scholarly journals Surface states and quasiparticle interference in Bernal and rhombohedral graphite with and without trigonal warping

2021 ◽  
Vol 104 (15) ◽  
Author(s):  
Vardan Kaladzhyan ◽  
Sarah Pinon ◽  
Frédéric Joucken ◽  
Zhehao Ge ◽  
Eberth A. Quezada-Lopez ◽  
...  
Keyword(s):  
Surface States ◽  
Quasiparticle Interference ◽  
Trigonal Warping

scholarly journals Quasiparticle Interference ofC2-Symmetric Surface States in a LaOFeAs Parent Compound

2011 ◽  
Vol 106 (8) ◽  
Author(s):  
Xiaodong Zhou ◽  
Cun Ye ◽  
Peng Cai ◽  
Xiangfeng Wang ◽  
Xianhui Chen ◽  
...  
Keyword(s):  
Parent Compound ◽  
Surface States ◽  
Quasiparticle Interference ◽  
Symmetric Surface

scholarly journals Quasiparticle interference of surface states in the type-II Weyl semimetal WTe2

2017 ◽  
Vol 96 (16) ◽  
Author(s):  
Wenhan Zhang ◽  
Quansheng Wu ◽  
Lunyong Zhang ◽  
Sang-Wook Cheong ◽  
Alexey A. Soluyanov ◽  
...  
Keyword(s):  
Surface States ◽  
Type Ii ◽  
Quasiparticle Interference ◽  
Weyl Semimetal

scholarly journals Quasiparticle interference patterns in bilayer graphene with trigonal warping

2021 ◽  
Vol 104 (23) ◽  
Author(s):  
Vardan Kaladzhyan ◽  
Frédéric Joucken ◽  
Zhehao Ge ◽  
Eberth A. Quezada-Lopez ◽  
Takashi Taniguchi ◽  
...  
Keyword(s):  
Bilayer Graphene ◽  
Quasiparticle Interference ◽  
Trigonal Warping

scholarly journals Quasiparticle interference evidence of the topological Fermi arc states in chiral fermionic semimetal CoSi

2019 ◽  
Vol 5 (12) ◽  
pp. eaaw9485 ◽  
Author(s):  
Qian-Qian Yuan ◽  
Liqin Zhou ◽  
Zhi-Cheng Rao ◽  
Shangjie Tian ◽  
Wei-Min Zhao ◽  
...  
Keyword(s):  
Density Functional ◽  
Surface States ◽  
High Energy ◽  
Scanning Tunneling ◽  
Wide Energy Range ◽  
Tunneling Microscopy ◽  
Space Resolution ◽  
Fermi Arc ◽  
Quasiparticle Interference ◽  
High Space

Chiral fermions in solid state feature “Fermi arc” states, connecting the surface projections of the bulk chiral nodes. The surface Fermi arc is a signature of nontrivial bulk topology. Unconventional chiral fermions with an extensive Fermi arc traversing the whole Brillouin zone have been theoretically proposed in CoSi. Here, we use scanning tunneling microscopy/spectroscopy to investigate quasiparticle interference at various terminations of a CoSi single crystal. The observed surface states exhibit chiral fermion–originated characteristics. These reside on (001) and (011) but not (111) surfaces with p-rotation symmetry, spiral with energy, and disperse in a wide energy range from ~−200 to ~+400 mV. Owing to the high-energy and high-space resolution, a spin-orbit coupling–induced splitting of up to ~80 mV is identified. Our observations are corroborated by density functional theory and provide strong evidence that CoSi hosts the unconventional chiral fermions and the extensive Fermi arc states.

Zero-loss omega-filtered REM and RHEED on the new Zeiss 912

1991 ◽  
Vol 49 ◽  
pp. 616-617
Author(s):  
J.C.H. Spence ◽  
J. Mayer
Keyword(s):  
Electron Microscopy ◽  
Materials Science ◽  
Surface States ◽  
Ccd Camera ◽  
Dark Field ◽  
Ion Pump ◽  
Magnetic Imaging ◽  
Reflection Electron Microscopy ◽  
Diffraction Patterns ◽  
Large Background

The Zeiss 912 is a new fully digital, side-entry, 120 Kv TEM/STEM instrument for materials science, fitted with an omega magnetic imaging energy filter. Pumping is by turbopump and ion pump. The magnetic imaging filter allows energy-filtered images or diffraction patterns to be recorded without scanning using efficient parallel (area) detection. The energy loss intensity distribution may also be displayed on the screen, and recorded by scanning it over the PMT supplied. If a CCD camera is fitted and suitable new software developed, “parallel ELS” recording results. For large fields of view, filtered images can be recorded much more efficiently than by Scanning Reflection Electron Microscopy, and the large background of inelastic scattering removed. We have therefore evaluated the 912 for REM and RHEED applications. Causes of streaking and resonance in RHEED patterns are being studied, and a more quantitative analysis of CBRED patterns may be possible. Dark field band-gap REM imaging of surface states may also be possible.

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