Готові списки джерел за темами / Excitonic ferromagnetism

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Добірка наукової літератури з теми "Excitonic ferromagnetism"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Excitonic ferromagnetism"

Balents, Leon, and Chandra M. Varma. "Ferromagnetism in Doped Excitonic Insulators." Physical Review Letters 84, no. 6 (February 7, 2000): 1264–67. http://dx.doi.org/10.1103/physrevlett.84.1264.

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Ghose, Srabantika, N. Gogurla, R. Ranganathan, and D. Jana. "The simultaneous emergence of free exciton emission and d0 ferromagnetism for undoped ZnO nanoparticles." RSC Advances 6, no. 87 (2016): 83909–15. http://dx.doi.org/10.1039/c6ra17151f.

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Balents, Leon. "Excitonic order at strong coupling: Pseudospin, doping, and ferromagnetism." Physical Review B 62, no. 4 (July 15, 2000): 2346–57. http://dx.doi.org/10.1103/physrevb.62.2346.

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Kasuya, Tadao. "Excitonic Wigner crystal and high Tc ferromagnetism in RB6." Journal of Magnetism and Magnetic Materials 222, no. 1-2 (December 2000): 233–43. http://dx.doi.org/10.1016/s0304-8853(00)00570-9.

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Kumar, S., J. K. Sharma, S. K. Sharma, A. Dhupar, V. Sharma, and A. Gaur. "Structural, electrical and magnetic properties of glucose-capped CdS nanoparticles." International Journal of Materials Research 111, no. 10 (October 1, 2020): 799–806. http://dx.doi.org/10.1515/ijmr-2020-1111003.

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Abstract CdS nanoparticles are synthesized by a simple chemical coprecipitation technique using glucose as a capping/complexing agent and their structural, morphological, electrical and magnetic properties are studied. X-ray diffraction results reveal the pure phase formation of CdS nanoparticles along with a wurtzite structure. The interaction of the glucose with CdS nanoparticles is evident from the distinct absorption bands and peaks in the Fourier transform infrared spectra. Field effect scanning electron microscope and high resolution transmission electron microscope images depict weakly aggregated spherical nanoparticles of size ~2- 20 nm. The selective area electron diffraction pattern exhibits well-resolved diffraction rings representing the polycrystalline nature of the nanoparticles. The optical band gap has been calculated using Tauc’s plot and found to be 2.58 eV, which is higher than the band gap of the bulk phase wurtzite CdS. The existence of the excitonic peak and the blue-shift in the absorption threshold confirm the quantum confinement in the synthesized nanoparticles. The temperature dependence of d. c. conductivity is studied and observed a linear response through current-voltage characteristics. Weak ferromagnetism is also observed in the synthesized CdS nanoparticles irrespective of the diamagnetic nature of CdS in bulk form. The observation of weak ferromagnetism in the synthesized nanoparticles proposes them as a potential candidate for diluted magnetic semiconductors.

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Родина, А. В., А. А. Головатенко, Е. В. Шорникова та Д. Р. Яковлев. "Спиновая физика экситонов в коллоидных нанокристаллах". Физика твердого тела 60, № 8 (2018): 1525. http://dx.doi.org/10.21883/ftt.2018.08.46337.07gr.

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AbstractWe present a review of spin-dependent properties of excitons in semiconductor colloidal nanocrystals. The photoluminescences (PL) properties of neutral and charged excitons (trions) are compared. The mechanisms and the polarization of radiative recombination of a “dark” (spin-forbidden) exciton that determines the low-temperature PL of colloidal nanocrystals are discussed in detail. The radiative recombination of a dark exciton becomes possible as a result of simultaneous flips of the surface spin and electron spin in a dark exciton that leads to admixture of bright exciton states. This recombination mechanism is effective in the case of a disordered state of the spin system and is suppressed if the polaron ferromagnetic state forms. The conditions and various mechanisms of formation of the spin polaron state and possibilities of its experimental detection are discussed. The experimental and theoretical studies of magnetic field-induced circular polarization of PL in ensembles of colloidal nanocrystals are reviewed.

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Kamran, Muhammad Arshad, Bingsuo Zou, Kang Zhang, Xiongtao Yang, Fujian Ge, Lijie Shi, and Thamer Alharbi. "Dual-Color Lasing Lines from EMPs in Diluted Magnetic Semiconductor CdS:NiI Structure." Research 2019 (October 29, 2019): 1–15. http://dx.doi.org/10.34133/2019/6956937.

