scholarly journals Investigations of proximity-induced superconductivity in the topological insulator Bi2Te3 by microRaman spectroscopy

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
D. Kiphart ◽  
Y. Harkavyi ◽  
K. Balin ◽  
J. Szade ◽  
B. Mróz ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Charge Transport ◽  
Topological Insulator ◽  
Superconducting State ◽  
High Temperature Superconductor ◽  
Superconducting Gap ◽  
Pseudogap State ◽  
Hybrid Device ◽  
Higher Temperature ◽  
Microraman Spectroscopy

AbstractWe used the topological insulator (TI) Bi2Te3 and a high-temperature superconductor (HTSC) hybrid device for investigations of proximity-induced superconductivity (PS) in the TI. Application of the superconductor YBa2Cu3O7-δ (YBCO) enabled us to access higher temperature and energy scales for this phenomenon. The HTSC in the hybrid device exhibits emergence of a pseudogap state for T > Tc that converts into a superconducting state with a reduced gap for T < Tc. The conversion process has been reflected in Raman spectra collected from the TI. Complementary charge transport experiments revealed emergence of the proximity-induced superconducting gap in the TI and the reduced superconducting gap in the HTSC, but no signature of the pseudogap. This allowed us to conclude that Raman spectroscopy reveals formation of the pseudogap state but cannot distinguish the proximity-induced superconducting state in the TI from the superconducting state in the HTSC characterised by the reduced gap. Results of our experiments have shown that Raman spectroscopy is a complementary technique to classic charge transport experiments and is a powerful tool for investigation of the proximity-induced superconductivity in the Bi2Te3.

scholarly journals Controllable quantum point junction on the surface of an antiferromagnetic topological insulator

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Nicodemos Varnava ◽  
Justin H. Wilson ◽  
J. H. Pixley ◽  
David Vanderbilt
Keyword(s):  
Topological Insulator ◽  
Information Science ◽  
Domain Walls ◽  
Quantum Hall ◽  
Edge State ◽  
Wave Functions ◽  
Quantum Hall Systems ◽  
Electron Quantum ◽  
Quantum Point ◽  
Higher Temperature

AbstractEngineering and manipulation of unidirectional channels has been achieved in quantum Hall systems, leading to the construction of electron interferometers and proposals for low-power electronics and quantum information science applications. However, to fully control the mixing and interference of edge-state wave functions, one needs stable and tunable junctions. Encouraged by recent material candidates, here we propose to achieve this using an antiferromagnetic topological insulator that supports two distinct types of gapless unidirectional channels, one from antiferromagnetic domain walls and the other from single-height steps. Their distinct geometric nature allows them to intersect robustly to form quantum point junctions, which then enables their control by magnetic and electrostatic local probes. We show how the existence of stable and tunable junctions, the intrinsic magnetism and the potential for higher-temperature performance make antiferromagnetic topological insulators a promising platform for electron quantum optics and microelectronic applications.

Topological insulator nanostructures: Materials synthesis, Raman spectroscopy, and transport properties

2011 ◽  
Vol 7 (2) ◽  
pp. 208-217 ◽  
Author(s):  
Hui Li ◽  
Hailin Peng ◽  
Wenhui Dang ◽  
Lili Yu ◽  
Zhongfan Liu
Keyword(s):  
Raman Spectroscopy ◽  
Transport Properties ◽  
Topological Insulator ◽  
Materials Synthesis

scholarly journals Enhancement of the Superconducting Gap by Nesting inCaKFe4As4: A New High Temperature Superconductor

2016 ◽  
Vol 117 (27) ◽  
Author(s):  
Daixiang Mou ◽  
Tai Kong ◽  
William R. Meier ◽  
Felix Lochner ◽  
Lin-Lin Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Superconductor ◽  
Superconducting Gap

The Charge Transport Mechanism in a New Magnetic Topological Insulator MnBi0.5Sb1.5Te4

2021 ◽  
Author(s):  
N. A. Abdullayev ◽  
Kh. V. Aliguliyeva ◽  
V. N. Zverev ◽  
Z. S. Aliev ◽  
I. R. Amiraslanov ◽  
...  
Keyword(s):  
Charge Transport ◽  
Topological Insulator ◽  
Transport Mechanism ◽  
Charge Transport Mechanism

Theory on Pseudogap State and Superconducting State in Strong Coupling Superconductors

2000 ◽  
Vol 69 (7) ◽  
pp. 2240-2249 ◽  
Author(s):  
Takanobu Jujo ◽  
Youichi Yanase ◽  
Kosaku Yamada
Keyword(s):  
Strong Coupling ◽  
Superconducting State ◽  
Pseudogap State

scholarly journals Superconducting Gap Structure in Out-of-plane-disordered Bi2Sr2CaCu2O8+δ as Studied by Raman Spectroscopy

2013 ◽  
Vol 45 ◽  
pp. 37-40
Author(s):  
N. Murai ◽  
T. Masui ◽  
M. Ishikado ◽  
S. Ishida ◽  
H. Eisaki ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Superconducting Gap ◽  
Out Of Plane ◽  
Gap Structure

scholarly journals Spin and charge transport induced by a twisted light beam on the surface of a topological insulator

2016 ◽  
Vol 93 (19) ◽  
Author(s):  
Kunitaka Shintani ◽  
Katsuhisa Taguchi ◽  
Yukio Tanaka ◽  
Yuki Kawaguchi
Keyword(s):  
Charge Transport ◽  
Light Beam ◽  
Topological Insulator ◽  
Twisted Light

In situ Raman spectroscopy of topological insulator Bi2Te3 films with varying thickness

Nano Research ◽  
2013 ◽  
Vol 6 (9) ◽  
pp. 688-692 ◽  
Author(s):  
Chunxiao Wang ◽  
Xiegang Zhu ◽  
Louis Nilsson ◽  
Jing Wen ◽  
Guang Wang ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Topological Insulator ◽  
In Situ Raman Spectroscopy ◽  
Varying Thickness ◽  
In Situ Raman

scholarly journals Spatial variation of the two-fold anisotropic superconducting gap in a monolayer of FeSe0.5Te0.5 on a topological insulator

2017 ◽  
Vol 95 (10) ◽  
Author(s):  
A. Kamlapure ◽  
S. Manna ◽  
L. Cornils ◽  
T. Hänke ◽  
M. Bremholm ◽  
...  
Keyword(s):  
Spatial Variation ◽  
Topological Insulator ◽  
Superconducting Gap
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