Hour: From 15:00h to 16:00h
Place: Seminar Room & Online
SEMINAR: Predicting and Controlling Nonequilibrium Quantum Matter Towards Scalable Quantum Information Science
In this talk, I will present a pedagogical introduction of theoretical and computational approaches to describe excited-states in quantum matter, and predicting emergent states created by external drives. Understanding the role of such light-matter interactions in the regime of correlated electronic systems is of paramount importance to fields of study across condensed matter physics and ultrafast dynamics1. The simultaneous contribution of processes that occur on many time and length-scales have remained elusive for state-of-the-art calculations and model Hamiltonian approaches alike, necessitating the development of new methods in computational physics. I will discuss our latest results at the intersection of ab initio cavity quantum-electrodynamics and electronic structure methods to treat electrons, photons and phonons on the same quantized footing, accessing new observables in strong light-matter coupling. Current approximations in the field almost exclusively focus on electronic excitations, neglecting electron-photon effects, for example, thereby limiting the applicability of conventional methods in the study of polaritonic systems, which requires understanding the coupled dynamics of electronic spins, nuclei, phonons and photons. With our approach we can access correlated electron-photon and photon-phonon dynamics2–7, essential to our latest work on driving quantum systems far out-of-equilibrium to control the coupled electronic and vibrational degrees-of-freedom 8–20. In the second part of my talk, I will demonstrate how the same approach can be generalized in the context of control of molecular quantum matter and quantum transduction. As a first example, I will discuss a cavity-mediated approach to break the inversion symmetry allowing for highly tunable even-order harmonic generation (e.g. second- and fourth-harmonic generation) naturally forbidden in such systems. This relies on a quantized treatment of the coupled light-matter system, similar to the driven case, where the molecular matter is confined within an electromagnetic environment and the incident (pump) field is treated as a quantized field in a coherent state. When the light-molecule system is strongly coupled, it leads to two important features: (i) a controllable strong-coupling-induced symmetry breaking, and (ii) a tunable and highly efficient nonlinear conversion efficiency of the harmonic generation processes 21–23. Both of these have implications for molecular quantum architectures. Being able to control molecules at a quantum level gives us access to degrees of freedom such as the vibrational or rotational degrees to the internal state structure. Finally, I will give an outlook on connecting ideas in cavity control of matter with quantum information science.
Biosketch Dr. Prineha Narang is a Professor in Physical Sciences at the University of California, Los Angeles (UCLA) where she holds the Howard Reiss Chair. Prior to moving, she was an Assistant Professor of Computational Materials Science at Harvard University. Before starting on the Harvard faculty in 2017, Dr. Narang was an Environmental Fellow at HUCE, and worked as a research scholar in condensed matter theory in the Department of Physics at MIT. She received an M.S. and Ph.D. in Applied Physics from Caltech. Her group works on theoretical and computational quantum materials, non-equilibrium dynamics, and transport in quantum matter. In 2023 she was appointed a U.S. Science Envoy by the State Department. Narang’s work has been recognized by many awards and special designations, including the 2023 Guggenheim Fellowship in Physics, a Maria Goeppert Mayer Award from the American Physical Society, 2022 Outstanding Early Career Investigator Award from the Materials Research Society, Mildred Dresselhaus Prize, Bessel Research Award from the Alexander von Humboldt Foundation, a Max Planck Award from the Max Planck Society, and the IUPAP Young Scientist Prize in Computational Physics all in 2021, an NSF CAREER Award in 2020, being named a Moore Inventor Fellow by the Gordon and Betty Moore Foundation, CIFAR Azrieli Global Scholar by the Canadian Institute for Advanced Research, and a Top Innovator by MIT Tech Review (MIT TR35). Narang has organized several symposia and workshops, most recently at the APS March Meeting on “Materials for Quantum Information Science”. Her continued service to the community includes chairing the Materials Research Society (MRS) Spring Meeting (2022) and the MRS-Kavli Foundation Future of Materials Workshop: Computational Materials Science (2021), as an Associate Editor at ACS Nano of the American Chemical Society, an Associate Editor at Applied Physics Letters of the American Institute of Physics, organizing APS, Optica (OSA), and SPIE symposia, and a leadership role in APS’ Division of Materials Physics. Outside of science, she is an avid triathlete, runner, and starting her mountaineering journey.
