Ultrafast Carrier Relaxation and Second Harmonic Generation in a Higher‐Fold Weyl Fermionic System PtAl
Abstract In topological materials, shielding of bulk and surface states by crystalline symmetries has provided hitherto unknown access to electronic states in condensed matter physics. Interestingly, photoexcited carriers relax on an ultrafast timescales, demonstrating large transient mobility that...
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Wiley-VCH
2024-01-01
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| Series: | Advanced Physics Research |
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| Online Access: | https://doi.org/10.1002/apxr.202300063 |
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| author | Vikas Saini Ajinkya Punjal Utkarsh Kumar Pandey Ruturaj Vikrant Puranik Vikash Sharma Vivek Dwij Kritika Vijay Ruta Kulkarni Soma Banik Aditya Dharmadhikari Bahadur Singh Shriganesh Prabhu A. Thamizhavel |
| author_facet | Vikas Saini Ajinkya Punjal Utkarsh Kumar Pandey Ruturaj Vikrant Puranik Vikash Sharma Vivek Dwij Kritika Vijay Ruta Kulkarni Soma Banik Aditya Dharmadhikari Bahadur Singh Shriganesh Prabhu A. Thamizhavel |
| author_sort | Vikas Saini |
| collection | DOAJ |
| description | Abstract In topological materials, shielding of bulk and surface states by crystalline symmetries has provided hitherto unknown access to electronic states in condensed matter physics. Interestingly, photoexcited carriers relax on an ultrafast timescales, demonstrating large transient mobility that can be harnessed for the development of ultrafast optoelectronic devices. In addition, these devices are much more effective than topologically trivial systems because topological states are resilient to the corresponding symmetry‐invariant perturbations. By using optical pump probe measurements, the relaxation dynamics of a topologically nontrivial chiral single crystal, PtAl, is systematically described. Based on the experimental data on transient reflectivity and electronic structures, it is found that the carrier relaxation process involves both acoustic and optical phonons with oscillation frequencies of 0.06 and 2.94 THz, respectively, in picosecond time scale. PtAl with a space group of P213 allows only one non‐zero susceptibility element, i.e., d14, in second harmonic generation (SHG) with a large value of 468(1) pm V–1, which is significantly higher than that observed in standard GaAs(111) and ZnTe(110) crystals. The intensity dependence of the SHG signal in PtAl reveals a non‐perturbative origin. The present study on PtAl provides deeper insight into topological states that will be useful for ultrafast optoelectronic devices. |
| first_indexed | 2024-03-08T05:31:55Z |
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| language | English |
| last_indexed | 2024-03-08T05:31:55Z |
| publishDate | 2024-01-01 |
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| series | Advanced Physics Research |
| spelling | doaj.art-50cfe9f9e2804a76bbe683dc8b3a3fcd2024-02-06T04:50:39ZengWiley-VCHAdvanced Physics Research2751-12002024-01-0131n/an/a10.1002/apxr.202300063Ultrafast Carrier Relaxation and Second Harmonic Generation in a Higher‐Fold Weyl Fermionic System PtAlVikas Saini0Ajinkya Punjal1Utkarsh Kumar Pandey2Ruturaj Vikrant Puranik3Vikash Sharma4Vivek Dwij5Kritika Vijay6Ruta Kulkarni7Soma Banik8Aditya Dharmadhikari9Bahadur Singh10Shriganesh Prabhu11A. Thamizhavel12Department of Condensed Matter Physics and Materials Science Tata Institute of Fundamental Research Homi Bhabha Road, Colaba Mumbai 400005 IndiaDepartment of Condensed Matter Physics and Materials Science Tata Institute of Fundamental Research Homi Bhabha Road, Colaba Mumbai 400005 IndiaDepartment of Condensed Matter Physics and Materials Science Tata Institute of Fundamental Research Homi Bhabha Road, Colaba Mumbai 400005 IndiaDepartment of Condensed Matter Physics and Materials Science Tata Institute of Fundamental Research Homi Bhabha Road, Colaba Mumbai 400005 IndiaDepartment of Condensed Matter Physics and Materials Science Tata Institute