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Continuity of the Lyapunov exponent for quasiperiodic operators with analytic potential

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arxiv math-ph/0110040 v1 pith:2CD7MQFJ submitted 2001-10-31 math-ph math.DSmath.MP

classification math-phmath.DSmath.MP
keywords frequencyanalyticexponentlyapunovoperatorspotentialquasiperiodicassumptions
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We study regularity properties of the Lyapunov exponent L of quasiperiodic operators with analytic potential, under no assumptions on the Diophantine class of the frequency. We prove that L is jointly continuous, in frequency and energy, at every irrational frequency.

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Cited by 2 Pith papers

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  1. Observation of Metal-Insulator and Spectral Phase Transitions in Aubry-Andr\'e-Harper Models

    quant-ph 2025-08 conditional novelty 6.0 of 10

    A single-photon quantum-walk experiment realizes the unitary almost-Mathieu operator and observes metal-insulator, parity-time symmetry-breaking, and all-imaginary-quasienergy spectral transitions.

  2. Phase Transitions in Quasi-Periodically Driven Quantum Critical Systems: Analytical Results

    cond-mat.stat-mech 2025-01 conditional novelty 6.0 of 10

    Quasiperiodically varying the driving Hamiltonian in a 1D conformal field theory produces analytically solvable heating and non-heating phases, with an exact phase transition line.

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