References
- Head-Marsden, K., Flick, J., Ciccarino, C. J. & Narang, P. Quantum Information and Algorithms for Correlated Quantum Matter. Chem. Rev. 121, 3061–3120 (2021).
- Rivera, N., Flick, J. & Narang, P. Variational Theory of Nonrelativistic Quantum Electrodynamics. Phys. Rev. Lett. 122, 193603 (2019).
- Flick, J., Rivera, N. & Narang, P. Strong light-matter coupling in quantum chemistry and quantum photonics. Nanophotonics 7, 1479–1501 (2018).
- Flick, J. & Narang, P. Cavity-Correlated Electron-Nuclear Dynamics from First Principles. Physical Review Letters vol. 121 (2018).
- Wang, D. S., Neuman, T., Flick, J. & Narang, P. Light-matter interaction of a molecule in a dissipative cavity from first principles. J. Chem. Phys. 154, 104109 (2021).
- Schäfer, C., Flick, J., Ronca, E., Narang, P. & Rubio, A. Shining Light on the Microscopic Resonant Mechanism Responsible for Cavity-Mediated Chemical Reactivity. Nat. Commun. (2022).
- Neuman, T., Wang, D. S. & Narang, P. Nanomagnonic Cavities for Strong Spin-Magnon Coupling and Magnon-Mediated Spin-Spin Interactions. Phys. Rev. Lett. 125, 247702 (2020).
- Juraschek, D. M., Meier, Q. N. & Narang, P. Parametric Excitation of an Optically Silent Goldstone-Like Phonon Mode. Physical Review Letters vol. 124 Preprint at https://doi.org/10.1103/physrevlett.124.117401 (2020).
- Juraschek, D. M., Narang, P. & Spaldin, N. A. Phono-magnetic analogs to opto-magnetic effects. Phys. Rev. Research 2, 043035 (2020).
- Juraschek, D. M., Neuman, T. & Narang, P. Giant effective magnetic fields from optically driven chiral phonons in 4f paramagnets. Phys. Rev. Research 4, 013129 (2022).
- Juraschek, D. M. & Narang, P. Magnetic control in the terahertz. Science vol. 374 1555–1556 (2021).
- Wang, Y. et al. Axial Higgs mode detected by quantum pathway interference in RTe3. Nature 606, 896–901 (2022).
- Disa, A. S. et al. Optical stabilization of fluctuating high temperature ferromagnetism in YTiO3. In Press at Nature.
- Zhang, Z. et al. Nonlinear coupled magnonics: Terahertz field-driven magnon upconversion. arXiv [cond-mat.mtrl-sci] (2022). Upcoming at Nature.
- Curtis, J. B. et al. Cavity magnon-polaritons in cuprate parent compounds. Phys. Rev. Research 4, (2022).
- Poniatowski, N. R., Curtis, J. B., Yacoby, A. & Narang, P. Spectroscopic signatures of time-reversal symmetry breaking superconductivity. Communications Physics 5, 1–11 (2022).
- Poniatowski, N. R. et al. Surface Cooper-Pair Spin Waves in Triplet Superconductors. Phys. Rev. Lett. 129, 237002 (2022).
- Klein, J. et al. Control of structure and spin texture in the van der Waals layered magnet CrSBr. Nat. Commun. 13, 5420 (2022).
- Klein, J. et al. Sensing the local magnetic environment through optically active defects in a layered magnetic semiconductor. ACS Nano 17, 288–299 (2023).
- Zhao, B., Guo, C., Garcia, C. A. C., Narang, P. & Fan, S. Axion-Field-Enabled Nonreciprocal Thermal Radiation in Weyl Semimetals. Nano Lett. 20, 1923–1927 (2020).
- Philbin, J. P. et al. Molecular van der Waals fluids in cavity quantum electrodynamics. arXiv [physics.chem-ph] (2022).
- Welakuh, D. M. & Narang, P. Transition from Lorentz to Fano Spectral Line Shapes in Nonrelativistic Quantum Electrodynamics. ACS Photonics 9, 2946–2955 (2022).
- Welakuh, D. M. & Narang, P. Tunable Nonlinearity and Efficient Harmonic Generation from a Strongly Coupled Light–Matter System. ACS Photonics Preprint at https://doi.org/10.1021/acsphotonics.2c00966 (2023).
