[CCoE Notice] (10:00 am US Central Time) Zoom Webinar: Ultrastrong Coupling in Condensed Matter * Friday, March 12 * Junichiro Kono * Rice University *

Knudsen, Rachel W riward at Central.UH.EDU
Wed Mar 10 11:38:57 CST 2021


                                                                            ***** Seminar *****

Department of Electrical and Computer Engineering

Texas Center for Superconductivity

Materials Engineering Program

Center for Integrated Bio and Nano Systems

  10:00 a.m., March 12, 2021


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Meeting ID: 845 619 943

Password: 016104



Ultrastrong Coupling in Condensed Matter

                                             Junichiro Kono
                             Department of Electrical and Computer Engineering
                      Department of Physics and Astronomy, and Department of Materials
                                   Science and NanoEngineering, Rice University

Abstract:. Recent advances in optical studies of condensed matter have led to the emergence of a variety of phenomena that have conventionally been studied in quantum optics. These studies have not only deepened our understanding of light-matter interactions but also introduced aspects of many-body effects inherent in condensed matter. This talk will describe our recent studies of Dicke cooperativity, i.e., many-body enhancement of light-matter interaction, a concept in quantum optics [1]. This enhancement has led to the realization of the ultrastrong coupling (USC) regime, where new phenomena emerge through the breakdown of the rotating wave approximation (RWA) [2]. We will first describe our observation of USC in a 2D electron gas in a high-Q THz cavity in a magnetic field [3]. The electron cyclotron resonance peak exhibited a polariton splitting with a magnitude that is proportional to the square-root of the electron density, a hallmark of Dicke cooperativity. Additionally, we obtained definitive evidence for the vacuum Bloch-Siegert shift [4], a signature of the breakdown of the RWA. The second part of this talk will present microcavity exciton polaritons in a thin film of aligned carbon nanotubes [5] embedded in a Fabry-Pérot cavity. This system exhibited cooperative USC with unusual continuous controllability over the coupling strength through polarization rotation [6]. Finally, we have shown that Dicke cooperativity also occurs in a magnetic solid in the form of matter-matter interaction [7]. Specifically, the exchange interaction of N paramagnetic Er3+ spins with an Fe3+ magnon field in ErFeO3 exhibited a Rabi splitting whose magnitude is proportional to N1/2. These results provide a route for understanding, controlling, and predicting novel phases of condensed matter using concepts and tools available in quantum optics.

1. For a review, see K. Cong, Q. Zhang, Y. Wang, G. T. Noe II, A. Belyanin, and J. Kono, J. Opt. Soc. Am. B 33, C80 (2016).
2. For a review, see P. Forn-Díaz, L. Lamata, E. Rico, J. Kono, and E. Solano, Rev. Mod. Phys. 91, 025005 (2019).
3. Q. Zhang et al., Nat. Phys. 12, 1005 (2016).
4. X. Li et al., Nat. Photon. 12, 324 (2018).
5. X. He et al., Nat. Nanotechnol. 11, 633 (2016).
6. W. Gao et al., Nat. Photon. 12, 362 (2018).
7. X. Li et al., Science 361, 794 (2018).

[cid:177e09ba-bd5f-4670-a106-7fe1202fb89e]

Short Bio:

Junichiro Kono received his B.S. and M.S. degrees in applied physics from the University of Tokyo in 1990 and 1992, respectively, and completed his Ph.D. in physics from the State University of New York at Buffalo in 1995. He was a postdoctoral research associate at the University of California, Santa Barbara, in 1995-1997 and the W. W. Hansen Experimental Physics Laboratory Fellow in the Department of Physics at Stanford University in 1997-2000. He joined the Department of Electrical and Computer Engineering of Rice University in 2000 as an Assistant Professor and was promoted to an Associate Professor in 2005 and to a Professor in 2009. He is currently Karl F. Hasselmann Chair in Engineering, serving as a Professor in the Departments of Electrical & Computer Engineering, Physics & Astronomy, and Materials Science & NanoEngineering as well as the Chair of the Applied Physics Graduate Program at Rice University. Professor Kono was a recipient of the National Science Foundation CAREER Award in 2002 and has been a Fellow of the American Physical Society (APS) since 2009, a Fellow of the Optical Society (OSA) since 2015, a Fellow of SPIE from 2019, and a Fellow of the Institute of Physics (IOP) since 2021. Professor Kono is also the founder of the nationally recognized international program for science and engineering undergraduate students, NanoJapan, funded by the U.S. National Science Foundation, receiving the Heiskell Award for Innovation from the Institute of International Education in 2008. Junichiro Kono received his B.S. and M.S. degrees in applied physics from the University of Tokyo in 1990 and 1992, respectively, and completed his Ph.D. in physics from the State University of New York at Buffalo in 1995. He was a postdoctoral research associate at the University of California, Santa Barbara, in 1995-1997 and the W. W. Hansen Experimental Physics Laboratory Fellow in the Department of Physics at Stanford University in 1997-2000. He joined the Department of Electrical and Computer Engineering of Rice University in 2000 as an Assistant Professor and was promoted to an Associate Professor in 2005 and to a Professor in 2009. He is currently Karl F. Hasselmann Chair in Engineering, serving as a Professor in the Departments of Electrical & Computer Engineering, Physics & Astronomy, and Materials Science & NanoEngineering as well as the Chair of the Applied Physics Graduate Program at Rice University. Professor Kono was a recipient of the National Science Foundation CAREER Award in 2002 and has been a Fellow of the American Physical Society (APS) since 2009, a Fellow of the Optical Society (OSA) since 2015, a Fellow of SPIE from 2019, and a Fellow of the Institute of Physics (IOP) since 2021. Professor Kono is also the founder of the nationally recognized international program for science and engineering undergraduate students, NanoJapan, funded by the U.S. National Science Foundation, receiving the Heiskell Award for Innovation from the Institute of International Education in 2008.


Please contact Dr. <mailto:yyao4 at uh.edu> Jiming Bao (jbao at uh.edu) if you want to meet with the speaker.


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