में बचाया:
| मुख्य लेखकों: | , , , , , , , , , , |
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| स्वरूप: | Preprint |
| प्रकाशित: |
2024
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| विषय: | |
| ऑनलाइन पहुंच: | https://arxiv.org/abs/2403.10141 |
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| _version_ | 1866910368476954624 |
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| author | Manna, Subhadip Nath, Sambhu G Roy, Samrat Aon, Soumik Pal, Sayani Sharma, Kanav Mahapatra, Dhananjaya Mitra, Partha Das, Sourin Pal, Bipul Mitra, Chiranjib |
| author_facet | Manna, Subhadip Nath, Sambhu G Roy, Samrat Aon, Soumik Pal, Sayani Sharma, Kanav Mahapatra, Dhananjaya Mitra, Partha Das, Sourin Pal, Bipul Mitra, Chiranjib |
| contents | We studied longitudinal and Hall photothermal voltages under a planar magnetic field scan in epitaxial thin films of the Topological Insulator (TI) Sb2Te3, grown using pulsed laser deposition (PLD). Unlike prior research that utilised polarised light-induced photocurrent to investigate the TI, our study introduces advancements based on unpolarized light-induced local heating. This method yields a thermoelectric response exhibiting a direct signature of strong spin-orbit coupling. Our analysis reveals three distinct contributions when fitting the photothermal voltage data to the angular dependence of the planar magnetic field. The interaction between the applied magnetic field and the thermal gradient on the bulk band orbitals enables the differentiation between the ordinary Nernst effect from the out-of-plane thermal gradient and an extraordinary magneto-thermal contribution from the planar thermal gradient. The fitting of our data to theoretical models indicates that these effects primarily arise from the bulk states of the TI rather than the surface states. These findings highlight PLD-grown epitaxial topological insulator thin films as promising candidates for optoelectronic devices, including sensors and actuators. Such devices offer controllable responses through position-dependent, non-invasive local heating via focused incident light and variations in the applied magnetic field direction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_10141 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Anisotropic magneto-photothermal voltage in Sb2Te3 topological insulator thin films Manna, Subhadip Nath, Sambhu G Roy, Samrat Aon, Soumik Pal, Sayani Sharma, Kanav Mahapatra, Dhananjaya Mitra, Partha Das, Sourin Pal, Bipul Mitra, Chiranjib Mesoscale and Nanoscale Physics We studied longitudinal and Hall photothermal voltages under a planar magnetic field scan in epitaxial thin films of the Topological Insulator (TI) Sb2Te3, grown using pulsed laser deposition (PLD). Unlike prior research that utilised polarised light-induced photocurrent to investigate the TI, our study introduces advancements based on unpolarized light-induced local heating. This method yields a thermoelectric response exhibiting a direct signature of strong spin-orbit coupling. Our analysis reveals three distinct contributions when fitting the photothermal voltage data to the angular dependence of the planar magnetic field. The interaction between the applied magnetic field and the thermal gradient on the bulk band orbitals enables the differentiation between the ordinary Nernst effect from the out-of-plane thermal gradient and an extraordinary magneto-thermal contribution from the planar thermal gradient. The fitting of our data to theoretical models indicates that these effects primarily arise from the bulk states of the TI rather than the surface states. These findings highlight PLD-grown epitaxial topological insulator thin films as promising candidates for optoelectronic devices, including sensors and actuators. Such devices offer controllable responses through position-dependent, non-invasive local heating via focused incident light and variations in the applied magnetic field direction. |
| title | Anisotropic magneto-photothermal voltage in Sb2Te3 topological insulator thin films |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2403.10141 |