New generation of two-dimensional spintronic systems realized by coupling of Rashba and Dirac fermions S. V. Eremeev, S. S. Tsirkin, I. A. Nechaev [et.al.]
Material type:
ArticleSubject(s): спинтроника | Дирака фермионы | Рашбы расщеплениеGenre/Form: статьи в журналах Online resources: Click here to access online
In:
Scientific Reports [Еlectronic resource] Vol. 5. P. 12819 (1-8)Abstract: Intriguing phenomena and novel physics predicted for two-dimensional (2D) systems formed by electrons in Dirac or Rashba states motivate an active search for new materials or combinations of the already revealed ones. Being very promising ingredients in themselves, interplaying Dirac and Rashba systems can provide a base for next generation of spintronics devices, to a considerable
extent, by mixing their striking properties or by improving technically significant characteristics of
each other. Here, we demonstrate that in BiTeI@PbSb2Te4 composed of a BiTeI trilayer on top of the
topological insulator (TI) PbSb2Te4 weakly- and strongly-coupled Dirac-Rashba hybrid systems are
realized. The coupling strength depends on both interface hexagonal stacking and trilayer-stacking
order. The weakly-coupled system can serve as a prototype to examine, e.g., plasmonic excitations,
frictional drag, spin-polarized transport, and charge-spin separation effect in multilayer helical
metals. In the strongly-coupled regime, within ~100 meV energy interval of the bulk TI projected
bandgap a helical state substituting for the TI surface state appears. This new state is characterized
by a larger momentum, similar velocity, and strong localization within BiTeI. We anticipate that our
findings pave the way for designing a new type of spintronics devices based on Rashba-Dirac coupled
systems.
Библиогр.: 30 назв.
Intriguing phenomena and novel physics predicted for two-dimensional (2D) systems formed by electrons in Dirac or Rashba states motivate an active search for new materials or combinations of the already revealed ones. Being very promising ingredients in themselves, interplaying Dirac and Rashba systems can provide a base for next generation of spintronics devices, to a considerable
extent, by mixing their striking properties or by improving technically significant characteristics of
each other. Here, we demonstrate that in BiTeI@PbSb2Te4 composed of a BiTeI trilayer on top of the
topological insulator (TI) PbSb2Te4 weakly- and strongly-coupled Dirac-Rashba hybrid systems are
realized. The coupling strength depends on both interface hexagonal stacking and trilayer-stacking
order. The weakly-coupled system can serve as a prototype to examine, e.g., plasmonic excitations,
frictional drag, spin-polarized transport, and charge-spin separation effect in multilayer helical
metals. In the strongly-coupled regime, within ~100 meV energy interval of the bulk TI projected
bandgap a helical state substituting for the TI surface state appears. This new state is characterized
by a larger momentum, similar velocity, and strong localization within BiTeI. We anticipate that our
findings pave the way for designing a new type of spintronics devices based on Rashba-Dirac coupled
systems.
There are no comments on this title.