Regarding the Main Spectral Lines of a Two-dimensional Two-Electron Atom

2019 ◽  
Vol 61 (11) ◽  
pp. 2085-2091
Author(s):  
V. V. Skobelev
Keyword(s):  
Spectral Lines ◽  
Two Dimensional ◽  
Electron Atom

scholarly journals Оптическая спектроскопия крамерсовских дублетов иона Er-=SUP=-3+-=/SUP=- в двумерном фрустированном магнетике Cu-=SUB=-3-=/SUB=-Er(SeO-=SUB=-3-=/SUB=-)-=SUB=-2-=/SUB=-O-=SUB=-2-=/SUB=-Cl

2021 ◽  
Vol 129 (1) ◽  
pp. 51
Author(s):  
С.А. Климин ◽  
П.С. Бердоносов ◽  
Е.С. Кузнецова
Keyword(s):  
Magnetic Phase ◽  
Magnetic Ordering ◽  
Spectral Lines ◽  
Spin Reorientation ◽  
Model Systems ◽  
Magnetic Phase Transitions ◽  
Two Dimensional ◽  
Frustrated Magnetism ◽  
Weak Magnetic Fields ◽  
Erbium Ion

Francisites Cu3M(YO3)2O2X (M = Bi or rare earth, Y = Se, Te, X = Br, Cl, I) attract grate attention due to their interesting magnetic properties, such as metamagnetic transitions in relatively weak magnetic fields, magnetic phase transitions including spin reorientation, as well as model systems for studying two-dimensional and frustrated magnetism. In this work, a low-temperature optical spectroscopic study is presented of erbium francisite Cu3Er(SeO3)2O2Cl. The observed splittings of the spectral lines corresponding to the f f transitions in the Kramers Er3+ ion unambiguously indicates the magnetic ordering of the crystal at a temperature TN = 37.5 K. The temperature dependence of the splitting of the main doublet of the erbium ion is determined. The contribution of erbium to the heat capacity and magnetic susceptibility of Cu3Er(SeO3)2O2Cl is calculated.

scholarly journals Магнитная циркулярная поляризация фотолюминесценции экситонов

2018 ◽  
Vol 60 (8) ◽  
pp. 1503
Author(s):  
Е.Л. Ивченко
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Quantum Wells ◽  
Circular Polarization ◽  
Spectral Lines ◽  
Theoretical Studies ◽  
Two Dimensional ◽  
Bulk Semiconductors ◽  
Polarization Of Luminescence ◽  
Composition Fluctuations

AbstractExperimental and theoretical studies of circular polarization of photoluminescence of excitons (MCPL) in semiconductors placed in an external magnetic field are reviewed. The advantage of the MCPL method is its relative simplicity. In particular, it does not require spectral resolution of the Zeeman sublevels of an exciton and may be applied to a wide class of objects having broad photoluminescence spectral lines or bands: in bulk semiconductors with excitons localized on the defects of the crystal lattice and composition fluctuations, in structures with quantum wells and quantum dots of types I and II, in two-dimensional transition metals dichalcogenides and quantum microcavities. The basic mechanisms of the magnetic circular polarization of luminescence are considered. It is shown that either known mechanisms should be modified or additional mechanisms of the MCPL should be developed to describe the polarized photoluminescence in newly invented nanosystems.

scholarly journals Multiperiodic Variability and Outbursts of 28 Cygni

2000 ◽  
Vol 175 ◽  
pp. 232-235 ◽  
Author(s):  
S. Tubbesing ◽  
Th. Rivinius ◽  
B. Wolf ◽  
A. Kaufer
Keyword(s):  
Dimensional Analysis ◽  
Line Profile ◽  
Phase Distribution ◽  
Radial Velocities ◽  
Spectral Lines ◽  
Two Dimensional ◽  
Line Profiles ◽  
Constructive Interference ◽  
Mode Beating ◽  
Multi Mode

Abstract28 Cygni was observed during two seasons spectroscopically. The radial velocities of more than 15 spectral lines were measured and searched for periodic variability. Two closely spaced periods were found. A two-dimensional analysis of the line profile variability yielded the same periods and provided the power and phase distribution across the line profiles. An outburst covered by our data coincides with the time of constructive interference of both periods. 28 Cyg is the second case for which outbursts seem to be triggered by multi-mode beating.

scholarly journals Low Temperature Growth of the Nanotextured Island and Solid 3C-SiC Layers on Si from Hydric Si, Ge and C Compounds

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 491
Author(s):  
Lev K. Orlov ◽  
Vladimir I. Vdovin ◽  
Natalia L. Ivina ◽  
Eduard A. Steinman ◽  
Yurii N. Drozdov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Surface Morphology ◽  
High Frequency ◽  
Strong Electric Field ◽  
Quantum Confinement Effect ◽  
Spectral Lines ◽  
Growth Stages ◽  
Two Dimensional ◽  
Conductivity Anisotropy ◽  
Electron Dispersion

