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 »
- Authors:
-
- 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)
- OSTI Identifier:
- 1531164
- Alternate Identifier(s):
- OSTI ID: 1546320
- 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. https://doi.org/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. https://doi.org/10.1103/PhysRevB.100.014410. https://www.osti.gov/servlets/purl/1531164.
@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}
}
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Figures / Tables:
FIG. 1: (a) BiTeI crystal structure. (b) Brillouin zone of BiTeI. (c) Fermi surface of BiTeI centred at the A point for EF > 0. (d) Outer portion of the Fermi surface with negative helicity electrons. (e) Inner portion of the Fermi surface with positive helicity electrons.
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