Dai, L. X. Zhao, K. Wang, R. Yang, W. Zhang, J. Y. Liu, H. Xiao, G. F. Chen, A. J. Taylor, D. A. Yarotski, R. P. Prasankumar, and X. G. Qiu, “Optical signatures of Weyl points in TaAs,” Phys. Rev. B (Rapid Comm.) 93, 121110(R) (2016).
  6. P. Bowlan, S. A. Trugman, J. Bowlan, J.-X. Zhu, N. J. Hur, A. J. Taylor, D. A. Yarotski, and R. P. Prasankumar, “Probing ultrafast spin dynamics in the antiferromagnetic multiferroic HoMnO3 through a magnon resonance,” Phys. Rev. B (Rapid Comm.) 94, 100400(R) (2016).
  7. Y. Dai, J. Bowlan, H. Li, H. Miao, Y. G. Shi, S. A. Trugman. J.-X. Zhu, H. Ding, A. J. Taylor, D. A. Yarotski, and R. P. Prasankumar, “Ultrafast carrier dynamics in the large magnetoresistance material WTe2,” Phys. Rev. B (Rapid Comm.) 92, 161104(R) (2015).
  8. N. Kamaraju, W. Pan, U. Ekenberg, D. M. Gvozdic, S. Boubanga-Tombet, P. C. Upadhya, J. Reno, A. J. Taylor, and R. P. Prasankumar, “Terahertz magneto-optical spectroscopy of a two-dimensional hole gas,” Appl. Phys. Lett. 106, 031902 (2015).
  9. Y.-M. Sheu, S. A. Trugman, L. Yan, Q. X. Jia, A. J. Taylor, and R. P. Prasankumar, “Ultrafast all-optical manipulation of interfacial-magnetoelectric coupling,” Nature Communications 5, 5832 (2014).
  10. K. Appavoo, N. F. Brady, B. Wang, M. A. Seo, J. Nag, R. P. Prasankumar, S. T. Pantelides, D. J. Hilton, and R. F. Haglund, Jr., “Ultrafast phase transition via catastrophic phonon collapse driven by plasmonic electron injection,” Nano Lett. 14, 1127 (2014).

Selected Recent Invited Presentations:

  1. "Using ultrashort light pulses to probe and control quasiparticle dynamics in topological materials," APS March Meeting (2018).
  2. “Using ultrafast terahertz spectroscopy to study low energy excitations in quantum materials,” SPIE Optics and Photonics (2017).
  3. “Ultrafast carrier capture and recombination in single III-nitride nanowires,” SPIE Optics and Photonics (2017).
  4. “Using ultrashort light pulses to probe and control dynamics in multiferroics,” International Meeting on Ferroelectricity (2017).
  5. “Using ultrashort optical pulses to unravel the interplay between electronic and magnetic phenomena in heavy fermion and multiferroic materials,” International Conference on Strongly Correlated Electron Systems, (2017).
  6. “Using ultrafast terahertz spectroscopy to study low energy excitations in quantum materials,” MRS Spring Meeting (2017).
 
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