Hour: From 15:00h to 16:00h
Place: Seminar Room & Online
SEMINAR: Predicting and Controlling Nonequilibrium Quantum Matter Towards Scalable Quantum Information Science
In this talk, I will present a pedagogical introduction of theoretical and computational approaches to describe excited-states in quantum matter, and predicting emergent states created by external drives. Understanding the role of such light-matter interactions in the regime of correlated electronic systems is of paramount importance to fields of study across condensed matter physics and ultrafast dynamics1. The simultaneous contribution of processes that occur on many time and length-scales have remained elusive for state-of-the-art calculations and model Hamiltonian approaches alike, necessitating the development of new methods in computational physics. I will discuss our latest results at the intersection of ab initio cavity quantum-electrodynamics and electronic structure methods to treat electrons, photons and phonons on the same quantized footing, accessing new observables in strong light-matter coupling. Current approximations in the field almost exclusively focus on electronic excitations, neglecting electron-photon effects, for example, thereby limiting the applicability of conventional methods in the study of polaritonic systems, which requires understanding the coupled dynamics of electronic spins, nuclei, phonons and photons. With our approach we can access correlated electron-photon and photon-phonon dynamics2–7, essential to our latest work on driving quantum systems far out-of-equilibrium to control the coupled electronic and vibrational degrees-of-freedom 8–20. In the second part of my talk, I will demonstrate how the same approach can be generalized in the context of control of molecular quantum matter and quantum transduction. As a first example, I will discuss a cavity-mediated approach to break the inversion symmetry allowing for highly tunable even-order harmonic generation (e.g. second- and fourth-harmonic generation) naturally forbidden in such systems. This relies on a quantized treatment of the coupled light-matter system, similar to the driven case, where the molecular matter is confined within an electromagnetic environment and the incident (pump) field is treated as a quantized field in a coherent state. When the light-molecule system is strongly coupled, it leads to two important features: (i) a controllable strong-coupling-induced symmetry breaking, and (ii) a tunable and highly efficient nonlinear conversion efficiency of the harmonic generation processes 21–23. Both of these have implications for molecular quantum architectures. Being able to control molecules at a quantum level gives us access to degrees of freedom such as the vibrational or rotational degrees to the internal state structure. Finally, I will give an outlook on connecting ideas in cavity control of matter with quantum information science.
Biosketch Dr. Prineha Narang is a Professor in Physical Sciences at the University of California, Los Angeles (UCLA) where she holds the Howard Reiss Chair. Prior to moving, she was an Assistant Professor of Computational Materials Science at Harvard University. Before starting on the Harvard faculty in 2017, Dr. Narang was an Environmental Fellow at HUCE, and worked as a research scholar in condensed matter theory in the Department of Physics at MIT. She received an M.S. and Ph.D. in Applied Physics from Caltech. Her group works on theoretical and computational quantum materials, non-equilibrium dynamics, and transport in quantum matter. In 2023 she was appointed a U.S. Science Envoy by the State Department. Narang’s work has been recognized by many awards and special designations, including the 2023 Guggenheim Fellowship in Physics, a Maria Goeppert Mayer Award from the American Physical Society, 2022 Outstanding Early Career Investigator Award from the Materials Research Society, Mildred Dresselhaus Prize, Bessel Research Award from the Alexander von Humboldt Foundation, a Max Planck Award from the Max Planck Society, and the IUPAP Young Scientist Prize in Computational Physics all in 2021, an NSF CAREER Award in 2020, being named a Moore Inventor Fellow by the Gordon and Betty Moore Foundation, CIFAR Azrieli Global Scholar by the Canadian Institute for Advanced Research, and a Top Innovator by MIT Tech Review (MIT TR35). Narang has organized several symposia and workshops, most recently at the APS March Meeting on “Materials for Quantum Information Science”. Her continued service to the community includes chairing the Materials Research Society (MRS) Spring Meeting (2022) and the MRS-Kavli Foundation Future of Materials Workshop: Computational Materials Science (2021), as an Associate Editor at ACS Nano of the American Chemical Society, an Associate Editor at Applied Physics Letters of the American Institute of Physics, organizing APS, Optica (OSA), and SPIE symposia, and a leadership role in APS’ Division of Materials Physics. Outside of science, she is an avid triathlete, runner, and starting her mountaineering journey.
