Crossover from gapped-to-gapless Dirac surface states in magnetic topologicalinsulator MnBi₂Te₄
© 2023 IOP Publishing Ltd..
Intrinsic magnetic topological insulators (MTI) host exotic topological phases such as quantized anomalous Hall insulating phase, arising due to the large magnetic exchange gap. However, the interplay of magnetism and topology in these systems in different temperature regimes remains elusive. In this work, we present the logarithmic temperature-dependence of conductivity for sub-100 nm thick exfoliated flakes of MTI MnBi2Te4 in the presence of out-of-plane magnetic fields and extracted the linear slope, κ. We observed a characteristic change, ∆κ ∼ -0.5 in the low-temperature regime, indicating the gapped Dirac surface state according to Lu-Shen theory. We also report the recovery of topological properties in the system via the weak-antilocalization (WAL) effect in the vicinity of antiferromagnetic to paramagnetic transition and in the paramagnetic regime. Hikami-Larkin-Nagaoka (HLN) analysis suggested the presence of topological surface states. Therefore, our study helps in understanding how intrinsic magnetism masks topological properties in an MTI as long as magnetic ordering persists.
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| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - year:2023 |
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| Enthalten in: |
Journal of physics. Condensed matter : an Institute of Physics journal - (2023) vom: 26. Okt. |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Rastogi, Gagan [VerfasserIn] |
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| Links: |
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| Themen: |
Journal Article |
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| Anmerkungen: |
Date Revised 26.10.2023 published: Print-Electronic Citation Status Publisher |
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| doi: |
10.1088/1361-648X/ad0765 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM363760792 |
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| 520 | |a © 2023 IOP Publishing Ltd. | ||
| 520 | |a Intrinsic magnetic topological insulators (MTI) host exotic topological phases such as quantized anomalous Hall insulating phase, arising due to the large magnetic exchange gap. However, the interplay of magnetism and topology in these systems in different temperature regimes remains elusive. In this work, we present the logarithmic temperature-dependence of conductivity for sub-100 nm thick exfoliated flakes of MTI MnBi2Te4 in the presence of out-of-plane magnetic fields and extracted the linear slope, κ. We observed a characteristic change, ∆κ ∼ -0.5 in the low-temperature regime, indicating the gapped Dirac surface state according to Lu-Shen theory. We also report the recovery of topological properties in the system via the weak-antilocalization (WAL) effect in the vicinity of antiferromagnetic to paramagnetic transition and in the paramagnetic regime. Hikami-Larkin-Nagaoka (HLN) analysis suggested the presence of topological surface states. Therefore, our study helps in understanding how intrinsic magnetism masks topological properties in an MTI as long as magnetic ordering persists.
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| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Spin-flop transition | |
| 650 | 4 | |a Surface states | |
| 650 | 4 | |a magnetic topological insulator | |
| 700 | 1 | |a Mohapatra, Abhinab |e verfasserin |4 aut | |
| 700 | 1 | |a Mishra, Pramita |e verfasserin |4 aut | |
| 700 | 1 | |a Mandal, Shoubhik |e verfasserin |4 aut | |
| 700 | 1 | |a Kulkarni, Ruta |e verfasserin |4 aut | |
| 700 | 1 | |a Ganesan, R |e verfasserin |4 aut | |
| 700 | 1 | |a Thamizhavel, Arumugam |e verfasserin |4 aut | |
| 700 | 1 | |a Kumar, P S Anil |e verfasserin |4 aut | |
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