Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 3: Superconductivity: Properties and Electronic Structure
TT 3.5: Vortrag
Montag, 27. März 2023, 10:30–10:45, HSZ 103
Higgs-CDW hybrid mode in coherently-driven 2H-NbSe2 and La2−xSrxCuO4 — •Liwen Feng1,2,3,4, Jiayuan Cao2, Tim Priessnitz1, Gennady Logvenov1, Bernhard Keimer1, Yuan Huang7, Jan-Christoph Deinert5, Sergey Kovalev5, Tao Dong6, Stefan Kaiser1,3,4, and Hao Chu1,2 — 1Max Planck Institute for Solid State Research, Stuttgart, Germany — 2Shanghai Jiaotong University, Shanghai, China — 3University of Stuttgart, Stuttgart, Germany — 4Technical University Dresden, Dresden, Germany — 5Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 6Peking University, Beijing, China — 7Beijing Institute of Technology, Beijing, China
Superconductivity and a charge-density-wave (CDW) are often found as close neighbors in the thermodynamic phase diagram of many materials at low temperatures. A prototypical system showing the co-existence of the two orders is 2H-NbSe2. Here, we coherently drive collective oscillations by terahertz radiation and report on third harmonic generation (THG) from both CDW amplitude oscillations and Higgs oscillations. We find the interaction between two orders leads to a Fano interference of THG signals, which displays as an out-of-phase interference in the time-domain. This we characterize as Higgs-CDW hybrid that can be controlled by the THz driving field. Additionally, a similar phenomenon manifestes in the underdoped cuprate La2−xSrxCuO4 (x∼0.12) under non-perturbative drive. As such non-linear THz drives of order parameter oscillations opening up possibilities of investigating intertwined orders in the future.