Cubero Gómez, DavidRobb, Gordon R. M.Renzoni, Ferruccio2020-06-292020-06-292018Cubero Gómez, D., Robb, G.R.M. y Renzoni, F. (2018). Avoided Crossing and sub-Fourier-sensitivity in Driven Quantum Systems. Physical Review Letters, 121 (21), 213904-.0031-90071079-7114https://hdl.handle.net/11441/98393The response of a linear system to an external perturbation is governed by the Fourier limit, with the inverse of the interaction time constituting a lower limit for the system bandwidth. This does not hold for nonlinear systems, which can thus exhibit sub-Fourier-behavior. The present Letter identifies a mechanism for sub-Fourier-sensitivity in driven quantum systems, which relies on avoided crossing between Floquet states. Features up to three orders of magnitude finer than the Fourier limit are presented.application/pdf5 p.engAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccesshttps://doi.org/10.1103/PhysRevLett.121.213904