The cascade of resonant PT-symmetric topological structures is shown to emit laser light with a frequency comb spectrum. We consider optically active topological lattices supporting edge modes at regularly spaced frequencies. When the amplified resonances in the PT-broken regime match the edge modes of the topological gratings, we predict the emission of discrete laser lines. A proper design enables the engineering of the spectral features for specific applications.… Read the rest
Archive for month: December, 2017
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che ora sono reindirizzati al sito principale isc.… Read the rest
Massimo Cencini has published Energetic funnel facilitates facilitated diffusion in Nucleic Acid Research.
Gene transcription is regulated by proteins – Transcription Factors (TFs) – that by binding to short target sequences are able to promote or impede the binding of RNA-Polymerase (RNAP) and, consequently, activate or repress tran-
scription. Fast and accurate control of gene expression is crucial for many biological functions, and relies on the ability of TFs to rapidly find their transcription factor binding site (TFBS) among a multitude of competing DNA sequences,
and to establish with it a stable complex.… Read the rest