تقرير
Band Structure and Polarization Effects in Photothermoelectric Spectroscopy of a Bi2Se3 Device
| العنوان: | Band Structure and Polarization Effects in Photothermoelectric Spectroscopy of a Bi2Se3 Device |
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| المؤلفون: | Pournia, Seyyedesadaf, Jnawali, Giriraj, Need, Ryan F., Jackson, Howard E., Wilson, Stephen D., Smith, Leigh M. |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science |
| الوصف: | Bi2Se3 is a prototypical topological insulator which has a small band gap (~0.3 eV) and topologically protected conducting surface states. This material exhibits quite strong thermoelectric effects. Here we show in a mechanically exfoliated thick (~100 nm) nanoflake device that we can measure the energy dependent optical absorption through the photothermoelectric effect. Spectral signatures are seen for a number of optical transitions between the valence and conduction bands, including a broad peak at 1.5 eV which is likely dominated by bulk band-to-band optical transitions but is at the same energy as the well known optical transition between the two topologically protected conducting surface states. We also observe a surprising linear polarization dependence in the response of the device that reflects the influence of the metal contacts. Comment: 17 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/5.0075924 |
| URL الوصول: | http://arxiv.org/abs/2110.10799 |
| رقم الأكسشن: | edsarx.2110.10799 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/5.0075924 |
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