期刊
PHYSICAL REVIEW LETTERS
卷 118, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.116401
关键词
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资金
- Cologne University via the Advanced Postdoc Grant 2D materials beyond graphene
- Bonn-Cologne Graduate School (BCGS)
- DAAD/MZOS-project Two-dimensional materials with novel properties
- Israel Science Foundation [1243/13]
- Marie Curie CIG Grant [618188]
- DFG [BU2197/4-1, SPP 1459]
- Unity Through Knowledge Fund [22/15]
- H CSA Twinning Project [692194]
We present direct experimental evidence of broken chirality in graphene by analyzing electron scattering processes at energies ranging from the linear (Dirac-like) to the strongly trigonally warped region. Furthermore, we are able to measure the energy of the van Hove singularity at the M point of the conduction band. Our data show a very good agreement with theoretical calculations for free-standing graphene. We identify a new intravalley scattering channel activated in case of a strongly trigonally warped constant energy contour, which is not suppressed by chirality. Finally, we compare our experimental findings with T-matrix simulations with and without the presence of a pseudomagnetic field and suggest that higher order electron hopping effects are a key factor in breaking the chirality near to the van Hove singularity.
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