Signature of pseudodiffusive transport in mesoscopic topological insulators
One of the unique features of Dirac Fermions is pseudodiffusive transport by evanescent modes at low Fermi energies when disorder is low. At higher Fermi energies, i.e., charge carrier densities, the electrical transport is diffusive in nature and the propagation occurs via plane waves. In this stud...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2020-07-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.033019 |
| _version_ | 1797211416858460160 |
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| author | Saurav Islam Semonti Bhattacharyya Hariharan Nhalil Suja Elizabeth Arindam Ghosh |
| author_facet | Saurav Islam Semonti Bhattacharyya Hariharan Nhalil Suja Elizabeth Arindam Ghosh |
| author_sort | Saurav Islam |
| collection | DOAJ |
| description | One of the unique features of Dirac Fermions is pseudodiffusive transport by evanescent modes at low Fermi energies when disorder is low. At higher Fermi energies, i.e., charge carrier densities, the electrical transport is diffusive in nature and the propagation occurs via plane waves. In this study, we report the detection of such evanescent modes in the surface states of topological insulator through 1/f noise for the first time. While signatures of pseudodiffusive transport have been seen experimentally in graphene, such behavior is yet to be observed explicitly in any other system with a Dirac dispersion. To probe this, we have studied 1/f noise in topological insulators as a function of gate voltage, and temperature. Our results show a nonmonotonic behavior in 1/f noise as the gate voltage is varied, suggesting a crossover from pseudodiffusive to diffusive transport regime in mesoscopic topological insulators. The temperature dependence of noise points towards conductance fluctuations from quantum interference as the dominant source of the noise in these samples. |
| first_indexed | 2024-04-24T10:26:09Z |
| format | Article |
| id | doaj.art-9d0719a4633d4dd793939720d5c01e8d |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:26:09Z |
| publishDate | 2020-07-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-9d0719a4633d4dd793939720d5c01e8d2024-04-12T16:56:35ZengAmerican Physical SocietyPhysical Review Research2643-15642020-07-012303301910.1103/PhysRevResearch.2.033019Signature of pseudodiffusive transport in mesoscopic topological insulatorsSaurav IslamSemonti BhattacharyyaHariharan NhalilSuja ElizabethArindam GhoshOne of the unique features of Dirac Fermions is pseudodiffusive transport by evanescent modes at low Fermi energies when disorder is low. At higher Fermi energies, i.e., charge carrier densities, the electrical transport is diffusive in nature and the propagation occurs via plane waves. In this study, we report the detection of such evanescent modes in the surface states of topological insulator through 1/f noise for the first time. While signatures of pseudodiffusive transport have been seen experimentally in graphene, such behavior is yet to be observed explicitly in any other system with a Dirac dispersion. To probe this, we have studied 1/f noise in topological insulators as a function of gate voltage, and temperature. Our results show a nonmonotonic behavior in 1/f noise as the gate voltage is varied, suggesting a crossover from pseudodiffusive to diffusive transport regime in mesoscopic topological insulators. The temperature dependence of noise points towards conductance fluctuations from quantum interference as the dominant source of the noise in these samples.http://doi.org/10.1103/PhysRevResearch.2.033019 |
| spellingShingle | Saurav Islam Semonti Bhattacharyya Hariharan Nhalil Suja Elizabeth Arindam Ghosh Signature of pseudodiffusive transport in mesoscopic topological insulators Physical Review Research |
| title | Signature of pseudodiffusive transport in mesoscopic topological insulators |
| title_full | Signature of pseudodiffusive transport in mesoscopic topological insulators |
| title_fullStr | Signature of pseudodiffusive transport in mesoscopic topological insulators |
| title_full_unstemmed | Signature of pseudodiffusive transport in mesoscopic topological insulators |
| title_short | Signature of pseudodiffusive transport in mesoscopic topological insulators |
| title_sort | signature of pseudodiffusive transport in mesoscopic topological insulators |
| url | http://doi.org/10.1103/PhysRevResearch.2.033019 |
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