Integrating superconducting phase and topological crystalline quantum spin Hall effect in hafnium intercalated gallium film
Abstract
Here, motivated by the growth of superconducting atomic hexagonal Ga layers on GaN surface we have calculated the electronic properties of Hf intercalated honeycomb Ga layers using first-principles theory. In contrast to the hexagonal Ga layers where substrate is necessary for their stability, we find the above structure to be dynamically stable in its freestanding form with small formation energy. In particular, six Dirac cones composed of Hf-dxy/dx2-y2 orbitals are observed in the first Brillouin zone, slightly below the Fermi energy. Spin-orbit coupling opens a large band gap of 177 meV on these Dirac cones. By calculating its mirror Chern number, we demonstrate that this band gap is topologically nontrivial and protected by mirror symmetry. Such mirror symmetry protected band gaps are rare in hexagonal lattice. A large topological crystalline quantum spin Hall conductance σSH ~–4 e2/h is also revealed. Moreover, electron-phonon coupling calculations reveal that this material is superconducting with a transition temperature Tc = 2.4 K, mainly contributed by Ga out-of-plane vibrations. Our results provide a route toward manipulating quantum spin Hall and superconducting behaviors in a single material which helps to realize Majorana fermions and topological superconductors.
- Authors:
-
- Virginia Commonwealth Univ., Richmond, VA (United States)
- Peking Univ., Beijing (China)
- Peking Univ., Beijing (China); Virginia Commonwealth Univ., Richmond, VA (United States)
- Publication Date:
- Research Org.:
- Virginia Commonwealth Univ., Richmond, VA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1467580
- Alternate Identifier(s):
- OSTI ID: 1258325
- Grant/Contract Number:
- FG02-96ER45579; FG02-11ER46827
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 108; Journal Issue: 25; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Zhou, Jian, Zhang, Shunhong, Wang, Qian, and Jena, Puru. Integrating superconducting phase and topological crystalline quantum spin Hall effect in hafnium intercalated gallium film. United States: N. p., 2016.
Web. doi:10.1063/1.4954672.
Zhou, Jian, Zhang, Shunhong, Wang, Qian, & Jena, Puru. Integrating superconducting phase and topological crystalline quantum spin Hall effect in hafnium intercalated gallium film. United States. https://doi.org/10.1063/1.4954672
Zhou, Jian, Zhang, Shunhong, Wang, Qian, and Jena, Puru. Mon .
"Integrating superconducting phase and topological crystalline quantum spin Hall effect in hafnium intercalated gallium film". United States. https://doi.org/10.1063/1.4954672. https://www.osti.gov/servlets/purl/1467580.
@article{osti_1467580,
title = {Integrating superconducting phase and topological crystalline quantum spin Hall effect in hafnium intercalated gallium film},
author = {Zhou, Jian and Zhang, Shunhong and Wang, Qian and Jena, Puru},
abstractNote = {Here, motivated by the growth of superconducting atomic hexagonal Ga layers on GaN surface we have calculated the electronic properties of Hf intercalated honeycomb Ga layers using first-principles theory. In contrast to the hexagonal Ga layers where substrate is necessary for their stability, we find the above structure to be dynamically stable in its freestanding form with small formation energy. In particular, six Dirac cones composed of Hf-dxy/dx2-y2 orbitals are observed in the first Brillouin zone, slightly below the Fermi energy. Spin-orbit coupling opens a large band gap of 177 meV on these Dirac cones. By calculating its mirror Chern number, we demonstrate that this band gap is topologically nontrivial and protected by mirror symmetry. Such mirror symmetry protected band gaps are rare in hexagonal lattice. A large topological crystalline quantum spin Hall conductance σSH ~–4 e2/h is also revealed. Moreover, electron-phonon coupling calculations reveal that this material is superconducting with a transition temperature Tc = 2.4 K, mainly contributed by Ga out-of-plane vibrations. Our results provide a route toward manipulating quantum spin Hall and superconducting behaviors in a single material which helps to realize Majorana fermions and topological superconductors.},
doi = {10.1063/1.4954672},
journal = {Applied Physics Letters},
number = 25,
volume = 108,
place = {United States},
year = {Mon Jun 20 00:00:00 EDT 2016},
month = {Mon Jun 20 00:00:00 EDT 2016}
}
Web of Science
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Works referencing / citing this record:
The structure and superconductivity of ultrathin Ga films on GaN substrate: A first-principles calculations
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