Amplification of terahertz frequency acoustic phonons by drifting electrons in three-dimensional Dirac semimetals

2016 ◽  
Vol 120 (12) ◽  
pp. 125705 ◽  
Author(s):  
K. S. Bhargavi ◽  
S. S. Kubakaddi
Keyword(s):  
Three Dimensional ◽  
Terahertz Frequency ◽  
Acoustic Phonons ◽  
Dirac Semimetals

scholarly journals Theoretical and experimental studies of highly selective planar two-dimensional Bragg structures based on dielectric waveguides in the terahertz frequency range

2019 ◽  
Vol 30 ◽  
pp. 07009
Author(s):  
Naum Ginzburg ◽  
Nikolay Peskov ◽  
Vladislav Zaslavsky ◽  
Ekaterina Kocharovskaya ◽  
Andrey Malkin ◽  
...  
Keyword(s):  
Bragg Reflection ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Dielectric Waveguides ◽  
Two Dimensional ◽  
Terahertz Frequency ◽  
Frequency Range ◽  
Terahertz Frequency Range ◽  
Three Dimensional Modeling ◽  
Bragg Structures

Based on theoretical approach and three-dimensional modeling using the CST Microwave Studio code, planar dielectric two-dimensional Bragg structures in terahertz frequency range were developed and manufactured. Proof-of-principle electrodynamic experiments on the “cold” testing of these structures were carried out. It is shown that the experimental results are in good agreement with the theoretical predicts, including the existence of the highest Q mode inside the Bragg reflection band in the absence of periodicity defects.

scholarly journals Nonlinear Hall Effect in Three-Dimensional Weyl and Dirac Semimetals

JETP Letters ◽  
2019 ◽  
Vol 109 (11) ◽  
pp. 715-721 ◽  
Author(s):  
O. O. Shvetsov ◽  
V. D. Esin ◽  
A. V. Timonina ◽  
N. N. Kolesnikov ◽  
E. V. Deviatov
Keyword(s):  
Hall Effect ◽  
Three Dimensional ◽  
Dirac Semimetals

scholarly journals Tunable Berry curvature and transport crossover in topological Dirac semimetal KZnBi

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Junseong Song ◽  
Byung Cheol Park ◽  
Kyung Ik Sim ◽  
Joonho Bang ◽  
Sunghun Kim ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Hall Resistance ◽  
Rotational Axis ◽  
Material System ◽  
Chiral Fermion ◽  
Quantum Phases ◽  
Berry Curvature ◽  
Dirac Semimetal ◽  
Dirac Semimetals ◽  
Single Material

AbstractTopological Dirac semimetals have emerged as a platform to engineer Berry curvature with time-reversal symmetry breaking, which allows to access diverse quantum states in a single material system. It is of interest to realize such diversity in Dirac semimetals that provides insight on correlation between Berry curvature and quantum transport phenomena. Here, we report the transition between anomalous Hall and chiral fermion states in three-dimensional topological Dirac semimetal KZnBi, which is demonstrated by tuning the direction and flux of Berry curvature. Angle-dependent magneto-transport measurements show that both anomalous Hall resistance and positive magnetoresistance are maximized at 0° between net Berry curvature and rotational axis. We find that the unexpected crossover of anomalous Hall resistance and negative magnetoresistance suddenly occurs when the angle reaches to ~70°, indicating that Berry curvature strongly correlates with quantum transports of Dirac and chiral fermions. It would be interesting to tune Berry curvature within other quantum phases such as topological superconductivity.

Dynamic conductivity modified by impurity resonant states in doping three-dimensional Dirac semimetals

2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Shuai Li ◽  
Chen Wang ◽  
Shi-Han Zheng ◽  
Rui-Qiang Wang ◽  
Jun Li ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Dynamic Conductivity ◽  
Resonant States ◽  
In Doping ◽  
Dirac Semimetals
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