Indirect-exchange interactions in zero-gap semiconductors

Bastard, G.; Lewiner, Colette

doi:10.1103/physrevb.20.4256

Cited by 62 publications

(19 citation statements)

References 8 publications

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“…In this term, the nearestneighbor (NN) AFM interaction is expected to be rather strong (J NN /k B ≈ 5 K [25,26]), such that for magnetic fields lower than 5 T [= (2J NN − 5k B T e, max )/(g Mn μ B ), where T e, max = 823 mK], NN are always antiferromagnetically coupled and thus do not contribute to the GZS. However, the next-nearest neighbors (NNN) of manganese atom interaction are weaker (J NNN /k B = 0.5 K [28][29][30][31]) and can play a role already at B ∼ 0.5 T and T ∼ 200 mK and similar or lower B/T values. We note that the interaction strength between third-and higher-order NN is generally small and decreases exponentially with distance [31,32].…”

Section: Characteristics Of the Sdh Nodesmentioning

confidence: 99%

Magnetoresistance quantum oscillations in a magnetic two-dimensional electron gas

et al. 2015

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Magnetotransport measurements of Shubnikov-de Haas (SdH) oscillations have been performed on twodimensional electron gases (2DEGs) confined in CdTe and CdMnTe quantum wells. The quantum oscillations in CdMnTe, where the 2DEG interacts with magnetic Mn ions, can be described by incorporating the electron-Mn exchange interaction into the traditional Lifshitz-Kosevich formalism. The modified spin splitting leads to characteristic beating pattern in the SdH oscillations, the study of which indicates the formation of Mn clusters resulting in direct anti-ferromagnetic Mn-Mn interaction. The Landau-level broadening in this system shows a peculiar decrease with increasing temperature, which could be related to statistical fluctuations of the Mn concentration.

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Section: Characteristics Of the Sdh Nodesmentioning

confidence: 99%

Magnetoresistance quantum oscillations in a magnetic two-dimensional electron gas

et al. 2015

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“…Conduction electron spins interacting with the magnetic impurity spins can mediate an indirect exchange interaction between two localized impurity spins in bulk metals [1][2][3][4][5][6][7][8][9][10][11][12][13][14] and bulk semiconductors [15][16][17][18][19], superconductors [20,21], low-dimensional systems , and topological insulators [51], namely, the RudermannKittel-Kasuya-Yosida (RKKY) interaction. Because the RKKY coupling is, in general, very weak for large-size samples, this largely restricts its application on spintronic devices.…”

Section: Introductionmentioning

confidence: 99%

Optical resonant RKKY interaction in nanosystems

Peng

Xie

2015

Can. J. Phys.

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Conduction electron spins interacting with magnetic impurity spins can lead to an indirect exchange interaction between magnetic impurities in nonmagnetic metals or semiconductors, namely, RKKY interaction. In general, this RKKY coupling is too weak to apply on devices. In this paper, we find that when a laser field of appropriate frequency irradiates the nanosystems, it can greatly strengthen the RKKY interaction. This is the so-called optical resonant RKKY interaction. We give the resonant frequencies for different size samples, and calculate the exchange integrals for these samples on the near-resonant conditions. This optical resonant RKKY coupling may be strong enough to guarantee its application on spintronic devices.Résumé : L'interaction des spins des électrons de conduction avec les spins d'impuretés magnétiques peut mener à une interaction d'échange indirect entre les impuretés magnétiques dans des métaux non magnétiques ou des semi-conducteurs, nommément l'interaction RKKY. En général, cette interaction RKKY est trop faible pour avoir des applications dans des dispositifs. Nous trouvons ici que l'illumination laser du nano-système à une fréquence appropriée peut fortement augmenter l'interaction RKKY. Cet effet s'appelle l'interaction RKKY en résonance optique. Nous donnons ici les fréquences de résonance pour différentes grosseurs d'échantillon et calculons les intégrales d'échange pour ces échantillons en situation près de la résonance. Ce couplage de RKKY en résonance optique peut être assez fort pour permettre son utilisation dans les dispositifs de spintronique. [Traduit par la Rédaction]

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“…The RKKY-interaction 18 between localized magnetic moments is well discussed for extended graphene, see Refs. 19,20, and after the experimental discovery of graphene revisited in Refs. 21-25. Here, we study a graphene nanoribbon where a gap opens at the Fermi energy.…”

Section: Introductionmentioning

confidence: 99%

Spin exchange interaction with tunable range between graphene quantum dots

2011

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We study the spin exchange between two electrons localized in separate quantum dots in graphene. The electronic states in the conduction band are coupled indirectly by tunneling to a common continuum of delocalized states in the valence band. As a model, we use a two-impurity Anderson Hamiltonian which we subsequently transform into an effective spin Hamiltonian by way of a twostage Schrieffer-Wolff transformation. We then compare our result to that from a Coqblin-Schrieffer approach as well as to fourth order perturbation theory.

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Indirect-exchange interactions in zero-gap semiconductors

Cited by 62 publications

References 8 publications

Magnetoresistance quantum oscillations in a magnetic two-dimensional electron gas

Magnetoresistance quantum oscillations in a magnetic two-dimensional electron gas

Optical resonant RKKY interaction in nanosystems

Spin exchange interaction with tunable range between graphene quantum dots

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