Introduces a universal dimensionless instability parameter based on quantum-state evolution speed versus spectral-gap protection, plus a self-limitation theorem for nonlinear regulators in driven quantum systems.
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Quantum geometric semimetals produce instantaneous steady-state current under electric fields via interband coupling from Hilbert-Schmidt quantum distance and finite density of states at band-touching points, outperforming metals, semiconductors, and graphene in switching speed.
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Ultrafast Current Switching from Quantum Geometry in Semimetals
Quantum geometric semimetals produce instantaneous steady-state current under electric fields via interband coupling from Hilbert-Schmidt quantum distance and finite density of states at band-touching points, outperforming metals, semiconductors, and graphene in switching speed.