The spontaneous symmetry breaking in Ta ₂ NiSe ₅ is structural in nature

Proceedings of the National Academy of Sciences · 2023 · 58 citations

• Physics
• Mathematics
• Quantum mechanics

is mostly of structural character, hampering the possibility to realize quasi-dissipationless energy transport.

Exciton-driven antiferromagnetic metal in a correlated van der Waals insulator

Nature Communications · 2021 · 88 citations

• Condensed matter physics
• Physics
• Quantum mechanics

Spontaneous gyrotropic electronic order in a transition-metal dichalcogenide

Nature · 2020 · 129 citations

• Condensed matter physics
• Physics
• Quantum mechanics

Self-similar dynamics of order parameter fluctuations in pump-probe experiments

Physical review. B./Physical review. B · 2020 · 48 citations

• Statistical physics
• Physics
• Economics

Upon excitation by a laser pulse, broken-symmetry phases of a wide variety of solids demonstrate similar order parameter dynamics characterized by a dramatic slowing down of relaxation for stronger pump fluences. Motivated by this recurrent phenomenology, we develop a simple nonperturbative effective model for photoinduced dynamics of collective bosonic excitations. We find that as the system recovers after photoexcitation, it shows universal prethermalized dynamics manifesting a power-law, as opposed to exponential, relaxation, explaining the slowing down of the recovery process. For strong quenches, long-wavelength overpopulated transverse modes dominate the long-time dynamics; their distribution function exhibits universal scaling in time and space, whose universal exponents can be computed analytically. Our model offers a unifying description of order parameter fluctuations in a regime far from equilibrium, and our predictions can be tested with available time-resolved techniques.