Single crystalline electronic structure and growth mechanism of aligned square graphene sheets
APL Materials AIP Publishing 6:3 (2018) 036107
Author Correction: How to probe the spin contribution to momentum relaxation in topological insulators.
Nature communications (2018)
Abstract:
The original version of this Article contained an error in the spelling of the author Benjamin H. Williams, which was incorrectly given as Benjamin H. Willams. This has now been corrected in both the PDF and HTML versions of the Article.Observation of topological surface states and strong electron/hole imbalance in extreme magnetoresistance compound LaBi
Physical Review Materials American Physical Society (APS) 2:2 (2018) 024201
Topological surface state of α-Sn on InSb(001) as studied by photoemission
Physical Review B American Physical Society 97:7 (2018) 075101
Abstract:
We report on the electronic structure of the elemental topological semimetal α − Sn on InSb(001). High-resolution angle-resolved photoemission data allow us to observe the topological surface state (TSS) that is degenerate with the bulk band structure and show that the former is unaffected by different surface reconstructions. An unintentional p -type doping of the as-grown films was compensated by deposition of potassium or tellurium after the growth, thereby shifting the Dirac point of the surface state below the Fermi level. We show that, while having the potential to break time-reversal symmetry, iron impurities with a coverage of up to 0.25 monolayers do not have any further impact on the surface state beyond that of K or Te. Furthermore, we have measured the spin-momentum locking of electrons from the TSS by means of spin-resolved photoemission. Our results show that the spin vector lies fully in-plane, but it also has a finite radial component. Finally, we analyze the decay of photoholes introduced in the photoemission process, and by this gain insight into the many-body interactions in the system. Surprisingly, we extract quasiparticle lifetimes comparable to other topological materials where the TSS is located within a bulk band gap. We argue that the main decay of photoholes is caused by intraband scattering, while scattering into bulk states is suppressed due to different orbital symmetries of bulk and surface states.Surface Structure and Reconstructions of HgTe (111) Surfaces* * Supported by the National Key Research and Development Program of China under Grant Nos 2016YFA0301003 and 2016YFA0300403, and the National Natural Science Foundation of China under Grant Nos 11521404, 11634009, U1632102, 11504230, 11674222, 11574202, 11674226, 11574201 and U1632272.
Chinese Physics Letters IOP Publishing 35:2 (2018) 026802