• Technical Conference: 

    15 – 20 May 2022

  • Exhibition: 

    17 – 19 May 2022

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Virtual: Exciton and Phonon Dynamics in Quantum Materials

Presider: Chaw-Keong Yong, National Taiwan University

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5:00 - 5:15

Ultrafast Dynamics of a Photoexcited and Periodically-Driven Dirac Semimetal Cd3as2 Studied by Multiterahertz Time-Domain Spectroscopy (FM1A.1)
Presenter: Natsuki Kanda, ISSP, Univ. of Tokyo

We investigated ultrafast broadband (12-45 THz) response functions of a photoexcited Dirac semimetal Cd3As2. Under periodic driving at 30 THz, we observed coherent nonlinear response dominated by stimulated Rayleigh scattering between the photon-dressed states.

Authors:Natsuki Kanda, ISSP, Univ. of Tokyo / Yuta Murotani, ISSP, Univ. of Tokyo / Tatsuhiko Ikeda, ISSP, Univ. of Tokyo / Takuya Matsuda, ISSP, Univ. of Tokyo / Manik Goyal, University of California, Santa Barbara, / Jun Yoshinobu, ISSP, Univ. of Tokyo / Yohei Kobayashi, ISSP, Univ. of Tokyo / Susanne Stemmer, University of California, Santa Barbara, / Ryusuke Matsunaga, ISSP, Univ. of Tokyo


5:15 - 5:30

Two-Dimensional Terahertz Spectroscopy of Coupling Between Fundamental Excitations in Solids (FM1A.2)
Presenter: Jeremy Johnson, Brigham Young University

Using two-dimensional (2D) terahertz spectroscopy we investigate fundamental electronic, lattice, and spin excitations in solids, and the couplings between them.

Authors:Brittany Knighton, Brigham Young University / Megan Nielson, Brigham Young University / Lauren Davis, Brigham Young University / Aldair Alejandro, Brigham Young University / Emma Nelson, Brigham Young University / Clayton Moss, Brigham Young University / Jeremy Johnson, Brigham Young University


5:30 - 5:45

Fermi Edge Singularity in Ultracold Neutral Electron Hole Plasma (FM1A.3)
Presenter: Darius Choksy, University of California San Diego

We studied electron-hole plasma in separated electron and hole layers. We observed a strong enhancement of photoluminescence intensity at the Fermi energy of the ultracold plasma that evidences the emergence of excitonic Fermi edge singularity.

Authors:Darius Choksy, University of California San Diego / Erik Szwed, University of California San Diego / Leonid Butov, University of California San Diego / Kirk Baldwin, Princeton University / Loren Pfeiffer, Princeton University


5:45 - 6:00

Valley-Polarized Hyperbolic-Exciton-Polaritons in 2D Semiconductors (FM1A.4)
Presenter: Tomer Eini, Tel Aviv University

We predict hyperbolic-exciton-polaritons existing in 2D semiconductors and derive their dispersion, confinement and loss characteristic, finding large momemntum polaritons that can couple to the TMD valley degree-of-freedom, leading to a hyperbolic spin-valley hall effect.

Authors:Tomer Eini, Tel Aviv University / Tal Asherov, Tel Aviv University / Yarden Mazor, Tel Aviv University / Itai Epstein, Tel Aviv University


6:00 - 6:15

(Withdrawn) Elastic and Inelastic Exciton Scattering in InGaAs Multi-Quantum Wells (FM1A.5)
Presenter: Daniel Anders, Justus-Liebig-University Giessen

Electron-exciton and exciton-exciton scattering in semiconductor quantum wells are studied by ultrafast optical-pump terahertz-probe spectroscopy. Elastic and inelastic contributions to the scattering processes are derived from analyzing the experimentally observed intraexcitonic linewidth and oscillator strength.

Authors:Daniel Anders, Justus-Liebig-University Giessen / Markus Stein, Justus-Liebig-University Giessen / Sangam Chatterjee, Justus-Liebig-University Giessen

6:15 - 6:30

(Withdrawn) Helical Phonon Signatures of a-Axis MnBi2Te4 Septuple Magnetic Topological Insulators Near the Néel Temperature (FM1A.6)
Presenter: Jin ho Kang, UCLA

Raman spectroscopy reveals rotation of anisotropy pattern in phonon vibration mode of A-axis MnBi2Te4 samples near Néel temperature and helical phonon behavior under different crosscircular polarization configurations, specifically right-left and left-right.

Authors:Jin ho Kang, UCLA / Yujin cho, UCLA / Liangbo Liang, ORNL / chaowei hu, UCLA / Madeline Tayor, UCLA / Alexander Puretzky, ORNL / Ni Ni, UCLA / Chee Wei Wong, UCLA

6:30 - 6:45

Probing Ultrafast Dynamics of Anharmonically Coupled Phonons in Few-Layer Hexagonal Boron Nitride (FM1A.7)
Presenter: Taehee Kang, Max Born Institute

Nonequilibrium dynamics of transverse optical (TO) phonons in few-layer hexagonal boron nitride is studied in mid-infrared pump-probe experiments. TO phonons display a 1.2 ps lifetime and a transient redshift due to anharmonic coupling with lowfrequency interlayer modes.

Authors:Taehee Kang, Max Born Institute / Jia Zhang, Max Born Institute / Achintya Kundu, Max Born Institute / Klaus Reimann, Max Born Institute / Michael Woerner, Max Born Institute / Thomas Elsaesser, Max Born Institute / Bernard Gil, Laboratoire Charles Coulomb / Guillaume Cassabois, Laboratoire Charles Coulomb / Christos Flytzanis, Laboratoire de Physique / Giorgia Fugallo, CNRS / Michele Lazzeri, Sorbonne University / Ryan Page, Cornell University / Debdeep Jena, Cornell University


6:45 - 7:00

Coherent Contributions to Population Dynamics in a Semiconductor Microcavity (FM1A.8)
Presenter: Jared Wahlstrand, NIST

Ultrafast exciton-polariton dynamics are investigated using optical multidimensional coherent spectroscopy. A Bloch equations simulation including Pauli blocking and the Coulomb interaction between excitons is found to give good agreement with measured spectra.

Authors:Jagannath Paul, West Virginia University / Hendrik Rose, Paderborn University / Ethan Swagel, Brown University / Torsten Meier, Paderborn University / Jared Wahlstrand, NIST / Alan Bristow, West Virginia University