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3 results on '"Lukas Schwarz"'

1. Fano interference between collective modes in cuprate high-T c superconductors

Author

Hao Chu, Sergey Kovalev, Zi Xiao Wang, Lukas Schwarz, Tao Dong, Liwen Feng, Rafael Haenel, Min-Jae Kim, Parmida Shabestari, Le Phuong Hoang, Kedar Honasoge, Robert David Dawson, Daniel Putzky, Gideok Kim, Matteo Puviani, Min Chen, Nilesh Awari, Alexey N. Ponomaryov, Igor Ilyakov, Martin Bluschke, Fabio Boschini, Marta Zonno, Sergey Zhdanovich, Mengxing Na, Georg Christiani, Gennady Logvenov, David J. Jones, Andrea Damascelli, Matteo Minola, Bernhard Keimer, Dirk Manske, Nanlin Wang, Jan-Christoph Deinert, and Stefan Kaiser

Subjects
Science
Abstract

Cuprate superconductors are known for their intertwined interactions and coexistence of competing orders. Here, the authors observe a Fano resonance in the nonlinear THz response of La2-xSrxCuO4, which may arise from a coupling between superconducting and charge-density-wave amplitude fluctuations.

Published
2023
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2. Phase-resolved Higgs response in superconducting cuprates

Author

Hao Chu, Min-Jae Kim, Kota Katsumi, Sergey Kovalev, Robert David Dawson, Lukas Schwarz, Naotaka Yoshikawa, Gideok Kim, Daniel Putzky, Zhi Zhong Li, Hélène Raffy, Semyon Germanskiy, Jan-Christoph Deinert, Nilesh Awari, Igor Ilyakov, Bertram Green, Min Chen, Mohammed Bawatna, Georg Cristiani, Gennady Logvenov, Yann Gallais, Alexander V. Boris, Bernhard Keimer, Andreas P. Schnyder, Dirk Manske, Michael Gensch, Zhe Wang, Ryo Shimano, and Stefan Kaiser

Subjects
Science
Abstract

Interaction between Cooper pairs and other collective excitations may reveal important information about the pairing mechanism. Here, the authors observe a universal jump in the phase of the driven Higgs oscillations in cuprate thin films, indicating the presence of a coupled collective mode, as well as a nonvanishing Higgs-like response at high temperatures, suggesting a potential nonzero pairing amplitude above Tc.

Published
2020
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3. Classification and characterization of nonequilibrium Higgs modes in unconventional superconductors

Author

Götz S. Uhrig, Nathan Cheng, Benedikt Fauseweh, Nikolaj Bittner, Dirk Manske, Andreas P. Schnyder, Lukas Schwarz, H. Krull, Stefan Kaiser, Mona Berciu, and Naoto Tsuji

Subjects
High Energy Physics::Lattice, Science, FOS: Physical sciences, General Physics and Astronomy, 02 engineering and technology, 01 natural sciences, General Biochemistry, Genetics and Molecular Biology, Article, Superconducting properties and materials, Superconductivity (cond-mat.supr-con), Theoretical physics, Condensed Matter - Strongly Correlated Electrons, Condensed Matter::Superconductivity, 0103 physical sciences, 010306 general physics, Quantum, Superconductivity, Physics, Multidisciplinary, Strongly Correlated Electrons (cond-mat.str-el), Oscillation, Condensed Matter - Superconductivity, Momentum transfer, High Energy Physics::Phenomenology, General Chemistry, 021001 nanoscience & nanotechnology, Symmetry (physics), Higgs boson, 0210 nano-technology, Ground state, Group theory
Abstract

Recent findings of new Higgs modes in unconventional superconductors require a classification and characterization of the modes allowed by nontrivial gap symmetry. Here we develop a theory for a tailored nonequilibrium quantum quench to excite all possible oscillation symmetries of a superconducting condensate. We show that both a finite momentum transfer and quench symmetry allow for an identification of the resulting Higgs oscillations. These serve as a fingerprint for the ground state gap symmetry. We provide a classification scheme of these oscillations and the quench symmetry based on group theory for the underlying lattice point group. For characterization, analytic calculations as well as full scale numeric simulations of the transient optical response resulting from an excitation by a realistic laser pulse are performed. Our classification of Higgs oscillations allows us to distinguish between different symmetries of the superconducting condensate., 12+6 pages

Published
2020

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