Quantum confinement and heavy surface states of Dirac fermions in bismuth (111) films: An analytical approach

2018 ◽  
Vol 97 (11) ◽  
Author(s):  
V. V. Enaldiev ◽  
V. A. Volkov
Keyword(s):  
Quantum Confinement ◽  
Analytical Approach ◽  
Surface States ◽  
Dirac Fermions

Topological Surface States of Dirac Fermions in n-Bi2Te3 –ySey Thermoelectrics

2019 ◽  
Vol 53 (5) ◽  
pp. 647-651
Author(s):  
L. N. Lukyanova ◽  
I. V. Makarenko ◽  
O. A. Usov ◽  
P. A. Dementev
Keyword(s):  
Surface States ◽  
Dirac Fermions ◽  
Topological Surface

scholarly journals Phase diagram of graphene nanoribbons and band-gap bifurcation of Dirac fermions under quantum confinement

2012 ◽  
Vol 85 (19) ◽  
Author(s):  
Y. Y. Sun ◽  
W. Y. Ruan ◽  
Xingfa Gao ◽  
Junhyeok Bang ◽  
Yong-Hyun Kim ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Band Gap ◽  
Quantum Confinement ◽  
Graphene Nanoribbons ◽  
Dirac Fermions

scholarly journals Recent progresses of quantum confinement in graphene quantum dots

2021 ◽  
Vol 17 (3) ◽  
Author(s):  
Si-Yu Li ◽  
Lin He
Keyword(s):  
Quantum Dots ◽  
Quantum Confinement ◽  
Bound States ◽  
Berry Phase ◽  
Graphene Quantum Dots ◽  
Bound State ◽  
Scanning Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Dirac Fermions ◽  
Tunneling Microscopy

AbstractGraphene quantum dots (GQDs) not only have potential applications on spin qubit, but also serve as essential platforms to study the fundamental properties of Dirac fermions, such as Klein tunneling and Berry phase. By now, the study of quantum confinement in GQDs still attract much attention in condensed matter physics. In this article, we review the experimental progresses on quantum confinement in GQDs mainly by using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). Here, the GQDs are divided into Klein GQDs, bound-state GQDs and edge-terminated GQDs according to their different confinement strength. Based on the realization of quasi-bound states in Klein GQDs, external perpendicular magnetic field is utilized as a manipulation approach to trigger and control the novel properties by tuning Berry phase and electron-electron (e-e) interaction. The tip-induced edge-free GQDs can serve as an intuitive mean to explore the broken symmetry states at nanoscale and single-electron accuracy, which are expected to be used in studying physical properties of different two-dimensional materials. Moreover, high-spin magnetic ground states are successfully introduced in edge-terminated GQDs by designing and synthesizing triangulene zigzag nanographenes.

scholarly journals Photoemission Spectroscopic Evidence of Multiple Dirac Cones in Superconducting BaSn3

2021 ◽  
Vol 38 (10) ◽  
pp. 107403
Author(s):  
Zhe Huang ◽  
Xianbiao Shi ◽  
Gaoning Zhang ◽  
Zhengtai Liu ◽  
Soohyun Cho ◽  
...  
Keyword(s):  
Surface States ◽  
Photoemission Spectroscopy ◽  
Rotational Axis ◽  
Type I ◽  
Dirac Fermions ◽  
First Principles Calculations ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Topological Quantum ◽  
Topological Surface ◽  
Single Material

Signatures of topological superconductivity (TSC) in superconducting materials with topological nontrivial states prompt intensive researches recently. Utilizing high-resolution angle-resolved photoemission spectroscopy and first-principles calculations, we demonstrate multiple Dirac fermions and surface states in superconductor BaSn3 with a critical transition temperature of about 4.4 K. We predict and then unveil the existence of two pairs of type-I topological Dirac fermions residing on the rotational axis. Type-II Dirac fermions protected by screw axis are confirmed in the same compound. Further calculation for the spin helical texture of the observed surface states originating from the Dirac fermions gives an opportunity for realization of TSC in one single material. Hosting multiple Dirac fermions and topological surface states, the intrinsic superconductor BaSn3 is expected to be a new platform for further investigation of topological quantum materials as well as TSC.

scholarly journals Fermi-crossing Type-II Dirac fermions and topological surface states in NiTe2

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Saumya Mukherjee ◽  
Sung Won Jung ◽  
Sophie F. Weber ◽  
Chunqiang Xu ◽  
Dong Qian ◽  
...  
Keyword(s):  
Surface States ◽  
Dirac Fermions ◽  
Type Ii ◽  
Topological Surface

Quantum-confinement-induced periodic surface states in two-dimensional metal-organic frameworks

2020 ◽  
Vol 117 (19) ◽  
pp. 191601
Author(s):  
Chun-Sheng Zhou ◽  
Xiang-Rui Liu ◽  
Yue Feng ◽  
Xiji Shao ◽  
Meng Zeng ◽  
...  
Keyword(s):  
Quantum Confinement ◽  
Metal Organic Frameworks ◽  
Surface States ◽  
Two Dimensional ◽  
Periodic Surface ◽  
Metal Organic

scholarly journals Термоэлектрические и гальваномагнитные свойства слоистых пленок n-Bi-=SUB=-2-x-=/SUB=-Sb-=SUB=-x-=/SUB=-Te-=SUB=-3-y-=/SUB=-Se-=SUB=-y-=/SUB=-

2019 ◽  
Vol 53 (5) ◽  
pp. 626
Author(s):  
Л.Н. Лукьянова ◽  
О.А. Усов ◽  
М.П. Волков
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Properties ◽  
Low Temperatures ◽  
Bulk Material ◽  
Surface States ◽  
Dirac Fermions ◽  
Thermoelectric Efficiency ◽  
Strong Magnetic Fields ◽  
Topological Surface ◽  
Magnetoresistance Oscillations

n nanostructured layered films of topological thermoelectrics n-Bi2−xSbxTe3−y Sey , thermoelectric properties in the temperature range of 4.2−300K and magnetoresistance oscillations in strong magnetic fields at low temperatures were studied. It is shown that thermoelectric efficiency in the layered n-Bi2−xSbxTe3−y Sey films increases as compared with bulk material due to both an increase in the Seebeck coefficient at the temperatures below room one, and a decrease in thermal conductivity and weakening of its temperature dependence. From the analysis of magnetoresistance oscillations, the parameters of topological surface states of Dirac fermions were determined and their influence on thermoelectric properties was estimated.

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