التفاصيل البيبلوغرافية
| العنوان: |
Ambipolar magneto-optical response of ultra-low carrier density topological insulators |
| المؤلفون: |
Mintu Mondal, N. P. Armitage, Seongshik Oh, Dipanjan Chaudhuri, Jisoo Moon, Sayak Dasgupta, Maryam Salehi, Deepti Jain |
| بيانات النشر: |
arXiv, 2020. |
| سنة النشر: |
2020 |
| مصطلحات موضوعية: |
Magnetoelectric effect, FOS: Physical sciences, 02 engineering and technology, 01 natural sciences, Optical conductivity, law.invention, symbols.namesake, Condensed Matter::Materials Science, law, 0103 physical sciences, Faraday effect, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 010306 general physics, Faraday cage, Physics, Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed matter physics, Ambipolar diffusion, Fermi level, Materials Science (cond-mat.mtrl-sci), 021001 nanoscience & nanotechnology, Condensed Matter - Other Condensed Matter, Topological insulator, symbols, 0210 nano-technology, Parity anomaly, Other Condensed Matter (cond-mat.other) |
| الوصف: |
We have investigated the THz range magneto-optical response of ultralow carrier density films of Sb$_2$Te$_3$ using time-domain THz polarimetry. Undoped Sb$_2$Te$_3$ has a chemical potential that lies inside the bulk valence band. Thus its topological response is masked by bulk carriers. However, with appropriate buffer layer engineering and chemical doping, Sb$_2$Te$_3$ thin films can be grown with extremely low electron or hole densities. The ultralow carrier density samples show unusual optical properties and quantized response in the presence of magnetic fields. Consistent with the expectations for Dirac fermions, a quantized Hall response is seen even in samples where the zero field conductivity falls below detectable levels. The discontinuity in the Faraday angle with small changes in the filling fraction across zero is manifestation of the parity anomaly in 2D Dirac systems with broken time reversal symmetry. |
| DOI: |
10.48550/arxiv.2010.10273 |
| URL الوصول: |
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ed922f9c37f6feed6ae2b23c46370ad0 |
| Rights: |
OPEN |
| رقم الانضمام: |
edsair.doi.dedup.....ed922f9c37f6feed6ae2b23c46370ad0 |
| قاعدة البيانات: |
OpenAIRE |