Numerical evolution of the BBH model with controlled gain shows stable lasing modes are set by topological corner and edge states, with new ratios τ1, τ2, and χ that jump at phase transitions when the hopping ratio γ/λ is varied.
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Quasi-periodic driving of a four-level system creates temporal analogs of quantum spin Hall and higher-order topological insulators, yielding quantized energy exchange rates between drives due to synthetic edge or corner modes.
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Nonlinear topological laser based on multipole insulators
Numerical evolution of the BBH model with controlled gain shows stable lasing modes are set by topological corner and edge states, with new ratios τ1, τ2, and χ that jump at phase transitions when the hopping ratio γ/λ is varied.
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Topological energy pumping in a quasi-periodically driven four-level system
Quasi-periodic driving of a four-level system creates temporal analogs of quantum spin Hall and higher-order topological insulators, yielding quantized energy exchange rates between drives due to synthetic edge or corner modes.