Band-Offset Engineering in Magnetic/Non-Magnetic Semiconductor Quantum Structures

Furdyna, J. K.; Lee, S.; Dobrowolska, M.; Wójtowicz, T.; Liu, X.

doi:10.1007/978-3-642-15856-8_4

Cited by 4 publications

(4 citation statements)

References 125 publications

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“…Nanoplatelets (NPLs) are an emerging class of colloidal nanocrystals, which are atomically flat with several monolayer thickness, resembling free-standing quantum wells . NPLs with magnetic Mn 2+ ions were synthesized in 2015, providing remarkable opportunities for wave function engineering. ,− The Mn 2+ ions were incorporated in the NPL cores or shells. , …”

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confidence: 99%

Magneto-Optics of Excitons Interacting with Magnetic Ions in CdSe/CdMnS Colloidal Nanoplatelets

et al. 2020

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Excitons in diluted magnetic semiconductors represent excellent probes for studying the magnetic properties of these materials. Various magneto-optical effects, which depend sensitively on the exchange interaction of the excitons with the localized spins of the magnetic ions can be used for probing. Here, we study core/shell CdSe/(Cd,Mn)S colloidal nanoplatelets hosting diluted magnetic semiconductor layers. The inclusion of the magnetic Mn 2+ ions is evidenced by three magneto-optical techniques using high magnetic fields up to 15 T: polarized photoluminescence, optically detected magnetic resonance, and spin-flip Raman scattering. We show that the holes in the excitons play the dominant role in exchange interaction with magnetic ions. We suggest and test an approach for evaluation of the Mn 2+ concentration based on the spin− lattice relaxation dynamics of the Mn 2+ spin system.

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confidence: 99%

Magneto-Optics of Excitons Interacting with Magnetic Ions in CdSe/CdMnS Colloidal Nanoplatelets

et al. 2020

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“…It covers such areas of research as a giant spin splitting in Mn-doped quantum wells (QWs) [19], spectroscopy of single magnetic impurities in quantum dots [20] or quantum transport of a high electron mobility 2DEG [21]. This research was the subject of many review papers and it will not be here described in detail [22].…”

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confidence: 99%

Grating Metamaterials Based on CdTe/CdMgTe Quantum Wells as Terahertz Detectors for High Magnetic Field Applications

et al. 2020

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The cyclotron and magnetoplasmon resonances were studied at 2 K in grating metamaterials fabricated on wafers with one or two modulation doped CdTe/CdMgTe quantum wells. The gratings (with the period varied between 2 μ m and 8 μ m) were prepared with an electron beam lithography either by etching or by evaporation of Au. The gratings were studied with an atomic force microscope which revealed a correlation between the depth and width of etched grooves at a constant time of etching. The sharpest resonances observed are due to excitation of magnetoplasmon in the case of Au gratings on a wafer with one quantum well. Etched samples with two quantum wells showed the strongest tuneability of magnetoplasmon resonances with the period of the grating and illumination with white light. We showed that the samples studied can be used as resonant or quasi-resonant terahertz detectors tuneable with magnetic field and white light.

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“…The spin properties and magneto-optical effects in diluted magnetic semiconductors (DMS) are greatly modified by doping with magnetic impurities . Band-offset engineering and tunable magnetic exchange interactions were demonstrated in various magnetic/nonmagnetic semiconductor nanostructures, including colloidal quantum dots and NPLs. − Manganese is considered as an extremely informative magnetic impurity for electron paramagnetic resonance (EPR), since any of its charge states has paramagnetic properties. For Mn 2+ ions, which are characterized by a half-filled 3d 5 electron shell, the orbital angular momentum vanishes, that is, the S -state 6 S 5/2 is realized.…”

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High-Frequency EPR and ENDOR Spectroscopy of Mn²⁺ Ions in CdSe/CdMnS Nanoplatelets

et al. 2023

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Semiconductor colloidal nanoplatelets based of CdSe have excellent optical properties. Their magneto-optical and spin-dependent properties can be greatly modified by implementing magnetic Mn 2+ ions, using concepts well established for diluted magnetic semiconductors. A variety of magnetic resonance techniques based on high-frequency (94 GHz) electron paramagnetic resonance in continuous wave and pulsed mode were used to get detailed information on the spin structure and spin dynamics of Mn 2+ ions in core/shell CdSe/(Cd,Mn)S nanoplatelets. We observed two sets of resonances assigned to the Mn 2+ ions inside the shell and at the nanoplatelet surface. The surface Mn demonstrates a considerably longer spin dynamics than the inner Mn due to lower amount of surrounding Mn 2+ ions. The interaction between surface Mn 2+ ions and 1 H nuclei belonging to oleic acid ligands is measured by means of electron nuclear double resonance. This allowed us to estimate the distances between the Mn 2+ ions and 1 H nuclei, which equal to 0.31 ± 0.04, 0.44 ± 0.09, and more than 0.53 nm. This study shows that the Mn 2+ ions can serve as atomic-size probes for studying the ligand attachment to the nanoplatelet surface.

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Band-Offset Engineering in Magnetic/Non-Magnetic Semiconductor Quantum Structures

Cited by 4 publications

References 125 publications

Magneto-Optics of Excitons Interacting with Magnetic Ions in CdSe/CdMnS Colloidal Nanoplatelets

Magneto-Optics of Excitons Interacting with Magnetic Ions in CdSe/CdMnS Colloidal Nanoplatelets

Grating Metamaterials Based on CdTe/CdMgTe Quantum Wells as Terahertz Detectors for High Magnetic Field Applications

High-Frequency EPR and ENDOR Spectroscopy of Mn²⁺ Ions in CdSe/CdMnS Nanoplatelets

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Band-Offset Engineering in Magnetic/Non-Magnetic Semiconductor Quantum Structures

Cited by 4 publications

References 125 publications

Magneto-Optics of Excitons Interacting with Magnetic Ions in CdSe/CdMnS Colloidal Nanoplatelets

Magneto-Optics of Excitons Interacting with Magnetic Ions in CdSe/CdMnS Colloidal Nanoplatelets

Grating Metamaterials Based on CdTe/CdMgTe Quantum Wells as Terahertz Detectors for High Magnetic Field Applications

High-Frequency EPR and ENDOR Spectroscopy of Mn2+ Ions in CdSe/CdMnS Nanoplatelets

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High-Frequency EPR and ENDOR Spectroscopy of Mn²⁺ Ions in CdSe/CdMnS Nanoplatelets