Direct growth of mm-size twisted bilayer graphene by plasma-enhanced chemical vapor deposition

Posted by klaurent Caltech

Kavli Affiliate: N. C. Yeh |Summary:Plasma enhanced chemical vapor deposition (PECVD) techniques have been shown to be an efficient method to achieve single-step synthesis of high-quality monolayer graphene (MLG) without the need of active heating. Here we report PECVD-growth of single-crystalline hexagonal bilayer graphene (BLG) flakes and mm-size BLG films with the interlayer twist angle […]


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VERITAS Discovery of VHE Emission from the Radio Galaxy 3C 264: A Multi-Wavelength Study

Posted by klaurent Chicago

Kavli Affiliate: Scott P. Wakely| First 5 Authors: A. Archer, A. Archer, , , | Summary:The radio source 3C 264, hosted by the giant elliptical galaxy NGC 3862, was observed with VERITAS between February 2017 and May 2019. These deep observations resulted in the discovery of very-high-energy (VHE; E $>100$ GeV) $γ$-ray emission from this […]


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S-duality and correlation functions at large R-charge

Posted by klaurent Tokyo

Kavli Affiliate: Simeon Hellerman | Summary:We study the ratio of pairs of adjacent correlators of Coulomb-branch operators in $SU(2)$ $mathcalN=2$ SQCD with four flavors within the framework of the Large Quantum Number Expansion. Capitalizing on the order-by-order S-duality invariance of the large-R-charge expansion we compute ab initio the dependence of the leading large-$mathcalJ$ behavior on […]


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S-duality and correlation functions at large R-charge

Posted by klaurent Tokyo

Kavli Affiliate: Simeon Hellerman | First 5 Authors: Simeon Hellerman, Shunsuke Maeda, Domenico Orlando, Susanne Reffert, Masataka Watanabe | Summary: We study the ratio of pairs of adjacent correlators of Coulomb-branch operators in $SU(2)$ $mathcal{N}=2$ SQCD with four flavors within the framework of the Large Quantum Number Expansion. Capitalizing on the order-by-order S-duality invariance of […]


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Witten Anomaly in 4d Heterotic Compactificaitons with N = 2 Supersymmetry

Posted by klaurent Tokyo

Kavli Affiliate: Taizan Watari | Summary:We showed that there is no SU(2) Witten anomaly in a large class of 4d N = 2 supersymmetric Heterotic string compactifications. The consistency conditions we consider are the modularity of the new supersymmetric index, the integrality of BPS indices, and the discrete Peccei-Quinn shift symmetries. We also found an […]


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Quasiparticle lifetime of the repulsive Fermi polaron

Posted by klaurent Caltech

Kavli Affiliate: Nelson Darkwah Oppong| Summary:We investigate the metastable repulsive branch of a mobile impurity coupled to a degenerate Fermi gas via short-range interactions. We show that the quasiparticle lifetime of this repulsive Fermi polaron can be experimentally probed by driving Rabi oscillations between weakly and strongly interacting impurity states. Using a time-dependent variational approach, […]


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KELT-9 b’s Asymmetric TESS Transit Caused by Rapid Stellar Rotation and Spin-Orbit Misalignment

Posted by klaurent MIT

Kavli Affiliate: Robert F. Goeke | First 5 Authors: John P. Ahlers, Marshall C. Johnson, Keivan G Stassun, Knicole D. Colon, Jason W. Barnes | Summary: KELT-9 b is an ultra hot Jupiter transiting a rapidly rotating, oblate early-A-type star in a polar orbit. We model the effect of rapid stellar rotation on KELT-9 b’s […]


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Prospects for High-Elevation Radio Detection of >100 PeV Tau Neutrinos

Posted by klaurent Chicago

Kavli Affiliate: Eric Oberla | Summary:Tau neutrinos are expected to comprise roughly one third of both the astrophysical and cosmogenic neutrino flux, but currently the flavor ratio is poorly constrained and the expected flux at energies above $10^17$ eV is low. We present a detector concept aimed at measuring the diffuse flux of tau neutrinos […]


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Addressing Ancestry Disparities in Genomic Medicine: A Geographic-aware Algorithm

Posted by dbos Berkeley

Kavli Affiliate: Carlos Bustamante | First 5 Authors: Daniel Mas Montserrat, Arvind Kumar, Carlos Bustamante, Alexander Ioannidis, | Summary: With declining sequencing costs a promising and affordable tool is emerging in cancer diagnostics: genomics. By using association studies, genomic variants that predispose patients to specific cancers can be identified, while by using tumor genomics cancer […]


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Optical design of diffraction-limited X-ray telescopes

Posted by klaurent MIT

Kavli Affiliate: Mark Schattenburg | Summary:Astronomical imaging with micro-arcsecond ($μ$as) angular resolution could enable breakthrough scientific discoveries. Previously-proposed $μ$as X-ray imager designs have been interferometers with limited effective collecting area. Here we describe X-ray telescopes achieving diffraction-limited performance over a wide energy band with large effective area, employing a nested-shell architecture with grazing-incidence mirrors, while […]


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