期刊
PHYSICAL REVIEW B
卷 101, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.101.085142
关键词
-
资金
- National Science Foundation [DMR-1410480]
- Center for the Advancement of Topological Semimetals, an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) through the Ames Laboratory [DE-AC02-07CH11358]
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF4536]
- Swiss National Science Foundation [P2EZP2_175155, P400P2_183890]
- Spanish MINECO [FIS2016-80434-P]
- Fundacion Ramon Areces
- Maria de Maeztu Program for Units of Excellence in RD [MDM-2014-0377]
- Comunidad Autonoma de Madrid through the Nanomag COST-CM Program [S2018/NMT-4321]
- European Union [604391]
- CNPq [405107/2017-0]
- Barcelona Supercomputing Center [FI-2019-2-0007]
- Swiss National Science Foundation (SNF) [P400P2_183890, P2EZP2_175155] Funding Source: Swiss National Science Foundation (SNF)
The Kondo insulator SmB6 has emerged as a primary candidate for exotic quantum phases, due to the predicted formation of strongly correlated, low-velocity topological surface states and corresponding high Fermi-level density of states. However, measurements of the surface-state velocity in SmB6 differ by orders of magnitude, depending on the experimental technique used. Here we reconcile two techniques, scanning tunneling microscopy (STM) and angle-resolved photoemission spectroscopy (ARPES), by accounting for surface band bending on polar terminations. Using spatially resolved scanning tunneling spectroscopy, we measure a band shift of similar to 20 meV between full-Sm and half-Sm terminations, in qualitative agreement with our density-functional theory calculations of the surface charge density. Furthermore, we reproduce the apparent high-velocity surface states reported by ARPES by simulating their observed spectral function as an equal-weight average over the two band-shifted domains that we image by STM. Our results highlight the necessity of local measurements to address inhomogeneously terminated surfaces or fabrication techniques to achieve uniform termination for meaningful large-area surface measurements of polar crystals such as SmB6.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据