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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Untethered microbot powered by giant magnetoelastic strain

Posted by klaurent Harvard

Kavli Affiliate: Zhigang Suo | First 5 Authors: Yukun Xia, Jikun Wang, Ruisen Yang, Tongqing Lu, Tiejun Wang | Summary: Magnetic elastomers deform under a magnetic field, working as a soft actuator. Untethered microbot made of magnetic elastomers have great potentials in performing medical tasks inside human body as mini doctors. However, the lack of […]


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HAWC+/SOFIA Multiwavelength Polarimetric Observations of OMC-1

Posted by klaurent Stanford

Kavli Affiliate: Rodriguez Enrique Lopez | Summary:We report new polarimetric and photometric maps of the massive star-forming region OMC-1 using the HAWC+ instrument on the Stratospheric Observatory for Infrared Astronomy (SOFIA). We present continuum polarimetric and photometric measurements of this region at 53, 89, 154, and 214 microns at angular resolutions of 5.1, 7.9, 14.0, […]


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Robust Model Predictive Control of Irrigation Systems with Active Uncertainty Learning and Data Analytics

Posted by klaurent Cornell

Kavli Affiliate: Abraham Stroock | Summary:We develop a novel data-driven robust model predictive control (DDRMPC) approach for automatic control of irrigation systems. The fundamental idea is to integrate both mechanistic models, which describe dynamics in soil moisture variations, and data-driven models, which characterize uncertainty in forecast errors of evapotranspiration and precipitation, into a holistic systems […]


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Robust Model Predictive Control of Irrigation Systems with Active Uncertainty Learning and Data Analytics

Posted by klaurent Cornell

Kavli Affiliate: Abraham Duncan Stroock | First 5 Authors: Chao Shang, Wei-Han Chen, Abraham Duncan Stroock, Fengqi You, | Summary: We develop a novel data-driven robust model predictive control (DDRMPC) approach for automatic control of irrigation systems. The fundamental idea is to integrate both mechanistic models, which describe dynamics in soil moisture variations, and data-driven […]


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Gravitationally lensed quasars in Gaia: III. 22 new lensed quasars from Gaia Data Release 2

Posted by klaurent Cambridge

Kavli Affiliate: R. G. McMahon | Summary:We report the discovery and spectroscopic confirmation of 22 new gravitationally lensed quasars found using $textitGaia$ data release 2. The selection was made using several techniques: multiple $textitGaia$ detections around objects in quasar candidate catalogues, modelling of unWISE coadd pixels using $textitGaia$ astrometry, and $textitGaia$ detections offset from photometric […]


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Towards geometric Satake correspondence for Kac-Moody algebras — Cherkis bow varieties and affine Lie algebras of type $A$

Posted by klaurent Tokyo

Kavli Affiliate: Hiraku Nakajima | Summary:We give a provisional construction of the Kac-Moody Lie algebra module structure on the hyperbolic restriction of the intersection cohomology complex of the Coulomb branch of a framed quiver gauge theory, as a refinement of the conjectural geometric Satake correspondence for Kac-Moody algebras proposed in an earlier paper with Braverman, […]


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Disentangling lattice and electronic contributions to the metal-insulator transition from bulk vs. layer confined RNiO$_3$

Posted by klaurent Cornell

Kavli Affiliate: Ankit Disa | Summary:In complex oxide materials, changes in electronic properties are often associated with changes in crystal structure, raising the question of the relative roles of the electronic and lattice effects in driving the metal-insulator transition. This paper presents a combined theoretical and experimental analysis of the dependence of the metal-insulator transition […]


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Disentangling lattice and electronic contributions to the metal-insulator transition from bulk vs. layer confined RNiO$_3$

Posted by Cornell

Kavli Affiliate: Ankit Disa | First 5 Authors: Alexandru B. Georgescu, Oleg E. Peil, Ankit Disa, Antoine Georges, Andrew J. Millis | Summary: In complex oxide materials, changes in electronic properties are often associated with changes in crystal structure, raising the question of the relative roles of the electronic and lattice effects in driving the […]


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Diffraction limited centimeter scale radiator: metasurface grating antenna for phased array LiDAR

Posted by klaurent UCSB

Kavli Affiliate: Larry Coldren | Summary:In this paper, we demonstrate a radiation-strength-chirped metasurface centimeter-long grating antenna, whose beam quality is approaching the diffraction limit in its footprint with 90 percent efficiency.Instead of chirping the duty cycle to tune radiation strength, which calls for non-scalable fabrication resolution, we design a 2D fish-bone surface grating with apodized […]


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