Ultrahigh conductivity in Weyl semimetal NbAs nanobelts
File Type:
PDFItem Type:
Journal ArticleDate:
2019Author:
Access:
openAccessCitation:
Zhang, C., Ni, Z., Zhang, J., Yuan, X., Liu, Y., Zou, Y., Liao, Z., Du, Y., Narayan, A., Zhang, H., Gu, T., Zhu, X., Pi, L., Sanvito, S., Han, X., Zou, J., Shi, Y., Wan, X., Savrasov, S.Y. & Xiu, F., Ultrahigh conductivity in Weyl semimetal NbAs nanobelts, Nature Materials, 18, 5, 2019, 482 - 488Download Item:
Ultrahigh Conductivity - Nature.pdf (Published (author's copy) - Peer Reviewed) 503.7Kb
Abstract:
In two-dimensional (2D) systems, high mobility is typically achieved in low-carrier-density semiconductors and semimetals. Here, we discover that the nanobelts of Weyl semimetal NbAs maintain a high mobility even in the presence of a high sheet carrier density. We develop a growth scheme to synthesize single crystalline NbAs nanobelts with tunable Fermi levels. Owing to a large surface-to-bulk ratio, we argue that a 2D surface state gives rise to the high sheet carrier density, even though the bulk Fermi level is located near the Weyl nodes. A surface sheet conductance up to 5–100 S per □ is realized, exceeding that of conventional 2D electron gases, quasi-2D metal films, and topological insulator surface states. Corroborated by theory, we attribute the origin of the ultrahigh conductance to the disorder-tolerant Fermi arcs. The evidenced low-dissipation property of Fermi arcs has implications for both fundamental study and potential electronic applications.
Author's Homepage:
http://people.tcd.ie/sanvitosDescription:
PUBLISHED
Author: Sanvito, Stefano; Zhang, Cheng; Ni, Zhuoliang; Zhang, Jinglei; Yuan, Xiang; Liu, Yanwen; Zou, Yichao; Liao, Zhiming; Du, Yongping; Narayan, Awadhesh; Zhang, Hongming; Gu, Tiancheng; Zhu, Xuesong; Pi, Li; Han, Xiaodong; Zou, Jin; Shi, Yi; Wan, Xiangang; Savrasov, Sergey Y.; Xiu, Faxian
Type of material:
Journal ArticleCollections:
Series/Report no:
Nature Materials;18;
5;
Availability:
Full text availableKeywords:
Two-dimensional systems, Semiconductors, Semimetals, NbAsDOI:
http://dx.doi.org/10.1038/s41563-019-0320-9Licences: