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Orbital-selective spin texture and its manipulation in a topological insulator.

Abstract：

:Topological insulators represent a new quantum state of matter that are insulating in the bulk but metallic on the edge or surface. In the Dirac surface state, it is well-established that the electron spin is locked with the crystal momentum. Here we report a new phenomenon of the spin texture locking with the orbital texture in a topological insulator Bi₂Se₃. We observe light-polarization-dependent spin texture of both the upper and lower Dirac cones that constitutes strong evidence of the orbital-dependent spin texture in Bi₂Se₃. The different spin texture detected in variable polarization geometry is the manifestation of the spin-orbital texture in the initial state combined with the photoemission matrix element effects. Our observations provide a new orbital degree of freedom and a new way of light manipulation in controlling the spin structure of the topological insulators that are important for their future applications in spin-related technologies.

journal_name

Nat Commun

journal_title

Nature communications

authors

Xie Z,He S,Chen C,Feng Y,Yi H,Liang A,Zhao L,Mou D,He J,Peng Y,Liu X,Liu Y,Liu G,Dong X,Yu L,Zhang J,Zhang S,Wang Z,Zhang F,Yang F,Peng Q,Wang X,Chen C,Xu Z,Zhou XJ

doi

10.1038/ncomms4382

subject

Has Abstract

pub_date

2014-02-28 00:00:00

pages

3382

issn

2041-1723

pii

ncomms4382

journal_volume

5

pub_type

杂志文章

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