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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.16432 |
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| _version_ | 1866911888107896832 |
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| author | Bielinski, Nina Chari, Rajas May-Mann, Julian Kim, Soyeun Zwettler, Jack Deng, Yujun Aishwarya, Anuva Roychowdhury, Subhajit Shekhar, Chandra Hashimoto, Makoto Lu, Donghui Yan, Jiaqiang Felser, Claudia Madhavan, Vidya Shen, Zhi-Xun Hughes, Taylor L. Mahmood, Fahad |
| author_facet | Bielinski, Nina Chari, Rajas May-Mann, Julian Kim, Soyeun Zwettler, Jack Deng, Yujun Aishwarya, Anuva Roychowdhury, Subhajit Shekhar, Chandra Hashimoto, Makoto Lu, Donghui Yan, Jiaqiang Felser, Claudia Madhavan, Vidya Shen, Zhi-Xun Hughes, Taylor L. Mahmood, Fahad |
| contents | Manipulating solids using the time-periodic drive of a laser pulse is a promising route to generate new phases of matter. Whether such `Floquet-Bloch' manipulation can be achieved in topological magnetic systems with disorder has so far been unclear. In this work, we realize Floquet-Bloch manipulation of the Dirac surface-state mass of the topological antiferromagnet (AFM) MnBi$_2$Te$_4$. Using time- and angle-resolved photoemission spectroscopy (tr-ARPES), we show that opposite helicities of mid-infrared circularly polarized light result in substantially different Dirac mass gaps in the AFM phase, despite the equilibrium Dirac cone being massless. We explain our findings in terms of a Dirac fermion with a random mass. Our results underscore Floquet-Bloch manipulation as a powerful tool for controlling topology even in the presence of disorder, and for uncovering properties of materials that may elude conventional probes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_16432 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Revealing the hidden Dirac gap in a topological antiferromagnet using Floquet-Bloch manipulation Bielinski, Nina Chari, Rajas May-Mann, Julian Kim, Soyeun Zwettler, Jack Deng, Yujun Aishwarya, Anuva Roychowdhury, Subhajit Shekhar, Chandra Hashimoto, Makoto Lu, Donghui Yan, Jiaqiang Felser, Claudia Madhavan, Vidya Shen, Zhi-Xun Hughes, Taylor L. Mahmood, Fahad Mesoscale and Nanoscale Physics Manipulating solids using the time-periodic drive of a laser pulse is a promising route to generate new phases of matter. Whether such `Floquet-Bloch' manipulation can be achieved in topological magnetic systems with disorder has so far been unclear. In this work, we realize Floquet-Bloch manipulation of the Dirac surface-state mass of the topological antiferromagnet (AFM) MnBi$_2$Te$_4$. Using time- and angle-resolved photoemission spectroscopy (tr-ARPES), we show that opposite helicities of mid-infrared circularly polarized light result in substantially different Dirac mass gaps in the AFM phase, despite the equilibrium Dirac cone being massless. We explain our findings in terms of a Dirac fermion with a random mass. Our results underscore Floquet-Bloch manipulation as a powerful tool for controlling topology even in the presence of disorder, and for uncovering properties of materials that may elude conventional probes. |
| title | Revealing the hidden Dirac gap in a topological antiferromagnet using Floquet-Bloch manipulation |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2405.16432 |