Different growth stages and surface morphology of the epitaxial 3C-SiC/Si(100) structures were studied. Heterocompositions were grown in vacuum from hydric compounds at a lower temperature. The composition, surface morphology and crystal structure of the 3C-SiC films were tested using X-ray diffraction, second ion mass spectrometry, scanning ion and electron microscopy, photo- and cathode luminescence. It was demonstrated that the fine crystal structure of the 3C-SiC islands was formed by the close-packed nanometer-size grains and precipitated on the underlying solid carbonized Si layer. Luminescence spectral lines of the solid carbonized Si layer, separated island and solid textured 3C-SiC layer were shifted toward the high ultraviolet range. The spectra measured by different methods were compared and the nature of the revealed lines was considered. This article discusses a quantum confinement effect observation in the 3C-SiC nanostructures and a perspective for the use of nanotextured island 3C-SiC layers as a two-dimensional surface quantum superlattice for high-frequency applications. The conductivity anisotropy and current-voltage characteristics of the two-dimensional superlattices with a non-additive electron dispersion law in the presence of a strong electric field were studied theoretically. Main efforts were focused on a search of the mechanisms allowing realization of the high-frequency negative dynamical conductivity for the structures having a positive static differential conductivity.

scholarly journals Excitons, trions and Rydberg states in monolayer MoS2 revealed by low-temperature photocurrent spectroscopy

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Daniel Vaquero ◽  
Vito Clericò ◽  
Juan Salvador-Sánchez ◽  
Adrián Martín-Ramos ◽  
Elena Díaz ◽  
...  
Keyword(s):  
Low Temperature ◽  
Excited States ◽  
Rydberg States ◽  
Spectral Lines ◽  
Spectral Features ◽  
Two Dimensional ◽  
Monolayer Mos2 ◽  
Rydberg Series ◽  
Photocurrent Spectroscopy ◽  
Excitonic Transitions

Abstract Exciton physics in two-dimensional semiconductors are typically studied by photoluminescence spectroscopy. However, this technique does not allow for direct observation of non-radiating excitonic transitions. Here, we use low-temperature photocurrent spectroscopy as an alternative technique to investigate excitonic transitions in a high-quality monolayer MoS2 phototransistor. The resulting spectra presents excitonic peaks with linewidths as low as 8 meV. We identify spectral features corresponding to the ground states of neutral excitons ($${\mathrm{X}}_{1{\mathrm{s}}}^{\mathrm{A}}$$ X 1 s A and $${\mathrm{X}}_{1{\mathrm{s}}}^{\mathrm{B}}$$ X 1 s B ) and charged trions (TA and TB) as well as up to eight additional spectral lines at energies above the $${\mathrm{X}}_{1{\mathrm{s}}}^{\mathrm{B}}$$ X 1 s B transition, which we attribute to the Rydberg series of excited states of XA and XB. The intensities of the spectral features can be tuned by the gate and drain-source voltages. Using an effective-mass theory for excitons in two-dimensional systems we are able to accurately fit the measured spectral lines and unambiguously associate them with their corresponding Rydberg states.

scholarly journals Zeeman Doppler Imaging

1995 ◽  
Vol 149 ◽  
pp. 340-349
Author(s):  
M. Semel
Keyword(s):  
Magnetic Field ◽  
Spectral Lines ◽  
Doppler Imaging ◽  
High Spectral Resolution ◽  
Two Dimensional ◽  
Stellar Rotation ◽  
Time Variations ◽  
Set Up ◽  
Star Surface ◽  
The Magnetic Field

AbstractStellar rotation maps the surface of a star into its line spectrum and gives a dimension to a point on the star - the Doppler dimension. This is of great importance for the detection of Zeeman polarization especially in certain cases. Typically a magnetic configuration will exhibit both polarities, thus the polarization signals of oposite signs may superpose and cancel. The Doppler coordinate will be in general different for parts of the stars having different polarities and therefore the polarization signals will also appear at different wavelengths and will not cancel. Moreover, the time variations plus the Doppler coordinate constitutes two variables that may allow the reconstruction of two dimensional map of the magnetic field over the star surface.Attention will be given to the set-up that allows spectropolarimetry with high spectral resolution and high S/N ratio. The use of cross dispersion spectrographs allows one to observe several tens of spectral lines. The method of adding signals to increase S/N ratio will be indicated.

Spectrophotometric measurements of objective-prism spectra

1966 ◽  
Vol 24 ◽  
pp. 118-119
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Progress Report ◽  
Two Dimensional ◽  
Objective Prism ◽  
Made In

I should like to give you a very condensed progress report on some spectrophotometric measurements of objective-prism spectra made in collaboration with H. Leicher at Bonn. The procedure used is almost completely automatic. The measurements are made with the help of a semi-automatic fully digitized registering microphotometer constructed by Hög-Hamburg. The reductions are carried out with the aid of a number of interconnected programmes written for the computer IBM 7090, beginning with the output of the photometer in the form of punched cards and ending with the printing-out of the final two-dimensional classifications.

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