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Spin Hall effect in prototype Rashba ferroelectrics GeTe and SnTe

npj Computational Materials 2020年第1期6卷 1607-1613页

作者： Haihang Wang Priya Gopal silvia picozzi Stefano Curtarolo Marco Buongiorno Nardelli Jagoda Sławińska Department of Physics University of North TexasDentonTX 76203USA Consiglio Nazionale delle Ricerche Istituto SPINUOS L’AquilaSede di lavoro CNR-SPIN c/o Univ.G.D’Annunzio66100 ChietiItaly Center for Autonomous Materials Design Duke UniversityDurhamNC 27708USA Materials Science Electrical EngineeringPhysics and ChemistryDuke UniversityDurhamNC 27708USA

Ferroelectric Rashba semiconductors(FERSCs)have recently emerged as a promising class of spintronics *** peculiar coupling between spin and polar degrees of freedom responsible for several exceptional properties,including ferroelectric switching of Rashba spin texture,suggests that the electron’s spin could be controlled by using only electric *** this regard,recent experimental studies revealing charge-to-spin interconversion phenomena in two prototypical FERSCs,GeTe and SnTe,appear extremely ***,by employing density functional theory calculations,we investigate spin Hall effect(SHE)in these materials and show that it can be large either in ferroelectric or paraelectric *** further explore the compatibility between doping required for the practical realization of SHE in semiconductors and polar distortions which determine Rashba-related phenomena in FERSCs,but which could be suppressed by free charge carriers.

关键词： structure Rashba ferroelectric

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Near and Mid Infrared Spectroscopy to Detect Malolactic Biotransformation of Oenococcus oeni in a Wine-Model

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Journal of Agricultural Science and Technology(A) 2014年第6期4卷 475-486页

作者： Vigentini Ileana Grassi silvia Sinelli Nicoletta Di Egidio Valentina picozzi Claudia Foschino Roberto Casiraghi Ernestina Department of Food Environmental and Nutritional Sciences (DEFENS) Milan 20133 Italy

The aim of this work was to verify the potential of infrared （IR） spectroscopy in near and mid regions to detect the beginning of the malolactic fermentation （MLF） occurring in a model-wine and the further cells autolysis. MLF in wine is a secondary biotransformation due to lactic acid bacteria that usually occurs spontaneou,;ly or after starter inoculation at the end of alcoholic fermentation. Nowadays, it is desirable to supply winemakers with a new rapid and non-destructive approach to monitor MLF progress and 1R spectroscopy technology appears to be suitable for this purpose. The transformation of L-malic acid into L-lactic acid was carried out by inoculating a synthetic wine with an Oenococcus oeni culture and it was monitored through microbiological and chemical methods. At the same time, Fourier transform near infrared （FT-NIR） spectral data, in diffusive transflection mode using an optic probe, and FT-IR spectra, using an germanium crystal attenuated total reflectance （ATR） cell, were collected. Principal component analysis of the spectra was able to identify absorption bands related to the key molecular modifications that took place during the L-malic acid transformation. Thus, the samples were discriminated according to the fermentation phase. Although this study is a preliminary approach, results confirm that near infrared （NIR） and mid infrared （MIR） spectroscopy could be successfully applied to detect the start of MLF and the autolysis of the lactic acid bacteria （LAB） cells.

关键词： Malolactic fermentation wine FT-IR FT-NIR Oenococcus oeni.

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