Integrating superconducting phase and topological crystalline quantum spin Hall effect in hafnium intercalated gallium film

Zhou, Jian; Zhang, Shunhong; Wang, Qian; Jena, Puru

doi:10.1063/1.4954672

Title: Integrating superconducting phase and topological crystalline quantum spin Hall effect in hafnium intercalated gallium film

Journal Article · Mon Jun 20 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4954672· OSTI ID:1467580

Zhou, Jian ^[1]; Zhang, Shunhong ^[2]; Wang, Qian ^[3]; Jena, Puru ^[1]

Virginia Commonwealth Univ., Richmond, VA (United States)
Peking Univ., Beijing (China)
Peking Univ., Beijing (China); Virginia Commonwealth Univ., Richmond, VA (United States)

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-d_xy/d_x2-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 σ_SH ~–4 e²/h is also revealed. Moreover, electron-phonon coupling calculations reveal that this material is superconducting with a transition temperature T_c = 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.

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Research Organization:: Virginia Commonwealth Univ., Richmond, VA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-96ER45579; FG02-11ER46827

OSTI ID:: 1467580

Alternate ID(s):: OSTI ID: 1258325

Journal Information:: Applied Physics Letters, Vol. 108, Issue 25; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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