Ferromagnetic-electrodes-induced Hall effect in topological Dirac semimetals
We propose an unconventional type of Hall effect in a topological Dirac semimetal with ferromagnetic electrodes. The topological Dirac semimetal itself has time-reversal symmetry, whereas attached ferromagnetic electrodes break it, causing the large Hall response. This induced Hall effect is a chara...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2021-07-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.3.033023 |
| _version_ | 1797210971398209536 |
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| author | Koji Kobayashi Kentaro Nomura |
| author_facet | Koji Kobayashi Kentaro Nomura |
| author_sort | Koji Kobayashi |
| collection | DOAJ |
| description | We propose an unconventional type of Hall effect in a topological Dirac semimetal with ferromagnetic electrodes. The topological Dirac semimetal itself has time-reversal symmetry, whereas attached ferromagnetic electrodes break it, causing the large Hall response. This induced Hall effect is a characteristic of the helical surface/edge states that arise in topological materials such as topological Dirac semimetals or quantum spin Hall insulators. We compute the Hall conductance/resistance and the Hall angle by using a lattice model with four-terminal geometry. For topological Dirac semimetals with four electrodes, the induced Hall effect occurs whether the current electrodes or the voltage electrodes are ferromagnetic. When the spins in electrodes are almost fully polarized, the Hall angle becomes as large as that of quantum Hall states or ideal magnetic Weyl semimetals. We show the robustness of the induced Hall effect against impurities and also discuss the spin injection and spin decay problems. This Hall response can be used to detect whether the magnetizations of the two ferromagnetic electrodes are parallel or antiparallel. |
| first_indexed | 2024-04-24T10:19:04Z |
| format | Article |
| id | doaj.art-0f0090f67b574c69ba8d016010ce78a0 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:19:04Z |
| publishDate | 2021-07-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-0f0090f67b574c69ba8d016010ce78a02024-04-12T17:11:30ZengAmerican Physical SocietyPhysical Review Research2643-15642021-07-013303302310.1103/PhysRevResearch.3.033023Ferromagnetic-electrodes-induced Hall effect in topological Dirac semimetalsKoji KobayashiKentaro NomuraWe propose an unconventional type of Hall effect in a topological Dirac semimetal with ferromagnetic electrodes. The topological Dirac semimetal itself has time-reversal symmetry, whereas attached ferromagnetic electrodes break it, causing the large Hall response. This induced Hall effect is a characteristic of the helical surface/edge states that arise in topological materials such as topological Dirac semimetals or quantum spin Hall insulators. We compute the Hall conductance/resistance and the Hall angle by using a lattice model with four-terminal geometry. For topological Dirac semimetals with four electrodes, the induced Hall effect occurs whether the current electrodes or the voltage electrodes are ferromagnetic. When the spins in electrodes are almost fully polarized, the Hall angle becomes as large as that of quantum Hall states or ideal magnetic Weyl semimetals. We show the robustness of the induced Hall effect against impurities and also discuss the spin injection and spin decay problems. This Hall response can be used to detect whether the magnetizations of the two ferromagnetic electrodes are parallel or antiparallel.http://doi.org/10.1103/PhysRevResearch.3.033023 |
| spellingShingle | Koji Kobayashi Kentaro Nomura Ferromagnetic-electrodes-induced Hall effect in topological Dirac semimetals Physical Review Research |
| title | Ferromagnetic-electrodes-induced Hall effect in topological Dirac semimetals |
| title_full | Ferromagnetic-electrodes-induced Hall effect in topological Dirac semimetals |
| title_fullStr | Ferromagnetic-electrodes-induced Hall effect in topological Dirac semimetals |
| title_full_unstemmed | Ferromagnetic-electrodes-induced Hall effect in topological Dirac semimetals |
| title_short | Ferromagnetic-electrodes-induced Hall effect in topological Dirac semimetals |
| title_sort | ferromagnetic electrodes induced hall effect in topological dirac semimetals |
| url | http://doi.org/10.1103/PhysRevResearch.3.033023 |
| work_keys_str_mv | AT kojikobayashi ferromagneticelectrodesinducedhalleffectintopologicaldiracsemimetals AT kentaronomura ferromagneticelectrodesinducedhalleffectintopologicaldiracsemimetals |