Midgap states induced by Zeeman field and $p$ wave superconductor pairing
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866916253148381184 |
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| author | Jin, Yuanjun Yue, XingYu Xu, Yong Yu, Xiang-Long Chang, Guoqing |
| author_facet | Jin, Yuanjun Yue, XingYu Xu, Yong Yu, Xiang-Long Chang, Guoqing |
| contents | The one-dimensional Su-Schrieffer-Heeger (SSH) model is central to band topology in condensed matter physics, which allows us to understand and design distinct topological states. In this work, we find another mechanism to analogize the SSH model in a spinful system, realizing an obstructed atomic insulator by introducing intrinsic spin-orbit coupling and in-plane Zeeman field. In our model, the midgap states originate from a quantized hidden polarization with invariant index $\mathbb{Z}_2$ (0; 01) due to the local inversion symmetry breaking. When the global inversion symmetry is broken, a charge pumping is designed by tuning the polarization. Moreover, by introducing the $p+ip$ superconductor pairing potential, a new topological phase dubbed obstructed superconductor (OSC) is identified. This new state is characterized by invariant index $\mathbb{Z}_2$ (0; 01) and nonchiral midgap states. More interestingly, these nonchiral edge states result in a chiral-like nonlocal conductance, which is different from the traditional chiral topological superconductor. Our findings not only find another strategy to achieve a spinful SSH model but also predict the existence of OSC, providing a promising avenue for further exploration of its transport properties. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2308_14564 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Midgap states induced by Zeeman field and $p$ wave superconductor pairing Jin, Yuanjun Yue, XingYu Xu, Yong Yu, Xiang-Long Chang, Guoqing Mesoscale and Nanoscale Physics Other Condensed Matter Superconductivity The one-dimensional Su-Schrieffer-Heeger (SSH) model is central to band topology in condensed matter physics, which allows us to understand and design distinct topological states. In this work, we find another mechanism to analogize the SSH model in a spinful system, realizing an obstructed atomic insulator by introducing intrinsic spin-orbit coupling and in-plane Zeeman field. In our model, the midgap states originate from a quantized hidden polarization with invariant index $\mathbb{Z}_2$ (0; 01) due to the local inversion symmetry breaking. When the global inversion symmetry is broken, a charge pumping is designed by tuning the polarization. Moreover, by introducing the $p+ip$ superconductor pairing potential, a new topological phase dubbed obstructed superconductor (OSC) is identified. This new state is characterized by invariant index $\mathbb{Z}_2$ (0; 01) and nonchiral midgap states. More interestingly, these nonchiral edge states result in a chiral-like nonlocal conductance, which is different from the traditional chiral topological superconductor. Our findings not only find another strategy to achieve a spinful SSH model but also predict the existence of OSC, providing a promising avenue for further exploration of its transport properties. |
| title | Midgap states induced by Zeeman field and $p$ wave superconductor pairing |
| topic | Mesoscale and Nanoscale Physics Other Condensed Matter Superconductivity |
| url | https://arxiv.org/abs/2308.14564 |