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Title: Varying topological properties of two-dimensional honeycomb lattices composed of endohedral fullerenes

Journal Article · · Physical Review B
ORCiD logo [1];  [2];  [3];  [3];  [4];  [3]
  1. Univ. of Science and Technology of China, Anhui (China); Temple Univ., Philadelphia, PA (United States); Beijing Computational Science Research Center (China)
  2. Temple Univ., Philadelphia, PA (United States); Chinese Academy of Sciences (CAS), Beijing (China)
  3. Univ. of Science and Technology of China, Anhui (China)
  4. Temple Univ., Philadelphia, PA (United States)

Honeycomb lattices (HLs) have been widely explored for realization of massless Dirac quasiparticles and intriguing topological properties in both the quantum and classical regimes, with elemental and artificial atoms as the corresponding building blocks. Here we provide a demonstration showing that when the fullerene molecules of C28 are used as prototypical building blocks, stable two-dimensional (2D) HLs can also be achieved, with the structural, electronic, and topological properties tuned via proper atom encapsulation. Specifically, whereas a closely packed structure is preferred for the C28 lattice, honeycomb structures with different spacial symmetries are energetically favored for both the Bi@C28 and In@C28 endohedral fullerenes. In particular, Bi@C28-HL is revealed to be a quantum spin Hall insulator because of strong spin-orbit coupling effects in the f molecular orbitals, while In@C28-HL is a quantum valley Hall insulator resulting from mirror symmetry breaking. Here, the present study offers superatom-based platforms for realizing quantum spin Hall and quantum valley Hall effects in 2D systems, with distinctly enhanced tunability and robustness against atomic-scale imperfections.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Complex Materials from First Principles (CCM); Temple Univ., Philadelphia, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012575
OSTI ID:
1611876
Alternate ID(s):
OSTI ID: 1545477
Journal Information:
Physical Review B, Vol. 100, Issue 4; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

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