The role of effective mass and long-range interactions in the band-gap renormalization of photo-excited semiconductors

Posted by klaurent Caltech

Kavli Affiliate: Scott K. Cushing | Summary:Understanding how to control changes in electronic structure and related dynamical renormalizations by external driving fields is the key for understanding ultrafast spectroscopy and applications in electronics. Here we focus on the band-gap’s modulation by external electric fields and uncover the effect of band dispersion on the gap renormalization. […]


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Hints of Primordial Magnetic Fields at Recombination and Implications for the Hubble Tension

Posted by klaurent Stanford

Kavli Affiliate: Tom Abel | Summary:Primordial Magnetic Fields (PMFs), long studied as relics of the early Universe, accelerate recombination and have been proposed as a way to relieve the Hubble tension. However, previous studies relied on simplified toy models. Here we use recent evaluations of recombination with PMFs, incorporating full magnetohydrodynamic (MHD) simulations and detailed […]


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Optimal sensing on an asymmetric exceptional surface

Posted by klaurent Berkeley

Kavli Affiliate: Birgitta Whaley | Summary:We study the connection between exceptional points (EPs) and optimal parameter estimation, in a simple system consisting of two counter-propagating traveling wave modes in a microring resonator. The unknown parameter to be estimated is the strength of a perturbing cross-coupling between the two modes. Partially reflecting the output of one […]


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