The family of ferromagnetic Heusler alloys has attracted interest due to their fully spin-polarized nature, making them ideal for applications in spintronic devices. More recently, the existence of room temperature time-reversal-breaking Weyl nodes near the Fermi level was predicted and confirmed in these systems. As a result of the presence of these Weyl nodes, these systems possess a non-zero momentum space Berry curvature that can dramatically influence transport properties such as the anomalous Hall effect. One of these candidate compounds is . Recently, high-quality molecular beam epitaxy-grown thin films of have become available. In this work, we present a THz-range measurement of MBE-grown films. We measure the THz-range Faraday rotation, which can be understood as a measure of the anomalous Hall effect. We supplement this work with electronic band-structure calculations showing that the principal contribution to the anomalous Hall effect in this material stems from the Berry curvature of the material. Our work shows that this class of Heusler materials shows promise for Weyl semimetal based spintronics.
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THz-range Faraday rotation in the Weyl semimetal candidate Co2TiGe
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28 December 2020
Research Article|
December 28 2020
THz-range Faraday rotation in the Weyl semimetal candidate Co2TiGe
Rishi Bhandia
;
Rishi Bhandia
1
The Institute of Quantum Matter, Department of Physics and Astronomy, The Johns Hopkins University
, Baltimore, Maryland 21218, USA
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Bing Cheng;
Bing Cheng
1
The Institute of Quantum Matter, Department of Physics and Astronomy, The Johns Hopkins University
, Baltimore, Maryland 21218, USA
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Tobias L. Brown-Heft;
Tobias L. Brown-Heft
2
Materials Department, University of California–Santa Barbara
, Santa Barbara, California 93106, USA
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Shouvik Chatterjee
;
Shouvik Chatterjee
3
Department of Electrical & Computer Engineering, University of California–Santa Barbara
, Santa Barbara, California 93106, USA
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Christopher J. Palmstrøm
;
Christopher J. Palmstrøm
2
Materials Department, University of California–Santa Barbara
, Santa Barbara, California 93106, USA
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N. P. Armitage
N. P. Armitage
a)
1
The Institute of Quantum Matter, Department of Physics and Astronomy, The Johns Hopkins University
, Baltimore, Maryland 21218, USA
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
J. Appl. Phys. 128, 244303 (2020)
Article history
Received:
October 16 2020
Accepted:
December 03 2020
Citation
Rishi Bhandia, Bing Cheng, Tobias L. Brown-Heft, Shouvik Chatterjee, Christopher J. Palmstrøm, N. P. Armitage; THz-range Faraday rotation in the Weyl semimetal candidate Co2TiGe. J. Appl. Phys. 28 December 2020; 128 (24): 244303. https://doi.org/10.1063/5.0033536
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