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Hybridization Dynamics in CeCoIn_{5} Revealed by Ultrafast Optical Spectroscopy
Y P Liu1,2, Y J Zhang3, J J Dong4,5
1State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 611731, China.
Physical Review Letters
|February 22, 2020
Summary
Heavy fermion CeCoIn_{5} exhibits hybridization fluctuations before heavy electron coherence. Anomalous phonon behavior below T* signals collective hybridization, potentially revealing an unconventional density wave.
Area of Science:
- Condensed matter physics
- Quantum materials science
Background:
- Heavy fermion systems, like CeCoIn_{5}, are crucial for understanding electron correlations.
- Probing quasiparticle dynamics is key to uncovering emergent phenomena in these materials.
Purpose of the Study:
- Investigate quasiparticle dynamics in CeCoIn_{5} using ultrafast spectroscopy.
- Clarify the role of hybridization fluctuations and collective phenomena.
Main Methods:
- Ultrafast optical pump-probe spectroscopy.
- Temperature-dependent measurements from ~120 K down to ~55 K.
Main Results:
- Observed hybridization fluctuations preceding heavy electron coherence as temperature decreases.
- Identified anomalous coherent phonon softening and damping reduction below T* linked to collective hybridization.
- Discovered a distinct ~8 meV collective mode, possibly indicating an unconventional density wave.
Conclusions:
- CeCoIn_{5} exhibits distinct phases related to hybridization dynamics.
- The findings offer insights into the emergence of collective phenomena in heavy fermion materials.
- The observed collective mode may be evidence for predicted unconventional density waves.
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