Nanoscience – Page 255 – Kavli Institute Pre-Print Publications

Atomic-scale Structural and Chemical Characterization of Hexagonal Boron Nitride Layers Synthesized at the Wafer-Scale with Monolayer Thickness Control

Posted by klaurent May 22, 2017Caltech

Kavli Affiliate: N. C. Yeh |Summary:Hexagonal boron nitride (h-BN) is a promising two-dimensional insulator with a large band gap and low density of charged impurities that is isostructural and isoelectronic with graphene. Here we report the chemical and atomic-scale structure of CVD-grown wafer-scale (~25 cm2) h-BN sheets ranging in thickness from 1-20 monolayers. Atomic-scale images […]

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Leveraging Continuous Material Averaging for Inverse Electromagnetic Design

Posted by klaurent May 19, 2017Berkeley

Kavli Affiliate: Eli Yablonovitch | Summary:Inverse electromagnetic design has emerged as a way of efficiently designing active and passive electromagnetic devices. This maturing strategy involves optimizing the shape or topology of a device in order to improve a figure of merit–a process which is typically performed using some form of steepest descent algorithm. Naturally, this […]

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Inverse Design of Near Unity Efficiency Perfectly Vertical Grating Couplers

Posted by klaurent May 19, 2017Berkeley

Kavli Affiliate: Eli Yablonovitch | Summary:Efficient coupling between integrated optical waveguides and optical fibers is essential to the success of integrated photonics. While many solutions exist, perfectly vertical grating couplers which scatter light out of a waveguide in the direction normal to the waveguide’s top surface are an ideal candidate due to their potential to […]

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Mechanics of epithelial tissue formation

Posted by klaurent May 17, 2017Delft

Kavli Affiliate: Timon Idema | Summary:A key process in the life of any multicellular organism is its development from a single egg into a full grown adult. The first step in this process often consists of forming a tissue layer out of randomly placed cells on the surface of the egg. We present a model […]

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Interval Functions and their Integrals, by Ralph Henstock, Ph.D. thesis, 1948

Posted by klaurent February 23, 2017Cornell

Kavli Affiliate: Daniel Ralph | First 5 Authors: Ralph Henstock, Ralph Henstock, , , | Summary: Ralph Henstock (1923 – 2007) worked in non-absolute integration, including the Riemann-complete or gauge integral which, independently, Jaroslav Kurzweil also discovered in the 1950’s. As a Cambridge undergraduate Henstock took a course of lectures, by J.C. Burkill, on the […]

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Valley-spin polarized Landau levels in a monolayer semiconductor

Posted by klaurent February 18, 2017Cornell

Kavli Affiliate: Jie Shan | First 5 Authors: Zefang Wang, Zefang Wang, , , | Summary: Electrons in monolayer transition metal dichalcogenides (TMDs) possess both the valley and spin degree of freedom. These internal quantum degrees of freedom have provided an ideal laboratory for exploring both new physical phenomena and electronics and photonics applications. Valley- […]

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Valley-spin polarized Landau levels in a monolayer semiconductor

Posted by klaurent February 18, 2017Cornell

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GHz-Band Integrated Magnetic Inductors

Posted by klaurent February 9, 2017Cornell

Kavli Affiliate: Amal El-Ghazaly | Summary:The demand on mobile electronics to continue to shrink in size while increase in efficiency drives the demand on the internal passive components to do the same. Power amplifiers require inductors with small form factors, high quality factors, and high operating frequency in the single-digit GHz range. This work explores […]

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Hard superconducting gap in InSb nanowires

Posted by klaurent February 8, 2017Delft

Kavli Affiliate: Sonia Conesa-Boj | Summary:Topological superconductivity is a state of matter that can host Majorana modes, the building blocks of a topological quantum computer. Many experimental platforms predicted to show such a topological state rely on proximity-induced superconductivity. However, accessing the topological properties requires an induced hard superconducting gap, which is challenging to achieve […]

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KELT-18b: Puffy Planet, Hot Host, Probably Perturbed

Posted by klaurent February 6, 2017Caltech

Kavli Affiliate: David A. Tirrell| First 5 Authors: Kim K. McLeod, Kim K. McLeod, , , | Summary:We report the discovery of KELT-18b, a transiting hot Jupiter in a 2.87d orbit around the bright (V=10.1), hot, F4V star BD+60 1538 (TYC 3865-1173-1). We present follow-up photometry, spectroscopy, and adaptive optics imaging that allow a detailed […]

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