Publications by authors named "Fucong Chen"
Disorder is ubiquitous in real materials and can have dramatic effects on quantum phase transitions. Originating from the disorder enhanced quantum fluctuation, quantum Griffiths singularity (QGS) has been revealed as a universal phenomenon in quantum criticality of low-dimensional superconductors. However, due to the weak fluctuation effect, QGS is very challenging to detect experimentally in three-dimensional (3D) superconducting systems.
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- The research focuses on nonlinear terahertz third-harmonic generation (THG) in YBaCuO thin films, revealing that the THG signal appears even in the normal state, contrasting with traditional superconductors.
- The THG signal displays an anomaly just below the optimal doping temperature, and a unique beat pattern is observed in the real-time waveform of the THG signal.
- The study suggests that the Higgs mode, which emerges at lower temperatures, influences energy level splitting via a coupling mechanism, although this effect is less noticeable in underdoped samples, providing insights into superconductivity and the pseudogap phenomenon.