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Анотація:

Have one ever seen a semiconductor that can issue two-color lasing lines? The diluted magnetic semiconductor (DMS) can do this. Here, we have observed dual lasing lines of 530 nm and 789 nm from a DMS structure of CdS:NiI, in which the excitonic magnetic polaron (EMP) and localized excitonic magnetic polaron (LEMP) are excitations out of ferromagnetic (NiS)x nanocluster and NiI2 nanoclusters within CdS lattice; both of them could lead to the collective EMP state at high excitation and therein produce coherent emission lines simultaneously. This occurrence is due to the superposition of EMP near CdS bandedge and the combination of the charge-transfer band of (NiI)n cluster with the LEMP within CdS lattice by overcoming the strong electron correlation of NiI cluster in a DMS structure, evidenced also by ab initio calculation. This finding opens a way to understand the collective behaviour of spin-coupled excitons in DMS and to find novel applications in the spin-related quantum technology.

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CAO, WEI, VLADIMIR PANKRATOV, MARKO HUTTULA, LIANA SHIRMANE, YU RAN NIU, and FENG WANG. "X-RAY PHOTOEMISSION ELECTRON MICROSCOPE DETERMINATION OF ORIGINS OF ROOM TEMPERATURE FERROMAGNETISM AND PHOTOLUMINESCENCE IN HIGH Co-CONTENT CoxZn1-xO FILMS." Surface Review and Letters 21, no. 04 (August 2014): 1450058. http://dx.doi.org/10.1142/s0218625x14500589.

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In this paper, we reported on the X-ray photoemission electron microscope (XPEEM) determination of magnetic and luminescence origins for two Co x Zn 1-x O films. The cobalt fraction x of radio frequency co-sputtered samples were 0.86(2) and 0.92(2), respectively. Films were ferromagnetic and semiconductive. Unique narrow green color lines beside the ZnO intrinsic emissions were found with a decay time in microsecond range at room temperature. Origins of magnetic and luminescence properties were determined with XPEEM. The X-ray absorption near edge structure at the Co L3-edge denoted that Co was partially oxidized, and phase-contrast images together with chemical composition identification further proved that Co and CoO co-existed in the samples. The ferromagnetism was attributed to ferromagnetism of Co clusters partially canceled by the antiferromagnetism of its oxide, and the photoluminescence to bound exciton in ZnO nanoclusters and defect related centers of ZnO nanoclusters in a Co -rich matrix. Present results show possibilities for adjusting magnetic and luminescence properties of Co – ZnO compounds by changing the cobalt concentration.

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Fernández-Rossier, J., and C. Tejedor. "Ferromagnetism in 2D Exciton Condensates." physica status solidi (a) 164, no. 1 (November 1997): 343–46. http://dx.doi.org/10.1002/1521-396x(199711)164:1<343::aid-pssa343>3.0.co;2-0.

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Li, Bao-Xing. "The Condensation and Ferromagnetism of Triplet Frenkel Excitons." physica status solidi (b) 168, no. 2 (December 1, 1991): 479–87. http://dx.doi.org/10.1002/pssb.2221680210.

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Дисертації з теми "Excitonic ferromagnetism"

Brydon, Philip M. R. "Coexistence of superconductivity and excitonic ferromagnetism." View electronic text, 2002. http://eprints.anu.edu.au/documents/disk0/00/00/07/63/index.html.

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Thesis (BSc. (Hons))--Australian National University, 2002.
Available via the Australian National University Library Electronic Pre and Post Print Repository. Title from title screen (viewed Mar. 27, 2003). "A thesis submitted for the degree of Honours in theoretical physics at the Department of Physics and Theoretical Physics, The Faculty of Science, The Australian National University" "Honours thesis submitted November 2002" Includes bibliographical references.

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Ferrand, David. "Interactions d'échange ferromagnétiques induites par un gaz de trous dans des hétérostructures 2D et des couches 3D de semi-conducteurs II-VI." Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10174.

