Electrical control of the RKKY interaction in bilayer graphene

Klier, N.; Sharma, S.; Pankratov, Oleg; Shallcross, S.

doi:10.1103/physrevb.94.205436

Cited by 14 publications

(8 citation statements)

References 36 publications

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“…As further plans we would like also to mention the variety of rich RKKY-related physics in bilayer graphene [31]. Taking into account that interaction effects might be also important in bilayer graphene [32], similar calculations for it are in our plans for future work.…”

Section: Discussionmentioning

confidence: 94%

Interelectron interactions and the RKKY potential between H adatoms in graphene

et al. 2017

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We use first-principles Quantum Monte-Carlo simulations to study the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between hydrogen adatoms attached to a graphene sheet. We find that the pairwise RKKY interactions at distances of a few lattice spacings are strongly affected by inter-electron interactions, in particular, the potential barrier between widely separated adatoms and the dimer configuration becomes wider and thus harder to penetrate. We also point out that anti-ferrromagnetic and charge density wave orderings have very different effects on the RKKY interaction. Finally, we analyze the stability of several regular adatom superlattices with respect to small displacements of a single adatom, distinguishing the cases of adatoms which populate either both or only one sublattice of the graphene lattice.

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Section: Discussionmentioning

confidence: 94%

Interelectron interactions and the RKKY potential between H adatoms in graphene

et al. 2017

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“…The discovery of such a system in the late 1980s 16,17 opened the possibility of developing new devices, highlighting the relevance of the control of the exchange coupling, for example by choosing the properties of the Fermi surface of the spacer [18][19][20] . Other realizations of voltage-controlled systems include nuclear spins 21 , magnetic dimers between electrodes 22 , two-dimensional materials [23][24][25][26][27][28] , and ultrathin Co films [29][30][31] . Magnetization can be induced in platinum at metal|dielectric interfaces 32 .…”

Section: Introductionmentioning

confidence: 99%

Manipulation of the RKKY exchange by voltages

et al. 2019

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In the last years, electric fields have been used to control the magnetic exchange interactions and anisotropies in nanometric devices. In this work, we study the spin-spin exchange interaction between two magnetic impurities embedded in a three-dimensional non-relativistic electron gas, namely the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction. The gas is confined in an insulating structure, and an applied voltage produces local changes in the electron density, which modulates the Fermi level of the system. Using a simple model, we demonstrate that this voltage modifies the strength and wavelength of the coupling between the impurities. Depending on the voltage, the effective RKKY exchange can change from a ferro-to an antiferromagnetic coupling, and vice versa. The spin-spin coupling can also be switched on and off by the voltage.

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“…Manipulation of the RKKY interaction is also possible through materials engineering of magnetic multilayers, where the interlayer interaction is predominantly due to RKKY coupling [25,26]. An applied static electric field [27][28][29][30][31] could also provide a means to control the RKKY interaction in materials and structures with considerable spin-orbit coupling [11,12,32,33].…”

Section: Introductionmentioning

confidence: 99%

Nonequilibrium RKKY interaction in irradiated graphene

Modi

Asmar

Tse

2020

Phys. Rev. Research

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We demonstrate that the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in graphene can be strongly modified by a time-periodic driving field even in the weak drive regime. This effect is due to the opening of a dynamical band gap at the Dirac points when graphene is exposed to circularly polarized light. Using Keldysh-Floquet Green's functions, we develop a theoretical framework to calculate the time-averaged RKKY coupling under weak periodic drives, and we show that its magnitude in undoped graphene can be decreased controllably by increasing the driving strength, while mostly maintaining its ferromagnetic or antiferromagnetic character. In doped graphene, we find RKKY oscillations with a period that is tunable by the driving field. When a sufficiently strong drive is turned on that brings the Fermi level completely within the dynamically opened gap, the behavior of the RKKY coupling changes qualitatively from that of doped to undoped irradiated graphene.

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Electrical control of the RKKY interaction in bilayer graphene

Cited by 14 publications

References 36 publications

Interelectron interactions and the RKKY potential between H adatoms in graphene

Interelectron interactions and the RKKY potential between H adatoms in graphene

Manipulation of the RKKY exchange by voltages

Nonequilibrium RKKY interaction in irradiated graphene

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