Study of the indirect interaction in the quantum dots of the graphene bilayer in the framework of the s-d model

Белоненко, М. Б.; Лебедев, Н. Г.; Pak, A. V.

doi:10.1134/s1063785011080049

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…A number of studies have looked at magnetic interactions in graphene systems with geometries other than the standard two-dimensional sheets considered so far in this work. These include nanotubes [47][48][49][50]82,83], nanoribbons [58,63,65,66,84,85], nanoflakes [87] and multilayer graphene systems [59,[88][89][90][91]. Quasi-one-dimensional graphene systems, such as nanotubes and nanoribbons, are expected to display longer ranged interactions than those present in two-dimensional graphene sheets.…”

Section: Geometry Effectsmentioning

confidence: 99%

“…A recent work by Klinovaja and Loss extends the study of the interaction in one-dimensional graphenes to include spin-orbit interactions [86]. The RKKY interaction has been studied in bilayer graphene systems by several authors [59,[88][89][90]. The quadratic nature of the dispersion relation in bilayers means that many of the features present in monolayer graphene are removed.…”

Section: Geometry Effectsmentioning

confidence: 99%

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Indirect Exchange and Ruderman–Kittel–Kasuya–Yosida (RKKY) Interactions in Magnetically-Doped Graphene

Power

Ferreira

2013

Crystals

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Magnetically-doped graphene systems are potential candidates for application in future spintronic devices. A key step is to understand the pairwise interactions between magnetic impurities embedded in graphene that are mediated by the graphene conduction electrons. A large number of studies have been undertaken to investigate the indirect exchange, or RKKY (Ruderman-Kittel-Kasuya-Yosida), interactions in graphene. Many of these studies report a decay rate faster than expected for a two-dimensional material and the absence of the usual distance dependent oscillations. In this review we summarize the techniques used to calculate the interaction and present the key results obtained to date. The effects of more detailed parameterisations of the magnetic impurities and graphene host are considered, as are results obtained from ab initio calculations. Since the fast decay of the interaction presents an obstacle to spintronic applications, we focus in particular on the possibility of augmenting the interaction range by a number of methods including doping, spin precession and the application of strain.

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Section: Geometry Effectsmentioning

confidence: 99%

Section: Geometry Effectsmentioning

confidence: 99%

Indirect Exchange and Ruderman–Kittel–Kasuya–Yosida (RKKY) Interactions in Magnetically-Doped Graphene

Power

Ferreira

2013

Crystals

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“…Как было продемонстрировано ранее в работах [33], в синглетном состоянии зависимости фундаментальных параметров от длины ук-УНТ (0,9) имеют монотонный характер. Потенциал ионизации монотонно уменьшается с длиной и находится в интервале IP = 5.02-7.56 эВ и 5.12-7.56…”

Section: результаты расчетов электронной структуры чистых нанотрубкахunclassified

“…Инверсия спиновой поляризации наблюдается для комплекса с числом сегментов i = 7. Эффект инверсии спиновой поляризации наблюдался и описывался для чистых ук-УНТ (0,9) в сильном электрическом поле [33]. Увеличение спиновой поляризации для спина вниз наблюдается только на сегментах n = 2,3, что так же, как и в случае аниона, определяет перспективы в контролирование спиновой поляризации на маленьком количестве сегментов.…”

Section: результаты расчетов электронной структуры чистых нанотрубкахunclassified

Модуляция Электронной Структуры Ультракороткой Углеродной Нанотрубки (0,9) При Легировании Щелочными Металлами

Тучин¹,

Глушков²,

Бормонтов³

2017

kcmf

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Аннотация: В работе установлено, что в узком интервале длин в металлических трубках (0,9) не выполняется правило 3k, существует ненулевая запрещенная зона, и трубки становятся полупроводниковыми. Энергетический зазор между граничными орбиталями в триплетном состоянии зависит от спина, поэтому проводимость трубки спинзависима, что обуславливает перспективу использования ук-УНТ в устройствах со спиновым транспортом. Ширина запрещенной зоны убывает при дискретном наращивании длин трубки. Контролируемое введение металлической примеси приводит к модуляции запрещенной зоны, росту проводимости и спиновой поляризации в случае анионных комплексов. Таким образом, показан технологический способ управления свойствами материала для создания функциональных устройств спинтроники.Ключевые слова: спин, спинтроника, углеродная нанотрубка, допирование, щелочные металлы. Abstract:The main task for modern spintronics is to fi nd materials with high spin polarization that enable spin transport. Carbon nanomaterials are under special focus, including ultra-short carbon nanotubes (us-CNTs) which are thermodynamically stable and have high spin polarization. Synthesis methods for us-CNTs with a narrow distribution of the tube length and chirality have recently been developed. The paper describes a numerical simulation experiment that was carried out by means of the method based on density functional theory. Its goal was to calculate the main electron structure parameters of alkali-metal doped us-CNTs to determine the conditions of intrinsic spin polarization. It was established that in a close interval the 3k-rule does not work for metal tubes (0,9). There is a non-zero gap between the frontier molecular orbitals and the tube acts as a semiconductor. The gap between the highest occupied and the lowest unoccupied molecular orbitals depends on electron spin at the triplet state, thus the conductivity is spin-dependent, which makes it possible to use us-CNTs to construct transport devices. The energy gap decreases with an increase in tube length. The controlled alkali metal doping modulates the energy gap that leads to the increase in conductivity and spin polarization in case of anion complexes. Thus, the paper describes a technological way to modify the properties of us-CNTs to create functional spintronic devices.

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Study of the indirect exchange interaction in a strained graphene nanoribbon

Жуков

Bouffanais

Pak

et al. 2013

Physica B: Condensed Matter

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Study of the indirect interaction in the quantum dots of the graphene bilayer in the framework of the s-d model

Cited by 3 publications

References 8 publications

Indirect Exchange and Ruderman–Kittel–Kasuya–Yosida (RKKY) Interactions in Magnetically-Doped Graphene

Indirect Exchange and Ruderman–Kittel–Kasuya–Yosida (RKKY) Interactions in Magnetically-Doped Graphene

Модуляция Электронной Структуры Ультракороткой Углеродной Нанотрубки (0,9) При Легировании Щелочными Металлами

Study of the indirect exchange interaction in a strained graphene nanoribbon

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