Pseudo-proper two-dimensional electron gas formation
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866914967370858496 |
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| author | Bennett, Daniel Aguado-Puente, Pablo Artacho, Emilio Bristowe, Nicholas |
| author_facet | Bennett, Daniel Aguado-Puente, Pablo Artacho, Emilio Bristowe, Nicholas |
| contents | In spite of the interest in the two-dimensional electron gases (2DEGs) experimentally found at surfaces and interfaces, important uncertainties remain about the observed insulator--metal transitions (IMTs). Here we show how an explicit improper coupling of carrier sources with a relevant soft mode significantly affects the transition. The analysis presented here for 2DEGs at polar interfaces is based on group theory, Landau-Ginzburg theory, and illustrated with first-principles calculations for the prototypical case of the LaAlO$_3$/SrTiO$_3$ interface, for which such a structural transition has recently been observed. This direct coupling implies that the appearance of the soft mode is always accompanied by carriers. For sufficiently strong coupling an avalanche-like first-order IMT is predicted. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_03016 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Pseudo-proper two-dimensional electron gas formation Bennett, Daniel Aguado-Puente, Pablo Artacho, Emilio Bristowe, Nicholas Mesoscale and Nanoscale Physics Materials Science In spite of the interest in the two-dimensional electron gases (2DEGs) experimentally found at surfaces and interfaces, important uncertainties remain about the observed insulator--metal transitions (IMTs). Here we show how an explicit improper coupling of carrier sources with a relevant soft mode significantly affects the transition. The analysis presented here for 2DEGs at polar interfaces is based on group theory, Landau-Ginzburg theory, and illustrated with first-principles calculations for the prototypical case of the LaAlO$_3$/SrTiO$_3$ interface, for which such a structural transition has recently been observed. This direct coupling implies that the appearance of the soft mode is always accompanied by carriers. For sufficiently strong coupling an avalanche-like first-order IMT is predicted. |
| title | Pseudo-proper two-dimensional electron gas formation |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2401.03016 |