STM Imaging of Electronic Waves on the Surface ofBi2Te3: Topologically Protected Surface States and Hexagonal Warping Effects

This article presents a chemical description of a simple topological insulators model in order to translate concepts such as "symmetry protected", "surface states" to the chemistry vocabulary

Download Full-text

Raman response of topologically protected surface states in sub‐micrometric Pb 0.77 Sn 0.23 Se flakes

Journal of Raman Spectroscopy ◽

10.1002/jrs.5998 ◽

2020 ◽

Vol 51 (12) ◽

pp. 2489-2495

Author(s):

Sanaz Mehdipour ◽

David López‐Diaz ◽

María Mercedes Velázquez ◽

Pedro Hidalgo ◽

Bianchi Méndez ◽

...

Keyword(s):

Surface States ◽

Protected Surface ◽

Raman Response

Download Full-text

Polar and phase domain walls with conducting interfacial states in a Weyl semimetal MoTe2

Nature Communications ◽

10.1038/s41467-019-11949-5 ◽

2019 ◽

Vol 10 (1) ◽

Cited By ~ 7

Author(s):

Fei-Ting Huang ◽

Seong Joon Lim ◽

Sobhit Singh ◽

Jinwoong Kim ◽

Lunyong Zhang ◽

...

Keyword(s):

Domain Walls ◽

Surface States ◽

Scanning Tunneling ◽

Tunneling Microscopy ◽

Topological Materials ◽

Phase Domain ◽

Wall Structures ◽

Transmission Electron ◽

Interfacial States ◽

Protected Surface

Abstract Much of the dramatic growth in research on topological materials has focused on topologically protected surface states. While the domain walls of topological materials such as Weyl semimetals with broken inversion or time-reversal symmetry can provide a hunting ground for exploring topological interfacial states, such investigations have received little attention to date. Here, utilizing in-situ cryogenic transmission electron microscopy combined with first-principles calculations, we discover intriguing domain-wall structures in MoTe2, both between polar variants of the low-temperature(T) Weyl phase, and between this and the high-T higher-order topological phase. We demonstrate how polar domain walls can be manipulated with electron beams and show that phase domain walls tend to form superlattice-like structures along the c axis. Scanning tunneling microscopy indicates a possible signature of a conducting hinge state at phase domain walls. Our results open avenues for investigating topological interfacial states and unveiling multifunctional aspects of domain walls in topological materials.

Download Full-text

Evidence for Topologically Protected Surface States and a Superconducting Phase in[Tl4](Tl1−xSnx)Te3Using Photoemission, Specific Heat, and Magnetization Measurements, and Density Functional Theory

Physical Review Letters ◽

10.1103/physrevlett.112.017002 ◽

2014 ◽

Vol 112 (1) ◽

Cited By ~ 20

Author(s):

K. E. Arpino ◽

D. C. Wallace ◽

Y. F. Nie ◽

T. Birol ◽

P. D. C. King ◽

...

Keyword(s):

Density Functional Theory ◽

Specific Heat ◽

Density Functional ◽

Surface States ◽

Superconducting Phase ◽

Functional Theory ◽

Magnetization Measurements ◽

Protected Surface

Download Full-text

Robustness of Topologically Protected Surface States in Layering ofBi2Te3Thin Films

Physical Review Letters ◽

10.1103/physrevlett.105.186801 ◽

2010 ◽

Vol 105 (18) ◽

Cited By ~ 114

Author(s):

Kyungwha Park ◽

J. J. Heremans ◽

V. W. Scarola ◽

Djordje Minic

Keyword(s):

Surface States ◽

Protected Surface

Download Full-text

Topological surface states interacting with bulk excitations in the Kondo insulator SmB6 revealed via planar tunneling spectroscopy

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.1606042113 ◽

2016 ◽

Vol 113 (24) ◽

pp. 6599-6604 ◽

Cited By ~ 25

Author(s):

Wan Kyu Park ◽

Lunan Sun ◽

Alexander Noddings ◽

Dae-Jeong Kim ◽

Zachary Fisk ◽

...

Keyword(s):

Surface States ◽

Spectroscopic Properties ◽

Recent Theory ◽

Tunneling Conductance ◽

Strong Electron ◽

Kondo Insulator ◽

Single Crystal Surfaces ◽

Planar Tunneling ◽

Topological States ◽

Protected Surface

Samarium hexaboride (SmB6), a well-known Kondo insulator in which the insulating bulk arises from strong electron correlations, has recently attracted great attention owing to increasing evidence for its topological nature, thereby harboring protected surface states. However, corroborative spectroscopic evidence is still lacking, unlike in the weakly correlated counterparts, including Bi2Se3. Here, we report results from planar tunneling that unveil the detailed spectroscopic properties of SmB6. The tunneling conductance obtained on the (001) and (011) single crystal surfaces reveals linear density of states as expected for two and one Dirac cone(s), respectively. Quite remarkably, it is found that these topological states are not protected completely within the bulk hybridization gap. A phenomenological model of the tunneling process invoking interaction of the surface states with bulk excitations (spin excitons), as predicted by a recent theory, provides a consistent explanation for all of the observed features. Our spectroscopic study supports and explains the proposed picture of the incompletely protected surface states in this topological Kondo insulator SmB6.

Download Full-text