of Fundamental Research Homi Bhabha Road, Colaba Mumbai 400005 IndiaDepartment of Condensed Matter Physics and Materials Science Tata Institute of Fundamental Research Homi Bhabha Road, Colaba Mumbai 400005 IndiaAccelerator Physics and Synchrotrons Utilization Division Raja Ramanna Centre for Advanced Technology Indore 452013 IndiaDepartment of Condensed Matter Physics and Materials Science Tata Institute of Fundamental Research Homi Bhabha Road, Colaba Mumbai 400005 IndiaAccelerator Physics and Synchrotrons Utilization Division Raja Ramanna Centre for Advanced Technology Indore 452013 IndiaDepartment of Nuclear and Atomic Physics Tata Institute of Fundamental Research Homi Bhabha Road, Colaba Mumbai 400005 IndiaDepartment of Condensed Matter Physics and Materials Science Tata Institute of Fundamental Research Homi Bhabha Road, Colaba Mumbai 400005 IndiaDepartment of Condensed Matter Physics and Materials Science Tata Institute of Fundamental Research Homi Bhabha Road, Colaba Mumbai 400005 IndiaDepartment of Condensed Matter Physics and Materials Science Tata Institute of Fundamental Research Homi Bhabha Road, Colaba Mumbai 400005 IndiaAbstract In topological materials, shielding of bulk and surface states by crystalline symmetries has provided hitherto unknown access to electronic states in condensed matter physics. Interestingly, photoexcited carriers relax on an ultrafast timescales, demonstrating large transient mobility that can be harnessed for the development of ultrafast optoelectronic devices. In addition, these devices are much more effective than topologically trivial systems because topological states are resilient to the corresponding symmetry‐invariant perturbations. By using optical pump probe measurements, the relaxation dynamics of a topologically nontrivial chiral single crystal, PtAl, is systematically described. Based on the experimental data on transient reflectivity and electronic structures, it is found that the carrier relaxation process involves both acoustic and optical phonons with oscillation frequencies of 0.06 and 2.94 THz, respectively, in picosecond time scale. PtAl with a space group of P213 allows only one non‐zero susceptibility element, i.e., d14, in second harmonic generation (SHG) with a large value of 468(1) pm V–1, which is significantly higher than that observed in standard GaAs(111) and ZnTe(110) crystals. The intensity dependence of the SHG signal in PtAl reveals a non‐perturbative origin. The present study on PtAl provides deeper insight into topological states that will be useful for ultrafast optoelectronic devices.https://doi.org/10.1002/apxr.202300063chiralitysecond harmonic generationultrafast carrier relaxationWeyl semimetals |
| spellingShingle | Vikas Saini Ajinkya Punjal Utkarsh Kumar Pandey Ruturaj Vikrant Puranik Vikash Sharma Vivek Dwij Kritika Vijay Ruta Kulkarni Soma Banik Aditya Dharmadhikari Bahadur Singh Shriganesh Prabhu A. Thamizhavel Ultrafast Carrier Relaxation and Second Harmonic Generation in a Higher‐Fold Weyl Fermionic System PtAl Advanced Physics Research chirality second harmonic generation ultrafast carrier relaxation Weyl semimetals |
| title | Ultrafast Carrier Relaxation and Second Harmonic Generation in a Higher‐Fold Weyl Fermionic System PtAl |
| title_full | Ultrafast Carrier Relaxation and Second Harmonic Generation in a Higher‐Fold Weyl Fermionic System PtAl |
| title_fullStr | Ultrafast Carrier Relaxation and Second Harmonic Generation in a Higher‐Fold Weyl Fermionic System PtAl |
| title_full_unstemmed | Ultrafast Carrier Relaxation and Second Harmonic Generation in a Higher‐Fold Weyl Fermionic System PtAl |
| title_short | Ultrafast Carrier Relaxation and Second Harmonic Generation in a Higher‐Fold Weyl Fermionic System PtAl |
| title_sort | ultrafast carrier relaxation and second harmonic generation in a higher fold weyl fermionic system ptal |
| topic | chirality second harmonic generation ultrafast carrier relaxation Weyl semimetals |
| url | https://doi.org/10.1002/apxr.202300063 |
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