A scanning tunneling microscopy based potentiometry technique and its application to the local sensing of the spin Hall effect

A scanning tunneling microscopy based potentiometry technique for the measurements of the local surface electric potential is presented and illustrated by experiments performed on current-carrying thin tungsten films. The obtained results demonstrate a sub-millivolt resolution in the measured surface potential. The application of this potentiometry technique to the local sensing of the spin Hall effect is outlined and some experimental results are reported.Comment: 9 pages and 4 figure

The GALAH survey: using galactic archaeology to refine our knowledge of TESS target stars

An unprecedented number of exoplanets are being discovered by the Transiting Exoplanet Survey Satellite (TESS). Determining the orbital parameters of these exoplanets, and especially their mass and radius, will depend heavily upon the measured physical characteristics of their host stars. We have cross-matched spectroscopic, photometric, and astrometric data from GALAH Data Release 2, the TESS Input Catalog and Gaia Data Release 2, to create a curated, self-consistent catalogue of physical and chemical properties for 47 285 stars. Using these data, we have derived isochrone masses and radii that are precise to within 5 per cent. We have revised the parameters of three confirmed, and twelve candidate, TESS planetary systems. These results cast doubt on whether CTOI-20125677 is indeed a planetary system, since the revised planetary radii are now comparable to stellar sizes. Our GALAH-TESS catalogue contains abundances for up to 23 elements. We have specifically analysed the molar ratios for C/O, Mg/Si, Fe/Si, and Fe/Mg, to assist in determining the composition and structure of planets with Rp < 4R⊕. From these ratios, 36 per cent fall within 2$\sigma$ sigma of the Sun/Earth values, suggesting that these stars may host rocky exoplanets with geological compositions similar to planets found within our own Solar system

Effects of Various Teaching Methods on Student Comprehension of AVL Trees

poster, CAS/CSC, fall 201

Effects of Various Teaching Methods on Student Comprehension of AVL Trees

paper, CAS/CSC, fall 201

Scanning tunneling microscopy measurements of the spin Hall effect in tungsten films by using iron-coated tungsten tips

Scanning tunneling microscopy experiments using iron-coated tungsten tips and current-carrying tungsten films have been conducted. An asymmetry of the tunneling current with respect to the change of the direction of the bias current through a tungsten film has been observed. It is argued that this asymmetry is a manifestation of the spin Hall effect in the current-carrying tungsten film. Nanoscale variations of this asymmetry across the tungsten film have been studied by using the scanning tunneling microscopy technique

Technique [Volume 87, Issue 22]

Avoid Spring Break scams with careful travel plansBeyond the White and GoldBoard reviews AA hiring proceduresCouncil Clippings: HouseCouncil Clippings: SenateDeVinny becomes first to qualify for NCAAsEquestrian club welcomes all skill levelsHealth updates from colleges around the nation:iMovieFest concludes with awards ceremonyIntramural NotebookIntroduction etiquette: making a good first impressionJackets set to start softball seasonLetters to the EditorLibrary renovations to bring new look, new servicesMen's Hoops: Duke (20-1, 8-1 ACC) at Georgia Tech (10-13, 3-7 ACC)Moderate drinking may benefit healthMunch works make appearance at HighNews BriefsOUR VIEWS: Consensus Opinion"It's a real throwback to the old ways of baseball"Real World Etiquette: Seal the interview deal with proper etiquetteResNet used in security violationsSchwarzenegger disappoints with latest, 'Collateral Damage'Send handwritten thanks: writing a thank-you noteSouthern U. graduates strive to 'dress the part' for businessSTAFF EDITORIALTechs and the CityTech talent adds to Salt Lake OlympicsThe Live ListThe New Russ Chandler Stadium: Flashy beginning for baseballThe Sliver Box...Two Bit