References
- Head-Marsden, K., Flick, J., Ciccarino, C. J. & Narang, P. Quantum Information and Algorithms for Correlated Quantum Matter. Chem. Rev. 121, 3061–3120 (2021).
- Rivera, N., Flick, J. & Narang, P. Variational Theory of Nonrelativistic Quantum Electrodynamics. Phys. Rev. Lett. 122, 193603 (2019).
- Flick, J., Rivera, N. & Narang, P. Strong light-matter coupling in quantum chemistry and quantum photonics. Nanophotonics 7, 1479–1501 (2018).
- Flick, J. & Narang, P. Cavity-Correlated Electron-Nuclear Dynamics from First Principles. Physical Review Letters vol. 121 (2018).
- Wang, D. S., Neuman, T., Flick, J. & Narang, P. Light-matter interaction of a molecule in a dissipative cavity from first principles. J. Chem. Phys. 154, 104109 (2021).
- Schäfer, C., Flick, J., Ronca, E., Narang, P. & Rubio, A. Shining Light on the Microscopic Resonant Mechanism Responsible for Cavity-Mediated Chemical Reactivity. Nat. Commun. (2022).
- Neuman, T., Wang, D. S. & Narang, P. Nanomagnonic Cavities for Strong Spin-Magnon Coupling and Magnon-Mediated Spin-Spin Interactions. Phys. Rev. Lett. 125, 247702 (2020).
- Juraschek, D. M., Meier, Q. N. & Narang, P. Parametric Excitation of an Optically Silent Goldstone-Like Phonon Mode. Physical Review Letters vol. 124 Preprint at https://doi.org/10.1103/physrevlett.124.117401 (2020).
- Juraschek, D. M., Narang, P. & Spaldin, N. A. Phono-magnetic analogs to opto-magnetic effects. Phys. Rev. Research 2, 043035 (2020).
- Juraschek, D. M., Neuman, T. & Narang, P. Giant effective magnetic fields from optically driven chiral phonons in 4f paramagnets. Phys. Rev. Research 4, 013129 (2022).
- Juraschek, D. M. & Narang, P. Magnetic control in the terahertz. Science vol. 374 1555–1556 (2021).
- Wang, Y. et al. Axial Higgs mode detected by quantum pathway interference in RTe3. Nature 606, 896–901 (2022).
- Disa, A. S. et al. Optical stabilization of fluctuating high temperature ferromagnetism in YTiO3. In Press at Nature.
- Zhang, Z. et al. Nonlinear coupled magnonics: Terahertz field-driven magnon upconversion. arXiv [cond-mat.mtrl-sci] (2022). Upcoming at Nature.
- Curtis, J. B. et al. Cavity magnon-polaritons in cuprate parent compounds. Phys. Rev. Research 4, (2022).
- Poniatowski, N. R., Curtis, J. B., Yacoby, A. & Narang, P. Spectroscopic signatures of time-reversal symmetry breaking superconductivity. Communications Physics 5, 1–11 (2022).
- Poniatowski, N. R. et al. Surface Cooper-Pair Spin Waves in Triplet Superconductors. Phys. Rev. Lett. 129, 237002 (2022).
- Klein, J. et al. Control of structure and spin texture in the van der Waals layered magnet CrSBr. Nat. Commun. 13, 5420 (2022).
- Klein, J. et al. Sensing the local magnetic environment through optically active defects in a layered magnetic semiconductor. ACS Nano 17, 288–299 (2023).
- Zhao, B., Guo, C., Garcia, C. A. C., Narang, P. & Fan, S. Axion-Field-Enabled Nonreciprocal Thermal Radiation in Weyl Semimetals. Nano Lett. 20, 1923–1927 (2020).
- Philbin, J. P. et al. Molecular van der Waals fluids in cavity quantum electrodynamics. arXiv [physics.chem-ph] (2022).
- Welakuh, D. M. & Narang, P. Transition from Lorentz to Fano Spectral Line Shapes in Nonrelativistic Quantum Electrodynamics. ACS Photonics 9, 2946–2955 (2022).
- Welakuh, D. M. & Narang, P. Tunable Nonlinearity and Efficient Harmonic Generation from a Strongly Coupled Light–Matter System. ACS Photonics Preprint at https://doi.org/10.1021/acsphotonics.2c00966 (2023).