Journal
PHYSICAL REVIEW LETTERS
Volume 124, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.207003
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Funding
- National Science Foundation [EECS 1611454, 1905981]
- Department of Energy Office of Basic Energy Sciences [DE-FG02-06ER46327]
- Department of Energy [DESC100387-020]
- U.S. Department of Energy [DESC0019137]
- Alabama Supercomputer Authority
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1905981] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-FG02-06ER46327] Funding Source: U.S. Department of Energy (DOE)
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We report terahertz (THz) light-induced second harmonic generation, in superconductors with inversion symmetry that forbid even-order nonlinearities. The THz second harmonic emission vanishes above the superconductor critical temperature and arises from precession of twisted Anderson pseudospins at a multicycle, THz driving frequency that is not allowed by equilibrium symmetry. We explain the microscopic physics by a dynamical symmetry breaking principle at sub-THz-cycle by using quantum kinetic modeling of the interplay between strong THz-lightwave nonlinearity and pulse propagation. The resulting nonzero integrated pulse area inside the superconductor leads to light-induced nonlinear supercurrents due to subcycle Cooper pair acceleration, in contrast to dc-biased superconductors, which can be controlled by the band structure and THz driving field below the superconducting gap.
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