Vernier spectrometer using counter-propagating soliton microcombs

Posted by klaurent Caltech

Kavli Affiliate: Amnon Yariv | Summary:Acquisition of laser frequency with high resolution under continuous and abrupt tuning conditions is important for sensing, spectroscopy and communications. Here, a single microresonator provides rapid and broad-band measurement of frequencies across the optical C-band with a relative frequency precision comparable to conventional dual frequency comb systems. Dual-locked counter-propagating solitons […]


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Candidate Massive Galaxies at $z sim 4$ in the Dark Energy Survey

Posted by klaurent Stanford

Kavli Affiliate: Rafe Schindler | Summary:Using stellar population models, we predicted that the Dark Energy Survey (DES) – due to its special combination of area (5000 deg. sq.) and depth ($i = 24.3$) – would be in the position to detect massive ($gtrsim 10^11$ M$_odot$) galaxies at $z sim 4$. We confront those theoretical calculations […]


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Astrometry and Occultation predictions to Trans-Neptunian and Centaur Objects observed within the Dark Energy Survey

Posted by klaurent Chicago

Kavli Affiliate: Alex Drlica Wagner | Summary:Transneptunian objects (TNOs) are a source of invaluable information to access the history and evolution of the outer solar system. However, observing these faint objects is a difficult task. As a consequence, important properties such as size and albedo are known for only a small fraction of them. Now, […]


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On the Neutrino Flares from the Direction of TXS 0506+056

Posted by klaurent Chicago

Kavli Affiliate: Scott P. Wakely | Summary:For the first time since the discovery of high-energy cosmic neutrinos by IceCube, a multimessenger campaign identified a distant gamma ray blazar, TXS 0506+056, as the source of a high-energy neutrino. The extraordinary brightness of the blazar despite its distance suggests that it may belong to a special class […]


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Gelfand-Fuchs cohomology in algebraic geometry and factorization algebras

Posted by klaurent Tokyo

Kavli Affiliate: Mikhail Kapranov | Summary:Let X be a smooth affine variety over a field k of characteristic 0 and T(X) be the Lie algebra of regular vector fields on X. We compute the Lie algebra cohomology of T(X) with coefficients in k. The answer is given in topological terms relative to any embedding of […]


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Realization of the degenerate parametric oscillator in electromechanical systems

Posted by klaurent Delft

Kavli Affiliate: Ya Blanter | Summary:We consider an electromechanical system where a microwave cavity is coupled to a mechanical resonator, with a mechanical frequency twice the microwave frequency. In this regime, the effective photon-phonon interaction is equivalent to that of a degenerate parametric amplifier, instead of the typical radiation pressure interaction. If the mechanical resonator […]


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Suppressing Diffusion-Mediated Exciton Annihilation in 2D Semiconductors Using the Dielectric Environment

Posted by klaurent Berkeley

Kavli Affiliate: Ali Javey | Summary:Atomically thin semiconductors such as monolayer MoS2 and WS2 exhibit nonlinear exciton-exciton annihilation at notably low excitation densities (below ~10 excitons/um2 in MoS2). Here, we show that the density threshold at which annihilation occurs can be tuned by changing the underlying substrate. When the supporting substrate is changed from SiO2 […]


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