Resonant Rayleigh scattering as a probe of spin polarization in a two-dimensional electron system

Кулик, Л. В.; Ovchinnikov, K. N.; Журавлев, А. С.; Bisti, V. E.; Кукушкин, И. В.; Schmult, S.; Dietsche, W.

doi:10.1103/physrevb.85.113403

Cited by 14 publications

(10 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 ). Moreover, at higher temperatures (above 1 K), when both spin sublevels are filled in the equilibrium and the Laughlin state ν = 1/3 is destroyed, the photoluminescence intensity from the lowest spin Landau sublevel exceeds that from the upper spin sublevel, which corresponds to the probabilities of optical transitions for analogous electronic systems 27 . The effect of enormous gain in the photoluminescence signal in the Laughlin state ν = 1/3 produced by the excited spin Landau sublevel has universal nature, i.e., it is independent of the photon energy exciting the electron system (Fig.…”

Section: Resultsmentioning

confidence: 99%

Laughlin anyon complexes with Bose properties

et al. 2021

Self Cite

View full text Add to dashboard Cite

Two-dimensional electron systems in a quantizing magnetic field are regarded as of exceptional interest, considering the possible role of anyons—quasiparticles with non-boson and non-fermion statistics—in applied physics. To this day, essentially none but the fractional states of the quantum Hall effect (FQHE) have been experimentally realized as a system with anyonic statistics. In determining the thermodynamic properties of anyon matter, it is crucial to gain insight into the physics of its neutral excitations. We form a macroscopic quasi-equilibrium ensemble of neutral excitations - spin one anyon complexes in the Laughlin state ν = 1/3, experimentally, where ν is the electron filling factor. The ensemble is found to have such a long lifetime that it can be considered the new state of anyon matter. The properties of this state are investigated by optical techniques to reveal its Bose properties.

show abstract

Section: Resultsmentioning

confidence: 99%

Laughlin anyon complexes with Bose properties

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…The change in spin stiffness of 2DES during transformation from the spin-polarized state (quantum Hall ferromagnet) to spin-depolarized state induced by either adding extra electrons (holes) in the quantum Hall ferromagnet (QHF) or heating the electron system was studied by measuring time-resolved Kerr rotation at different filling factors and electron temperatures. The electron filling factor is determined from the magnetic www.nature.com/scientificreports www.nature.com/scientificreports/ field dependence of the 2DES luminescence 24 . The spin precession dephasing dynamics is complicated and cannot be described by a simple exponential dependence 20 .…”

mentioning

confidence: 99%

Investigation of spin stiffness in spin-depolarized states of two-dimensional electron systems with time-resolved Kerr rotation

Larionov

Stepanets-Khussein

Кулик

et al. 2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

An experimental technique based on time-resolved Kerr rotation allows a comparison of the spin stiffnesses of different spin-polarized and depolarized states in a two-dimensional electron system. With this technique, a new spin-correlated phase that has no known analogues was discovered. the new spin-depolarized phase is characterized by high spin stiffness equal to that of a spin-polarized quantum Hall ferromagnet.Recently, much attention has been devoted to technological applications based on the manipulation of spin degree of freedom, which has particularly boosted the development of magnonics, the use of spin waves (magnons) for signal transfer 1-3 . More exotic applications entail the involvement of skyrmions, which are spin vortex textures that are topological charge carriers, in spin dynamics. Experimental work on the manipulation of skyrmions and measurement of their mass and characteristic drift length in crossed magnetic and electric fields has been reported 4 .Most of the aforementioned experimental achievements in manipulation of spins and their textures have been for three-dimensional magnetic systems. In contrast, for a two-dimensional electron system (2DES) in a magnetic field, which has given rise to spin-texture physics, the experimental progress is not so impressive. This is largely due to the absence of reliable experimental techniques revealing the local properties of 2DES spin subsystems, such as Lorentz transmission electron microscopy 5 . Setting aside the transport techniques that are not very sensitive to spin ordering, the key method for the characterization of a spin subsystem involves the measurement of the 2DES magnetization as a function of temperature and filling factor and comparison of the experimental data with those obtained from existing theories 6,7 . A quantum Hall ferromagnet (QHF) with a filling factor of ν = 1 is chosen as a reference point of a fully spin-polarized state with maximum achievable spin stiffness. However, for a spin depolarized 2DES, little experimental opportunities for revealing the physical reason for this depolarization exist.A breakthrough in description of spin-depolarized states was achieved when experimentalists focused on the investigation of the spin relaxation processes in a 2DES determined by the local properties of the spin subsystem. The pioneering works on nuclear spin relaxation via a contact interaction with the spins of an electron system led to the concept of skyrmions and skyrmion crystal 8,9,10 . Although the theory of skyrmion crystals was developed for two-dimensional electron systems, the actual formation of a skyrmion crystal lattice was found in three-dimensional MnSi ferromagnetic films and similar compounds with Dzyaloshinskii-Moriya interaction 5,11,12 . Thus far, there has been no compelling evidence on the existence of a skyrmion crystal in a 2DES formed by either lack or excess of electron density in a quantum Hall ferromagnet. Moreover, observations of spin excitation spectra using the inelastic light scattering technique ena...

show abstract

“…(14) by replacing L 1 ↔ L 2 and λ 1 ↔ M 2 . Equation (12) can be used to evaluate Rayleigh scattering by hydrogenic as well as many-electron systems. For the latter case, we must just replace hydrogenic states with states of many-electron systems.…”

Section: B Evaluation Of Transition Amplitude For Circular Polarizatmentioning

confidence: 99%

“…In atomic physics, especially, the polarization properties of light have been studied for various processes, such as atomic and ionic photoionization [1], hyperfine-quenched transitions [2], two-photon decay [3,4], atomic-field bremsstrahlung [5], radiative electron capture [6], and elastic scattering of light. Elastic scattering of light by atoms and ions [7,8] (so-called Rayleigh scattering) has applications in astronomy, shielding, medical diagnostics, and also is used extensively to obtain information about the structural properties of materials and complex molecules [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Relativistic polarization analysis of Rayleigh scattering by atomic hydrogen

et al. 2012

View full text Add to dashboard Cite

A relativistic analysis of the polarization properties of light elastically scattered by atomic hydrogen is performed, based on the Dirac equation and second-order perturbation theory. The relativistic atomic states used for the calculations are obtained by making use of the finite basis set method and are expressed in terms of B splines and B polynomials. We introduce two experimental scenarios in which the light is circularly and linearly polarized, respectively. For each of these scenarios, the polarization-dependent angular distribution and the degrees of circular and linear polarization of the scattered light are investigated as a function of scattering angle and photon energy. Analytical expressions are derived for the polarization-dependent angular distribution which can be used for scattering by both hydrogenic as well as many-electron systems. Detailed computations are performed for Rayleigh scattering by atomic hydrogen within the incident photon energy range 0.5 to 5 keV. Particular attention is paid to the effects that arise from higher (nondipole) terms in the expansion of the electron-photon interaction.

show abstract

Resonant Rayleigh scattering as a probe of spin polarization in a two-dimensional electron system

Cited by 14 publications

References 21 publications

Laughlin anyon complexes with Bose properties

Laughlin anyon complexes with Bose properties

Investigation of spin stiffness in spin-depolarized states of two-dimensional electron systems with time-resolved Kerr rotation

Relativistic polarization analysis of Rayleigh scattering by atomic hydrogen

Contact Info

Product

Resources

About