| Publication Type |
pre-print |
| School or College |
College of Engineering |
| Department |
Materials Science & Engineering |
| Creator |
Liu, Feng |
| Other Author |
Zhou, Miao; Ming, Wenmei; Liu, Zheng; Wang, Zhengfei; Li, Ping |
| Title |
Epitaxial growth of large-gap quantum spin Hall insulator on semiconductor surface : The substrate orbital filtering effect |
| Date |
2014-01-01 |
| Description |
Formation of topological quantum phase on conventional semiconductor surface is of both scientific and technological interest. Here, we demonstrate epitaxial growth of 2D topological insulator, i.e. quantum spin Hall (QSH) state, on Si(111) surface with a large energy gap, based on first-principles calculations. We show that Si(111) surface functionalized with 1/3 monolayer of halogen atoms [Si(111)- √3 x √3 -X (X=Cl, Br, I)] exhibiting a trigonal superstructure, provides an ideal template for epitaxial growth of heavy metals, such as Bi, which self-assemble into a hexagonal lattice with high kinetic and thermodynamic stability. Most remarkably, the Bi overlayer is ‘atomically' bonded to but ‘electronically' decoupled from the underlying Si substrate, exhibiting isolated QSH state with an energy gap as large as ~ 0.8 eV. This surprising phenomenon is originated from an intriguing substrate orbital filtering effect, which critically select the orbital composition around the Fermi level leading to different topological phases. Particularly, the substrate-orbital-filtering effect converts the otherwise topologically trivial freestanding Bi lattice into a nontrivial phase; while the reverse is true for Au lattice. The underlying physical mechanism is generally applicable, opening a new and exciting avenue for exploration of large-gap topological surface/interface states. |
| Type |
Text |
| Publisher |
National Academy of Sciences |
| Volume |
111 |
| Issue |
40 |
| First Page |
14378 |
| Last Page |
14381 |
| Language |
eng |
| Bibliographic Citation |
Zhou, M., Ming, W., Liu, Z., Wang, Z., Li, P., & Liu, F. (2014). Epitaxial growth of large-gap quantum spin Hall insulator on semiconductor surface. Proceedings of the National Academy of Sciences of the United States of America, 111(40), 14378-81. |
| Rights Management |
(c) National Academy of Sciences ; Authors manuscript from Zhou, M., Ming, W., Liu, Z., Wang, Z., Li, P., & Liu, F. (2014). Epitaxial growth of large-gap quantum spin Hall insulator on semiconductor surface. Proceedings of the National Academy of Sciences of the United States of America, 111(40), 14378-81. doi:10.1073/pnas.1409701111 |
| Format Medium |
application/pdf |
| Format Extent |
1,167,993 bytes |
| Identifier |
uspace,19016 |
| ARK |
ark:/87278/s6gf43m5 |
| Setname |
ir_uspace |
| ID |
712723 |
| Reference URL |
https://collections.lib.utah.edu/ark:/87278/s6gf43m5 |
