Dynamical decoding of the competition between charge density waves in a kagome superconductor

Honglie Ning, Kyoung Hun Oh, Yifan Su, Alexander Hoegen, Zach Porter, Andrea Capa Salinas, Quynh L. Nguyen, Matthieu Chollet, Takahiro Sato, Vincent Esposito, Matthias C. Hoffmann, Adam White, Cynthia Melendrez, Diling Zhu, Stephen D. Wilson and Nuh Gedik ()
Additional contact information
Honglie Ning: Massachusetts Institute of Technology
Kyoung Hun Oh: Massachusetts Institute of Technology
Yifan Su: Massachusetts Institute of Technology
Alexander Hoegen: Massachusetts Institute of Technology
Zach Porter: SLAC National Accelerator Laboratory
Andrea Capa Salinas: University of California
Quynh L. Nguyen: SLAC National Accelerator Laboratory
Matthieu Chollet: SLAC National Accelerator Laboratory
Takahiro Sato: SLAC National Accelerator Laboratory
Vincent Esposito: SLAC National Accelerator Laboratory
Matthias C. Hoffmann: SLAC National Accelerator Laboratory
Adam White: SLAC National Accelerator Laboratory
Cynthia Melendrez: SLAC National Accelerator Laboratory
Diling Zhu: SLAC National Accelerator Laboratory
Stephen D. Wilson: University of California
Nuh Gedik: Massachusetts Institute of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract The kagome superconductor CsV3Sb5 hosts a variety of charge density wave (CDW) phases, which play a fundamental role in the formation of other exotic electronic instabilities. However, identifying the precise structure of these CDW phases and their intricate relationships remain the subject of intense debate, due to the lack of static probes that can distinguish the CDW phases with identical spatial periodicity. Here, we unveil the out-of-equilibrium competition between two coexisting 2 × 2 × 2 CDWs in CsV3Sb5 harnessing time-resolved X-ray diffraction. By analyzing the light-induced changes in the intensity of CDW superlattice peaks, we demonstrate the presence of both phases, each displaying a significantly different amount of melting upon excitation. The anomalous light-induced sharpening of peak width further shows that the phase that is more resistant to photo-excitation exhibits an increase in domain size at the expense of the other, thereby showcasing a hallmark of phase competition. Our results not only shed light on the interplay between the multiple CDW phases in CsV3Sb5, but also establish a non-equilibrium framework for comprehending complex phase relationships that are challenging to disentangle using static techniques.

Date: 2024
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DOI: 10.1038/s41467-024-51485-5

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