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Current-induced Orbital and Spin Magnetizations in Crystals with Helical Structure.

Yoda T, Yokoyama T, Murakami S - Sci Rep (2015)

Bottom Line: The induced magnetizations are opposite for right-handed and left-handed helices.The current-induced spin magnetization along the helical axis comes from a radial spin texture on the Fermi surface.This is in sharp contrast to Rashba systems where the induced spin magnetization is perpendicular to the applied current.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.

ABSTRACT
We theoretically show that in a crystal with a helical lattice structure, orbital and spin magnetizations along a helical axis are induced by an electric current along the helical axis. We propose a simple tight-binding model for calculations, and the results can be generalized to any helical crystals. The induced magnetizations are opposite for right-handed and left-handed helices. The current-induced spin magnetization along the helical axis comes from a radial spin texture on the Fermi surface. This is in sharp contrast to Rashba systems where the induced spin magnetization is perpendicular to the applied current.

No MeSH data available.


Related in: MedlinePlus

Helical lattice structure of the present model.a One layer of the model, forming a honeycomb lattice. Dashed arrows denote vectors b1, b2, and b3. b Hopping texture in the right-handed helix. c Hopping texture in the left-handed helix. Red (blue) lines denote hoppings between A (B) sites.
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f1: Helical lattice structure of the present model.a One layer of the model, forming a honeycomb lattice. Dashed arrows denote vectors b1, b2, and b3. b Hopping texture in the right-handed helix. c Hopping texture in the left-handed helix. Red (blue) lines denote hoppings between A (B) sites.

Mentions: First, we consider an orbital magnetization in a helical crystal. Here, we introduce a three-dimensional tight-binding model with a right- or left-handed helical structures. The lattice structure of this model is composed of an infinite stack of honeycomb lattice layers with one orbital per site. We consider the honeycomb lattice as shown in Fig.1a, with , , and b3 = −b1 − b2, where a is a constant. The layers are stacked along the z-direction with the primitive lattice vector , where c is the interlayer spacing. The Hamiltonian is


Current-induced Orbital and Spin Magnetizations in Crystals with Helical Structure.

Yoda T, Yokoyama T, Murakami S - Sci Rep (2015)

Helical lattice structure of the present model.a One layer of the model, forming a honeycomb lattice. Dashed arrows denote vectors b1, b2, and b3. b Hopping texture in the right-handed helix. c Hopping texture in the left-handed helix. Red (blue) lines denote hoppings between A (B) sites.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4496783&req=5

f1: Helical lattice structure of the present model.a One layer of the model, forming a honeycomb lattice. Dashed arrows denote vectors b1, b2, and b3. b Hopping texture in the right-handed helix. c Hopping texture in the left-handed helix. Red (blue) lines denote hoppings between A (B) sites.
Mentions: First, we consider an orbital magnetization in a helical crystal. Here, we introduce a three-dimensional tight-binding model with a right- or left-handed helical structures. The lattice structure of this model is composed of an infinite stack of honeycomb lattice layers with one orbital per site. We consider the honeycomb lattice as shown in Fig.1a, with , , and b3 = −b1 − b2, where a is a constant. The layers are stacked along the z-direction with the primitive lattice vector , where c is the interlayer spacing. The Hamiltonian is

Bottom Line: The induced magnetizations are opposite for right-handed and left-handed helices.The current-induced spin magnetization along the helical axis comes from a radial spin texture on the Fermi surface.This is in sharp contrast to Rashba systems where the induced spin magnetization is perpendicular to the applied current.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.

ABSTRACT
We theoretically show that in a crystal with a helical lattice structure, orbital and spin magnetizations along a helical axis are induced by an electric current along the helical axis. We propose a simple tight-binding model for calculations, and the results can be generalized to any helical crystals. The induced magnetizations are opposite for right-handed and left-handed helices. The current-induced spin magnetization along the helical axis comes from a radial spin texture on the Fermi surface. This is in sharp contrast to Rashba systems where the induced spin magnetization is perpendicular to the applied current.

No MeSH data available.


Related in: MedlinePlus