skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

This content will become publicly available on July 8, 2020

Title: Interlayer RKKY coupling in bulk Rashba semiconductors under topological phase transition

Abstract

The bulk Rashba semiconductors BiTeX (X=I, Cl and Br) with intrinsically enhanced Rashba spin-orbit coupling provide a new platform for investigation of spintronic and magnetic phenomena in materials. We theoretically investigate the interlayer exchange interaction between two ferromagnets deposited on opposite surfaces of a bulk Rashba semiconductor BiTeI in its trivial and topological insulator phases. In the trivial phase BiTeI, we find that for ferromagnets with a magnetization orthogonal to the interface, the exchange coupling is reminiscent of that of a conventional three-dimensional metal. Remarkably, ferromagnets with a magnetization parallel to the interface display a magnetic exchange qualitatively different from that of conventional three-dimensional metal due to the spin-orbit coupling. In this case, the interlayer exchange interaction acquires two periods of oscillations and decays as the inverse of the thickness of the BiTeI layer. For topological BiTeI, the magnetic exchange interaction becomes mediated only by the helical surface states and acts between the one-dimensional spin chains at the edges of the sample. The surface state-mediated interlayer exchange interaction allows for the coupling of ferromagnets with non-collinear magnetization and displays a decay power different from that of trivial BiTeI, allowing the detection of the topological phase transition in this material. Ourmore » work provides insights into the magnetic properties of these newly discovered materials and their possible functionalization.« less

Authors:
 [1];  [1]
  1. Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics and Astronomy
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1531164
Grant/Contract Number:  
SC0019326
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 1; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Asmar, Mahmoud M., and Tse, Wang-Kong. Interlayer RKKY coupling in bulk Rashba semiconductors under topological phase transition. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.014410.
Asmar, Mahmoud M., & Tse, Wang-Kong. Interlayer RKKY coupling in bulk Rashba semiconductors under topological phase transition. United States. doi:10.1103/PhysRevB.100.014410.
Asmar, Mahmoud M., and Tse, Wang-Kong. Mon . "Interlayer RKKY coupling in bulk Rashba semiconductors under topological phase transition". United States. doi:10.1103/PhysRevB.100.014410.
@article{osti_1531164,
title = {Interlayer RKKY coupling in bulk Rashba semiconductors under topological phase transition},
author = {Asmar, Mahmoud M. and Tse, Wang-Kong},
abstractNote = {The bulk Rashba semiconductors BiTeX (X=I, Cl and Br) with intrinsically enhanced Rashba spin-orbit coupling provide a new platform for investigation of spintronic and magnetic phenomena in materials. We theoretically investigate the interlayer exchange interaction between two ferromagnets deposited on opposite surfaces of a bulk Rashba semiconductor BiTeI in its trivial and topological insulator phases. In the trivial phase BiTeI, we find that for ferromagnets with a magnetization orthogonal to the interface, the exchange coupling is reminiscent of that of a conventional three-dimensional metal. Remarkably, ferromagnets with a magnetization parallel to the interface display a magnetic exchange qualitatively different from that of conventional three-dimensional metal due to the spin-orbit coupling. In this case, the interlayer exchange interaction acquires two periods of oscillations and decays as the inverse of the thickness of the BiTeI layer. For topological BiTeI, the magnetic exchange interaction becomes mediated only by the helical surface states and acts between the one-dimensional spin chains at the edges of the sample. The surface state-mediated interlayer exchange interaction allows for the coupling of ferromagnets with non-collinear magnetization and displays a decay power different from that of trivial BiTeI, allowing the detection of the topological phase transition in this material. Our work provides insights into the magnetic properties of these newly discovered materials and their possible functionalization.},
doi = {10.1103/PhysRevB.100.014410},
journal = {Physical Review B},
number = 1,
volume = 100,
place = {United States},
year = {2019},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on July 8, 2020
Publisher's Version of Record

Save / Share:

Works referenced in this record:

Spin Splitting of an Au(111) Surface State Band Observed with Angle Resolved Photoelectron Spectroscopy
journal, October 1996


Colloquium: Topological insulators
journal, November 2010


Z2 Topological Order and the Quantum Spin Hall Effect
journal, September 2005