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Supplementing our STM and electron emission studies investigations, concluding in electron pairing in strong laser fields [1], further time-of-flight electron emission studies were carried out, changing the angle of polarization of the…

光学 · 物理学 2015-06-02 N. Kroó , P. Rácz , S. Varró

The circularly polarized electroluminescence (CPEL) from silicon nanostructures which are the p-type ultra-narrow silicon quantum well (Si-QW) confined by {\delta}-barriers heavily doped with boron, 5 10^21 cm^-3, is under study as a…

介观与纳米尺度物理 · 物理学 2015-05-28 N. T. Bagraev , L. E. Klyachkin , R. V. Kuzmin , A. M. Malyarenko

In this letter, we show efficient electrical spin injection into a SiGe based \textit{p-i-n} light emitting diode from the remanent state of a perpendicularly magnetized ferromagnetic contact. Electron spin injection is carried out through…

材料科学 · 物理学 2009-11-13 L. Grenet , M. Jamet , P. Noé , V. Calvo , J. -M. Hartmann , L. E. Nistor , B. Rodmacq , S. Auffret , P. Warin , Y. Samson

We characterize spin-polarized lasing in a two-dimensional photonic lattice fabricated from a GaAs/InGaAs semiconductor microcavity sample. The lattice is defined by a staggered arrangement of rounded rectangular micrometric mesas that…

The magnetic and dielectric properties of \aa kermanite Sr$_2$CoSi$_2$O$_7$ single crystals in high magnetic fields were investigated. We have observed finite induced electric polarization along the c axis in high fields, wherein all Co…

强关联电子 · 物理学 2012-08-30 M. Akaki , H. Iwamoto , T. Kihara , M. Tokunaga , H. Kuwahara

Electron spin polarization up to 100% has been observed in type-II narrow-gap heterostructures with ultrathin InSb insertions in an InAs matrix via investigation of circularly polarized photoluminescence in an external magnetic field…

介观与纳米尺度物理 · 物理学 2015-06-12 Ya. V. Terentyev , M. S. Mukhin , A. A. Toropov , M. O. Nestoklon , B. Ya. Meltser , A. N. Semenov , V. A. Solovyev , S. V. Ivanov

We present the dielectric and magnetodielectric properties of Pr0.6Ca0.4MnO3 polycrystalline sample. Dielectric permittivity ({\epsilon'}) (and d{\epsilon'}/dT) portrays the charge order and other magnetic transitions observed in the…

强关联电子 · 物理学 2013-05-07 K Devi Chandrasekhar , A K Das , A Venimadhav

The general model for incoherent synchrotron radiation has long been known, with the first theory being published by Westfold in $1959$ and continued by Westfold and Legg in $1968$. When this model was first developed it was applied to…

高能天体物理现象 · 物理学 2015-06-24 Diarmaid de Búrca , Andrew Shearer

We show that ionization of noble gas atoms by strong infrared circularly polarized laser field under standard exerimental conditions can yield electrons with up to 100% spin polarization in energy resolved measurements. Spin polarization…

原子物理 · 物理学 2013-07-18 Ingo Barth , Olga Smirnova

An initially isotropic medium, when subjected to either a magnetic field or a coherent field, can induce anisotropy in the medium and can cause the polarization of a probe field to rotate. Therefore the rotation of probe polarization, due…

量子物理 · 物理学 2016-08-15 Anil K. Patnaik , G. S. Agarwal

We report the room-temperature electroluminescence (EL) with nearly pure circular polarization (CP) from GaAs-based spin-polarized light-emitting diodes (spin-LEDs). External magnetic fields are not used during device operation. There are…

光学 · 物理学 2017-07-05 N. Nishizawa , K. Nishibayashi , H. Munekata

We study the low-temperature magneto-photoluminescence (PL) from individual CdSe nanocrystals. Nanocrystals having a small "bright" exciton fine structure splitting ($<$0.5 meV) exhibit a conventional left- and right-circularly polarized…

介观与纳米尺度物理 · 物理学 2009-03-04 H. Htoon , S. A. Crooker , M. Furis , S. Jeong , Al. L. Efros , V. I. Klimov

Polarization dependence of opto-mechanical behavior of monodomain photochromic glassy liquid crystal (LC) polymers under polarized ultraviolet light (PUV) is studied. Trans-cis photo-isomerization is generally known to be most intense at…

软凝聚态物质 · 物理学 2016-05-12 Chen Xuan , Changwei Xu , Yongzhong Huo

We calculate circularly polarized luminescence emitted parallel (vertical emission) and perpendicular (edge emission) to the growth direction from a quantum well in a spin light-emitting diode (spin-LED) when either the holes or electrons…

介观与纳米尺度物理 · 物理学 2007-05-23 Z. G. Yu , W. H. Lau , M. E. Flatte'

The nanoscale mode volumes of surface plasmon polaritons have enabled plasmonic lasers and condensates with ultrafast operation. Most plasmonic lasers are based on noble metals, rendering the optical mode structure inert to external fields.…

We find that the polarization field, B_chi, obtained by scaling the weak-parallel-field magnetoresistance at different electron densities in a dilute two-dimensional electron system in (111) silicon, corresponds to the spin susceptibility…

强关联电子 · 物理学 2009-05-15 A. A. Kapustin , A. A. Shashkin , V. T. Dolgopolov , M. Goiran , H. Rakoto* , Z. D. Kvon

The photo-luminescence features of Ge-oxygen defect centers in a 100nm thick Ge-doped silica film on a pure silica substrate were investigated by looking at the emission spectra and time decay detected under synchrotron radiation excitation…

材料科学 · 物理学 2009-11-13 F. Messina , S. Agnello , R. Boscaino , M. Cannas , S. Grandi , E. Quartarone

Dy$^{3+}$-doped silica glass whispering gallery mode microspheres are fabricated by fiber fusion splicing. They present an almost ideal spherical morphology with a radius ranging from 60 to 67 ${\mu}$m as determined by confocal laser…

We present a spintronic single photon source which emits circularly polarized light, where the helicity is determined by an applied magnetic field. Photons are emitted from an InGaAs quantum dot inside an electrically operated spin…

介观与纳米尺度物理 · 物理学 2011-03-21 Pablo Asshoff , Andreas Merz , Heinz Kalt , Michael Hetterich

We previously reported [Naruse, et al. Sci. Rep. 4, 6077, 2014] that the geometrical randomness of disk-shaped silver nanoparticles, which exhibit high reflection at near-infrared wavelengths, serves as the origin of a particle-dependent…