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THz-range Faraday rotation in the Weyl semimetal candidate Co2 TiGe

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/5.0033536· OSTI ID:1851907
 [1];  [2];  [3];  [4];  [3];  [2]
  1. Johns Hopkins Univ., Baltimore, MD (United States). The Inst. of Quantum Matter. Dept. of Physics and Astronomy; Johns Hopkins Univ., Baltimore, MD (United States)
  2. Johns Hopkins Univ., Baltimore, MD (United States). The Inst. of Quantum Matter. Dept. of Physics and Astronomy
  3. Univ. of California, Santa Barbara, CA (United States). Materials Dept.
  4. Univ. of California, Santa Barbara, CA (United States). Dept. of Electrical & Computer Engineering
+ Show Author Affiliations
The Co2 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 Co2TiGe. Recently, high-quality molecular beam epitaxy-grown thin films of Co2TiGe have become available. In this work, we present a THz-range measurement of MBE-grown Co2TiGe 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. Overall, our work shows that this class of Heusler materials shows promise for Weyl semimetal based spintronics.
Research Organization:
Johns Hopkins Univ., Baltimore, MD (United States); Univ. of California, Santa Barbara, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0014388; SC0019331
OSTI ID:
1851907
Alternate ID(s):
OSTI ID: 1749963
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 24 Vol. 128; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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71 CLASSICAL AND QUANTUM MECHANICS
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