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Title: Giant tunable Rashba spin splitting in a two-dimensional BiSb monolayer and in BiSb/AlN heterostructures

Journal Article · · Physical Review B
 [1];  [1]
  1. West Virginia Univ., Morgantown, WV (United States)

The search for novel two-dimensional giant Rashba semiconductors is a crucial step in the development of the forth coming nanospintronic technology. Using first-principles calculations, we study a stable two-dimension alcrystal phase of BiSb having buckled honeycomb lattice geometry, which is yet unexplored. The phonon, room temperature molecular dynamics, and elastic constant calculations verify the dynamical and mechanical stability of the monolayer at 0 K and at room temperature. The calculated electronic band structure reveals the direct bandgap semiconducting nature of a BiSb monolayer with the presence of a highly mobile two-dimensional electron gas(2DEG) near the Fermi level. Inclusion of spin-orbit coupling yields the giant Rashba spin-splitting of a 2DEG near the Fermi level. The calculated Rashba energy and Rashba splitting constant are 13 meV and 2.3 eVÅ, respectively,which are amongst the largest yet known Rashba spin splitting parameters in 2D materials. In our work, we demonstrate that the strength of the Rashba spin splitting can be significantly tuned by applying in-plane biaxial strain on the BiSb monolayer. The presence of the giant Rashba spin splitting together with the large electronic band gap(1.6 eV) makes this system of peculiar interest for optoelectronics applications. Furthermore, we study the electronic properties of BiSb/AlN heterostructures having a lattice mismatch of 1.3% at the interface. Our results suggest that a BiSb monolayer and BiSb/AlN heterostructure systems could be potentially used to develop highly efficient spin field-effect transistors, optoelectronics, and nanospintronic devices. Thus, this comprehensive studyof two-dimensional BiSb systems can expand the range of possible applications in future spintronic technology.

Research Organization:
West Virginia Univ., Morgantown, WV (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
SC0016176; OCI-1053575; DMREF-NSF-1434897
OSTI ID:
1593756
Alternate ID(s):
OSTI ID: 1353133
Journal Information:
Physical Review B, Vol. 95, Issue 16; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 114 works
Citation information provided by
Web of Science

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Cited By (29)

2D V‐V Binary Materials: Status and Challenges journal August 2019
Switchable Out‐of‐Plane Polarization in 2D LiAlTe 2 journal March 2019
Bound Electron Pairs Formed by the Spin–Orbit Interaction in 2D Gated Structures journal April 2020
Rashba-like spin splitting along three momentum directions in trigonal layered PtBi2 journal October 2019
Theoretical discovery of novel two-dimensional V A -N binary compounds with auxiticity journal January 2018
Huge Rashba-type spin–orbit coupling in binary hexagonal PX nanosheets (X = As, Sb, and Bi) journal January 2018
Topologically nontrivial phase and tunable Rashba effect in half-oxidized bismuthene journal January 2019
Structure dependent optoelectronic properties of monolayer antimonene, bismuthene and their binary compound journal January 2019
Stable, one-dimensional suspended and supported monatomic chains of pnictogens: a metal–insulator framework journal January 2019
Halogenation of SiGe monolayers: robust changes in electronic and thermal transport journal January 2019
Band structure, phonon spectrum, and thermoelectric properties of β-BiAs and β-BiSb monolayers journal January 2020
Strain effect on electronic and lattice dynamical behaviour of two dimensional Bi, BiAs and BiSb conference January 2018
Understanding the behavior of electronic and phonon transports in germanium based two dimensional chalcogenides journal December 2018
Two-dimensional pnictogens: A review of recent progresses and future research directions journal June 2019
Van der Waals heterostructures of P, BSe, and SiC monolayers journal March 2019
Van der Waals heterostructures of blue phosphorene and scandium-based MXenes monolayers journal October 2019
Tunable giant Rashba-type spin splitting in PtSe 2 /MoSe 2 heterostructure journal November 2019
Biaxial tensile strain tuned up-and-down behavior on lattice thermal conductivity in β -AsP monolayer journal June 2018
Entanglement entropy and entanglement spectrum of Bi 1− x Sb x (1 1 1) bilayers journal February 2018
Switchable Rashba effect by dipole moment switching in an Ag 2 Te monolayer journal August 2018
First principles study of semihydrogenated graphene and topological insulator heterojunction journal June 2019
Two-dimensional hydrogenated buckled gallium arsenide: an ab initio study journal January 2020
New two-dimensional V-V binary compounds with a honeycomb-like structure: a first-principles study journal March 2018
Realization of versatile electronic, magnetic properties and new topological phases in hydrogenated bismuthene journal May 2019
Intrinsic persistent spin helix state in two-dimensional group-IV monochalcogenide M X monolayers ( M = Sn or Ge and X = S , Se, or Te) journal September 2019
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