Optical absorption of ferro- and antiferromagnetic europium chalcogenides

Busch, G.; Junod, P.; Wächter, P.

doi:10.1016/0031-9163(64)91155-2

Cited by 130 publications

(37 citation statements)

References 2 publications

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“…But it seems to be nontrivial that the same result is also obtained in the opposite limit. Such a dependence of the band bottom shift on the change of magnetization was observed experimentally [22].…”

Section: (327)mentioning

confidence: 85%

Spin Polaron Theory for Magnetic Semiconductors with Narrow Bands

Nagaev¹

1974

Physica Status Solidi (b)

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Section: (327)mentioning

confidence: 85%

Spin Polaron Theory for Magnetic Semiconductors with Narrow Bands

Nagaev¹

1974

Physica Status Solidi (b)

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“…This explains the experimental observation of the red-shift of the absorption edge from PM to FM ordering. 64 Furthermore, based on the fact that O-2p and Eu-5d6s states experience about the same energy shift, we further predict that absorption peaks related to O-p → Eu-5d6s transitions will hardly be affected by the FM-PM transitions. We also would like to point out that our calculated exchange splitting of about 0.8 eV is comparable with the value about 0.6 eV determined by spin-resolved xray absorption spectroscopy, 7 which is performed on 20 nm thick Eu riched EuO films.…”

Section: Resultsmentioning

confidence: 99%

Spin-dependent optical response of multiferroic EuO: First-principles DFT calculations

et al. 2014

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Using first-principles density functional calculations, electronic and optical properties of ferromagnetic semiconductor EuO are investigated. In particular, we have developed a way to obtain the spin-dependent optical response of the magnetic materials, which is helpful to verify the spin-dependent band structure of EuO. Significantly different optical responses from spin-up and spin-down channels are obtained in both linear and nonlinear cases, making it possible to distinguish contributions from different spin-channels in the optical absorption spectra if spin-flip process can be neglected. In addition, the red-shift of the absorption edge from paramagnetic to ferromagnetic ordering is explained by exchange interactions. Using such method, we have also compared the optical properties of multiferroic EuO which is induced by strong epitaxial strain. Our results show that from tensile to compressive strain, the blue-shift of the leading absorption peaks in the optical spectra, the red-shift of the optical band gap in spin-up state can be observed, consistent to the energy difference between spin-splitting orbits. The spin-dependent nonlinear optical properties reveal that in the infrared and visible light region, the contributions to second-harmonic generation (SHG) susceptibilities are mainly from spin-majority channels. In addition, the strain effect is also discussed. With the increase of epitaxial strain, the larger energy shift of the leading absorption peaks, and the more remarkable nonlinear optical response can be obtained.

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“…Analysis of the rising edge of the absorption spectrum using Equation 1 estimates the band gap to be (1.69 AE 0.23) eV, which is in reasonable agreement with the band gap of the bulk material, 1.65 eV. [18][19][20] The 5d level is divided by a crystal field splitting of approximately 2.1 eV [18] at room temperature into lower t 2g…”

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confidence: 91%

Demonstration of Bulk Semiconductor Optical Properties in Processable Ag₂S and EuS Nanocrystalline Systems

et al. 2008

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Semiconductor nanocrystals (NCs) are colloidal single crystals that have been widely examined in recent years to elucidate the origins and applications of size-tunable properties. Size-tunable optical properties are particularly desirable for applications in light-emitting devices, lasers, and biological labeling. [1][2][3][4][5] Strong confinement effects, characteristic of many NCs (''quantum dots''), give them an electronic structure more like molecules than semiconductors and this is of special interest in areas such as quantum information.[6] However, while all colloidal quantum dots are NCs, not all NCs are colloidal quantum dots. This distinction between bulk and confined nanocrystals is not always obvious depending on the characteristics of the bulk band structure. In this paper we show that the optical spectra of bulk semiconductor NCs can exhibit surprising features that may be confused with quantum confinement effects. We compare the optical properties of two bulk nanocrystal systems, Ag 2 S and EuS.Bulk semiconductors have revolutionized a breadth of technologies as a consequence of the way electronic levels form delocalized bands. Although the development of new quantum dot systems have dominated semiconductor nanocrystal research, we suggest that the field of bulk NC synthesis and characterization is complementary to the well-established field of quantum-confined NCs, and offers great potential for the discovery of materials that exploit the desirable electronic and magnetic attributes of bulk semiconductors on the nanoscale. A key advantage foreseen for these NCs is that they are easily processed and they can potentially be programmed for intelligent self-assembly. [7] The realization of the scope and potential of nanoscience has stimulated the discovery of many routes for semiconductor quantum dot synthesis. Many of these reports seek to demonstrate quantum-confinement effects; that is, size-tunable absorption features as demonstrated in compelling pioneering work. [8,9] Compared to the extensive amount of research directed towards creating novel quantum dot systems, little work has been directed towards thinking about the potential of colloidal synthesis for the miniaturization of semiconductors while retaining the essential attributes of the bulk material. There are some notable exceptions to this including nanocrystalline TiO 2 which has been extensively studied for use in photovoltaics.[10] Bulk semiconductors have been, and continue to be, essential components in almost all aspects of technology. They differ from quantum-confined semiconductors in that carriers are located in bands rather than discrete energy levels, thus producing the well-known electronic properties. Nanocrystals that have these same properties could potentially find wide application in micro-and nanoelectronics because they may facilitate processing of devices on small length scales without introducing complicating quantum effects. These materials would exploit the advantages of nanocrystals, such as enhanced processabilit...

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Optical absorption of ferro- and antiferromagnetic europium chalcogenides

Cited by 130 publications

References 2 publications

Spin Polaron Theory for Magnetic Semiconductors with Narrow Bands

Spin Polaron Theory for Magnetic Semiconductors with Narrow Bands

Spin-dependent optical response of multiferroic EuO: First-principles DFT calculations

Demonstration of Bulk Semiconductor Optical Properties in Processable Ag₂S and EuS Nanocrystalline Systems

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Optical absorption of ferro- and antiferromagnetic europium chalcogenides

Cited by 130 publications

References 2 publications

Spin Polaron Theory for Magnetic Semiconductors with Narrow Bands

Spin Polaron Theory for Magnetic Semiconductors with Narrow Bands

Spin-dependent optical response of multiferroic EuO: First-principles DFT calculations

Demonstration of Bulk Semiconductor Optical Properties in Processable Ag2S and EuS Nanocrystalline Systems

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Demonstration of Bulk Semiconductor Optical Properties in Processable Ag₂S and EuS Nanocrystalline Systems