Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session A50: High Harmonic Generation of Strongly Correlated Quantum MaterialsInvited Live
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Sponsoring Units: DCMP Chair: Jian-Xin Zhu, Los Alamos Natl Lab |
Monday, March 15, 2021 8:00AM - 8:36AM Live |
A50.00001: High harmonic generation in Mott Insulators: Insights from dynamical mean field theory Invited Speaker: Martin Eckstein Ultra-strong fields can drive highly nonlinear electron dynamics in the |
Monday, March 15, 2021 8:36AM - 9:12AM Live |
A50.00002: High harmonic generation driven by mid-infrared lasers Invited Speaker: Zenghu Chang In recent years, high-power ultrafast lasers centered at 1.7 to 2.5 micron have enabled the generation of attosecond X-ray pulses reaching the water window (282 to 533 eV), which is of great interest given their applications in the study of electron dynamics in atoms, molecules and condensed matter containing carbon, nitrogen, oxygen and other important elements [1]. X-ray pulses as short as 53 attoseconds have been demonstrated at the carbon K-edge. Novel spectral phase retrieval schemes such as neural network have been implemented to attosecond streaking techniques for faster and more reliable characterization of X-ray pulses. The water window X-ray sources have been applied to attosecond transient absorption spectroscopy with element specificity and sub-optical-cycle temporal resolution [2]. |
Monday, March 15, 2021 9:12AM - 9:48AM Live |
A50.00003: Sumio Ishihara Invited Talk Invited Speaker: Sumio Ishihara TBD |
Monday, March 15, 2021 9:48AM - 10:24AM Live |
A50.00004: Anomalous symmetry breaking in an insulating cuprate Invited Speaker: David Hsieh The phase diagram of the cuprates features many exotic states at finite doping including the pseudogap, strange metal and high-Tc superconducting states. However, it is generally believed that the un-doped parent system is a well understood Mott insulator, whose low energy physics is fully captured by a two-dimensional spin-1/2 antiferromagnetic Heisenberg model. In this talk, I will discuss recent optical second harmonic generation results on a model insulating cuprate Sr2CuO2Cl2, which show evidence of anomalous broken symmetries suggesting physics beyond these simple models. |
Monday, March 15, 2021 10:24AM - 11:00AM Live |
A50.00005: High harmonic generation in heavy fermion systems Invited Speaker: Benedikt Fauseweh Since the first high harmonic generation (HHG) in crystalline solids in 2011 [1], it quickly became apparent, that the mechanism leading to HHG in solids can be used to explore the electron and lattice dynamics on ultrafast time scales. On the theoretical side the focus was initially on weakly correlated and effective single band systems. In strongly correlated systems, e.g. with localized and partially occupied orbitals, this picture can break down, as the photoinduced dynamics can induce significant changes to the electronic and structural order [2]. In this talk, we examine the nonequilibrium dynamics in a prototypical class of strongly correlated materials: heavy fermion systems. Specifically, we study laser pulse driven Kondo systems within a charge ordered regime [3] and close to criticality [4]. The HHG spectra, which can be observed in the current emission spectroscopy, strongly depend on the strength of the laser field, filling factor and the Kondo energy scale. By comparing the dynamics to time-dependent spectral functions, structure factors and local spin correlations the change of the harmonic structures are traced back to a breakdown of the Kondo insulator and a laser induced phase transition to a conductor. We propose, that HHG spectra can serve as an experimental indicator to identify the different dynamical regimes induced by the laser pulses. |
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