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Title: Formation of quantum spin Hall state on Si surface and energy gap scaling with strength of spin orbit coupling

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep07102· OSTI ID:1213478
 [1];  [1];  [1];  [1];  [2];  [3]
  1. Univ. of Utah, Salt Lake City, UT (United States)
  2. Beijing Institute of Technology, Beijing (China)
  3. Univ. of Utah, Salt Lake City, UT (United States); Collaborative Innovation Center of Quantum Matter, Beijing (China)

For potential applications in spintronics and quantum computing, it is desirable to place a quantum spin Hall insulator [i.e., a 2D topological insulator (TI)] on a substrate while maintaining a large energy gap. Here, we demonstrate a unique approach to create the large-gap 2D TI state on a semiconductor surface, based on first-principles calculations and effective Hamiltonian analysis. We show that when heavy elements with strong spin orbit coupling (SOC) such as Bi and Pb atoms are deposited on a patterned H-Si(111) surface into a hexagonal lattice, they exhibit a 2D TI state with a large energy gap of ≥0.5 eV. The TI state arises from an intriguing substrate orbital filtering effect that selects a suitable orbital composition around the Fermi level, so that the system can be matched onto a four-band effective model Hamiltonian. Furthermore, it is found that within this model, the SOC gap does not increase monotonically with the increasing strength of SOC. These interesting results may shed new light in future design and fabrication of large-gap topological quantum states.

Research Organization:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-04ER46148
OSTI ID:
1213478
Journal Information:
Scientific Reports, Vol. 4; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 71 works
Citation information provided by
Web of Science

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Cited By (32)

Computational design of two-dimensional topological materials: Two-dimensional topological materials journal March 2017
Quantum Spin Hall States in Stanene/Ge(111) journal September 2015
Unexpected Giant-Gap Quantum Spin Hall Insulator in Chemically Decorated Plumbene Monolayer journal February 2016
Exploring Ag(111) Substrate for Epitaxially Growing Monolayer Stanene: A First-Principles Study journal July 2016
First-principles prediction of a giant-gap quantum spin Hall insulator in Pb thin film journal January 2016
Evolution of the topological properties of two-dimensional group IVA materials and device design journal January 2018
Formation of a large gap quantum spin Hall phase in a 2D trigonal lattice with three p-orbitals journal January 2018
Quantum anomalous/valley Hall effect and tunable quantum state in hydrogenated arsenene decorated with a transition metal journal January 2018
Nontrivial topology and topological phase transition in two-dimensional monolayer Tl journal January 2018
Topological phase transition induced by p x,y and p z band inversion in a honeycomb lattice journal January 2019
Prediction of two-dimensional organic topological insulator in metal-DCB lattices journal December 2018
Topological phases in two-dimensional materials: a review journal May 2016
Interplay between spin–orbit coupling and crystal-field effect in topological insulators journal June 2015
Formation of a quantum spin Hall state on a Ge(111) surface journal January 2016
Electronic properties of the two-dimensional (Tl, Rb)/Si(1 1 1)$\boldsymbol{\sqrt3 \times \sqrt3}$ compound having a honeycomb-like structure journal September 2018
Atomic, electronic and transport properties of In–Au 2D compound on Si(1 0 0) journal January 2020
The nontrivial electronic structure of Bi/Sb honeycombs on SiC(0001) journal February 2015
Strain-engineered electronic and topological properties of bismuthene on SiC(0001) substrate journal October 2019
From DFT to machine learning: recent approaches to materials science–a review journal May 2019
Controlling spin polarization of a quantum dot via a helical edge state journal July 2015
Prediction of two-dimensional topological insulator by forming a surface alloy on Au/Si(111) substrate journal January 2016
Quantum thermal transport in stanene journal July 2016
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Strain-Induced Quantum Spin Hall Effect in Two-Dimensional Methyl-Functionalized Silicene SiCH3 journal September 2018
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