Emergent topological properties in spatially modulated sub-wavelength barrier lattices
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866908977311252480 |
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| author | Žlabys, Giedrius He, Wen-Bin Burba, Domantas Nair, Sarika Sasidharan Busch, Thomas Ozawa, Tomoki |
| author_facet | Žlabys, Giedrius He, Wen-Bin Burba, Domantas Nair, Sarika Sasidharan Busch, Thomas Ozawa, Tomoki |
| contents | We investigate topological phenomena in a spatially modulated Dirac-$δ$ lattice, where the scattering potential varies periodically in space. Changing the potential modulation frequency leads to Hofstadter's butterfly-like energy spectrum and enables the emergence of topological transport regimes characterized by non-trivial Chern numbers. We show how the considered modulated system is connected to the Hofstadter model via the Harper equation. By adiabatically varying spatial modulation parameters, we demonstrate controllable quantum transport and verify the topological nature of these effects through Wannier center displacement and bulk invariant calculations. We also propose an experimentally feasible realization of such a system using optically controlled three-level atoms. Our findings showcase spatially engineered Kronig-Penney-type systems as versatile platforms for investigating and exploiting different topological quantum transport regimes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_16187 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Emergent topological properties in spatially modulated sub-wavelength barrier lattices Žlabys, Giedrius He, Wen-Bin Burba, Domantas Nair, Sarika Sasidharan Busch, Thomas Ozawa, Tomoki Quantum Gases We investigate topological phenomena in a spatially modulated Dirac-$δ$ lattice, where the scattering potential varies periodically in space. Changing the potential modulation frequency leads to Hofstadter's butterfly-like energy spectrum and enables the emergence of topological transport regimes characterized by non-trivial Chern numbers. We show how the considered modulated system is connected to the Hofstadter model via the Harper equation. By adiabatically varying spatial modulation parameters, we demonstrate controllable quantum transport and verify the topological nature of these effects through Wannier center displacement and bulk invariant calculations. We also propose an experimentally feasible realization of such a system using optically controlled three-level atoms. Our findings showcase spatially engineered Kronig-Penney-type systems as versatile platforms for investigating and exploiting different topological quantum transport regimes. |
| title | Emergent topological properties in spatially modulated sub-wavelength barrier lattices |
| topic | Quantum Gases |
| url | https://arxiv.org/abs/2512.16187 |