Dynamics of the localized spins interacting with two-dimensional electron gas: Coexistence of mixed and pure modes

Vladimirova, Maria; Cronenberger, Steeve; Barate, Philippe; Scalbert, D.; Terán, F. J.; Дмитриев, А. П.

doi:10.1103/physrevb.78.081305

Cited by 22 publications

(54 citation statements)

References 14 publications

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“…(1). The most important observation is the anticrossing of the modes which occurs at a certain "resonant" value of magnetic field B = B res [6,7]. As it was also shown in Ref.…”

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confidence: 70%

“…As it was also shown in Ref. [7], other types of the homogeneous spin modes may exist in the system corresponding to excitations of the ion spins decoupled from the spins of the itinerant electrons.In this paper, we develop a theory of the spin waves in diluted magnetic quantum wells placed into magnetic field. We study analytically two collective modes which correspond to coupled propagation of the electron and ion spin excitations.…”

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confidence: 92%

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confidence: 92%

“…[6,7] two modes of the collective homogeneous (k = 0) spin excitations were observed in Cd 1−x Mn x Te wells. The modes were identified [6,7,9] as the spin excitations of delocalized electrons (the electron mode) and the electrons on d-shells of Mn ions (the ion mode). The dependencies of the frequencies ω 1,2 (0) of observed modes on B are shown schematically in Fig.…”

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confidence: 99%

“…Our studies are motivated by recent experiments [5][6][7] and a theoretical discussion [7][8][9] focused on the spin dynamics in diluted magnetic Cd 1−x Mn x Te quantum wells placed into the magnetic field [10]. In Ref.…”

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Spin waves in diluted magnetic quantum wells

2011

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We study collective spin excitations in two-dimensional diluted magnetic semiconductors, placed into external magnetic field. Two coupled modes of the spin waves (the electron and ion modes) are found to exist in the system along with a number of the ion spin excitations decoupled from the electron system. We calculate analytically the spectrum of the waves taking into account the exchange interaction of itinerant electrons both with each other and with electrons localized on the magnetic ions. The interplay of these interactions leads to a number of intriguing phenomena including tunable anticrossing of the modes and a field-induced change in a sign of the group velocity of the ion mode.PACS numbers: 75.30. Ds, 76.50.+g Diluted magnetic semiconductors (DMS) have recently been the subject of great interest [1,2] due to their potential in combining magnetic and semiconductor properties in a single material. The DMS are formed by replacing of cations in ordinary semiconductors with magnetic ions, typically Mn ions. Strong exchange interaction between the itinerant electrons and the electrons localized on d-shells of the magnetic ions leads to a number of remarkable features of the DMS. In particular, it results in the effective indirect interaction between the ion spins thus promising for creating room-temperature ferromagnetic systems that may offer advantages of semiconductors. It also dramatically enhances the effective coupling of the itinerant electrons with the external magnetic field. In contrast to conventional GaAs/GaAlAs systems, where small values of g−factor prevents manipulation of the spin degree of freedom, the giant electron Zeeman splitting arising in the DMS as a manifestation of the exchange interaction can be on the order of the Fermi energy [3,4], offering a wide range of spintronics applications.Here we discuss spin excitations in the twodimensional DMS. Our studies are motivated by recent experiments [5][6][7] and a theoretical discussion [7][8][9] focused on the spin dynamics in diluted magnetic Cd 1−x Mn x Te quantum wells placed into the magnetic field [10]. In Ref. 5, the spectrum of the spin waves, ω(k), was measured. Only one excitation mode was observed. It was demonstrated that the excitations exist in a finite range of wavelengths, k < k m , and their group velocity is negative: dω(k)/dk < 0. The experimental data were interpreted [5,8] in terms of conventional spin waves in the Fermi liquids [11], while k m was attributed to the edge of the Stoner continuum of the single-particle spin excitations. Such interpretation implies that the only effect of the magnetic ions on the electron spin waves is the strong renormalization of the electron Zeeman splitting. However, more recent experimental observations [6,7] supported by theoretical studies [7,9] appear to be in disagreement with this conclusion. Indeed, in Refs. [6,7] two modes of the collective homogeneous (k = 0) spin excitations were observed in Cd 1−x Mn x Te wells. The modes were identified [6,7,9] as the spin excitations o...

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“…(1). The most important observation is the anticrossing of the modes which occurs at a certain "resonant" value of magnetic field B = B res [6,7]. As it was also shown in Ref.…”

mentioning

confidence: 70%

mentioning

confidence: 92%

mentioning

confidence: 92%

mentioning

confidence: 99%

mentioning

confidence: 99%

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