Chirality manipulation of ultrafast phase switchings in a correlated CDW-Weyl semimetal
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arXiv
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| Format: | Preprint |
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2023
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| author | Cheng, Bing Cheng, Di Jiang, Tao Xia, Wei Song, Boqun Mootz, Martin Luo, Liang Perakis, Ilias E. Yao, Yongxin Guo, Yanfeng Wang, Jigang |
| author_facet | Cheng, Bing Cheng, Di Jiang, Tao Xia, Wei Song, Boqun Mootz, Martin Luo, Liang Perakis, Ilias E. Yao, Yongxin Guo, Yanfeng Wang, Jigang |
| contents | A recently emerging concept for quantum phase discovery is the controlled gapping of linear band crossings in topological semimetals. For example, achieving topological superconducting and charge-density-wave (CDW) gapping could introduce Majorana zero modes and axion electrodynamics, respectively. Light engineering of correlation gaps in topological materials provides a new avenue of achieving exotic topological phases inaccessible by conventional tuning methods such as doping and straining. Here we demonstrate a light control of correlation gaps and ultrafast phase switchings in a model CDW and polaron insulator (TaSe$_4$)$_2$I recently predicted to be an axion insulator. Our ultrafast terahertz photocurrent spectroscopy reveals a two-step, non-thermal melting of polarons and electronic CDW gap via studying the fluence dependence of a {\em longitudinal} circular photogalvanic current. The helicity-dependent photocurrent observed along the propagation of light reveals continuous ultrafast switchings from the polaronic state, to the CDW (axion) phase, and finally to a hidden Weyl phase as the pump fluence increases. Other distinguishing features corroborating with the light-induced switchings include: mode-selective coupling of coherent phonons to polaron and CDW modulation, and the emergence of a {\em non-thermal} chiral photocurrent above pump threshold of CDW-related phonons. The ultrafast chirality control of correlated topological states revealed here is important to realize axion electrodynamics and quantum computing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_03895 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Chirality manipulation of ultrafast phase switchings in a correlated CDW-Weyl semimetal Cheng, Bing Cheng, Di Jiang, Tao Xia, Wei Song, Boqun Mootz, Martin Luo, Liang Perakis, Ilias E. Yao, Yongxin Guo, Yanfeng Wang, Jigang Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science A recently emerging concept for quantum phase discovery is the controlled gapping of linear band crossings in topological semimetals. For example, achieving topological superconducting and charge-density-wave (CDW) gapping could introduce Majorana zero modes and axion electrodynamics, respectively. Light engineering of correlation gaps in topological materials provides a new avenue of achieving exotic topological phases inaccessible by conventional tuning methods such as doping and straining. Here we demonstrate a light control of correlation gaps and ultrafast phase switchings in a model CDW and polaron insulator (TaSe$_4$)$_2$I recently predicted to be an axion insulator. Our ultrafast terahertz photocurrent spectroscopy reveals a two-step, non-thermal melting of polarons and electronic CDW gap via studying the fluence dependence of a {\em longitudinal} circular photogalvanic current. The helicity-dependent photocurrent observed along the propagation of light reveals continuous ultrafast switchings from the polaronic state, to the CDW (axion) phase, and finally to a hidden Weyl phase as the pump fluence increases. Other distinguishing features corroborating with the light-induced switchings include: mode-selective coupling of coherent phonons to polaron and CDW modulation, and the emergence of a {\em non-thermal} chiral photocurrent above pump threshold of CDW-related phonons. The ultrafast chirality control of correlated topological states revealed here is important to realize axion electrodynamics and quantum computing. |
| title | Chirality manipulation of ultrafast phase switchings in a correlated CDW-Weyl semimetal |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2308.03895 |