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L'electronique de spin se propose de realiser de nouveaux dispositifs bases sur le controle a la fois du spin et de la charge des porteurs. Dans ce cadre, les semiconducteurs magnetiques dilues ii-vi (cd ( 1 - x )mn xte et zn ( 1 - x )mn xte) constituent des materiaux modeles pour les etudes fondamentales avec des systemes physiques originaux comportant des spins localises couples par des interactions d'echange avec un gaz de porteurs de dimensionalite variable (3d, 2d), et avec une densite que l'on peut faire varier independamment de la concentration de spins. Ce travail est consacre a l'etude de deux types de structures, des couches epaisses 3d de zn ( 1 - x )mn xte degenerees de type p, et des heterostructures 2d constituees de puits quantiques cd ( 1 - x )mn xte dopes p par modulation de dopage. On observe dans ces deux types d'echantillons des interactions d'echange ferromagnetiques induites par le gaz de trous (temperature de curie-weiss positive), et la presence d'une phase magnetique ordonnee en dessous de la temperature de curie-weiss. Les temperatures de curie-weiss observees sont en bon accord avec la description du couplage entre les spins et le gaz de trous dans un modele de champ moyen les couches de zn ( 1 - x )mn xte ont ete caracterisees avec des mesures de transport sous champ magnetiques entre 1. 5k et 300k et des mesures d'aimantation. Les mesures de transport montrent la presence d'effets de localisation importants en dessous de 15k avec la formation de polarons magnetiques et la presence d'effet hall anormal resultant de l'effet important du couplage spin-orbite sur les trous. Les proprietes magnetiques des puits quantiques sont determinees par spectroscopie magnetooptique en champ faible. Nous avons caracterise les proprietes electroniques du gaz de trous 2d avec des mesures de transport entre 300k et 15k et par des mesures de spectroscopie magnetooptique en champ fort (0-20t) qui mettent en evidence un role important des effets excitoniques (excitons, excitons charges x+).

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Haury, Axel. "Hétérostructures à puits quantique Cd(Mn)Te/CdMgZnTe dopées pgaz de trous et phase ferromagnétique." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10205.

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Nous presentons la premiere mise en evidence d'une phase ferromagnetique dans des heterostructures a puits quantique semimagnetique cdmnte/cdmgznte dopees p par modulation (azote) dans les barrieres. Dans de tels echantillons, le transfert de trous des barrieres dans le puits cree un gaz de trous quasi-bidimensionnel dans la couche de cdmnte. Pour optimiser les conditions de dopage, une etude preliminaire a ete menee sur une serie d'echantillons a puits quantiques non magnetiques cdte/cdmgznte montrant que, dans des puits de 80 a, le gaz de trous devient metallique pour des densites superieures a 1. 5 x 10#1#1 cm#-#2. En outre, ces echantillons nous ont permis d'observer les deux types d'excitons charges x#+ et x#-. Dans les echantillons a puits semimagnetique cdmnte, l'interaction d'echange entre les ions magnetiques mn#+#+ et le gaz de trous en phase metallique ( 2 x 10#1#1 cm#-#2) cree un couplage ferromagnetique du type rkky entre les spins localises des ions mn#+#+. Dans des puits d'une largeur de 80 a et pour des concentrations de mn d'environ 3%, l'interaction ferromagnetique induite par le systeme de trous bidimensionnel devient superieure au couplage antiferromagnetique de superechange entre les ions magnetiques mn#+#+. Ceci se traduit par une transition de phase ferromagnetique a la temperature critique t#c d'environ 2 k. La phase paramagnetique au dessus de t#c est caracterisee par une augmentation spectaculaire de la susceptibilite magnetique.

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Brydon, Philip. "Coexistence of superconductivity and excitonic ferromagnetism." Thesis, 2002. http://hdl.handle.net/1885/41356.

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In this thesis, we present the results of an investigation into the appearance of superconductivity in the excitonic ferromagnet. We find that such a coexistence is possible at zero temperature within the self-consistent hartree-Fock approximation.

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Частини книг з теми "Excitonic ferromagnetism"

Boothroyd, Andrew T. "Magnetic Excitations." In Principles of Neutron Scattering from Condensed Matter, 257–310. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198862314.003.0008.

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In this chapter, the neutron inelastic scattering spectrum is calculated for a variety of magnetic systems. A number of isolated magnetic systems are considered, including single-ion crystal field and intermultiplet excitations, and magnetic clusters. Linear spin-wave theory, a method for calculating the collective spin dynamics in magnetically ordered systems, is outlined and applied to ferromagnets and antiferromagnets both with and without anisptropy. The Random Phase Approximation (RPA) method for the generalized susceptibility is presented and applied to calculate the spectrum of crystal field excitons in praseodymium. The nature of the spin excitations in itinerant magnets is described, and the generalized susceptibility is calculated in the RPA for itinerant electrons with echange correlations. General features of the spin dynamical response in quantum magnets are described, and illustrated by the magnetic spectra of quantum spin chains.

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Тези доповідей конференцій з теми "Excitonic ferromagnetism"

Hashimoto, Y. "Photo-induced ferromagnetism in bulk-Cd0.95Mn0.05Te via exciton magnetic polarons." In PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors - ICPS-27. AIP, 2005. http://dx.doi.org/10.1063/1.1994619.

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