Time, momentum, and energy resolved pump-probe tunneling spectroscopy of two-dimensional electron systems
Abstract Real-time probing of electrons can uncover intricate relaxation mechanisms and many-body interactions in strongly correlated materials. Here, we introduce time, momentum, and energy resolved pump-probe tunneling spectroscopy (Tr-MERTS). The method allows the injection of electrons at a part...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-11-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-43268-1 |
| _version_ | 1797557936804855808 |
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| author | H. M. Yoo M. Korkusinski D. Miravet K. W. Baldwin K. West L. Pfeiffer P. Hawrylak R. C. Ashoori |
| author_facet | H. M. Yoo M. Korkusinski D. Miravet K. W. Baldwin K. West L. Pfeiffer P. Hawrylak R. C. Ashoori |
| author_sort | H. M. Yoo |
| collection | DOAJ |
| description | Abstract Real-time probing of electrons can uncover intricate relaxation mechanisms and many-body interactions in strongly correlated materials. Here, we introduce time, momentum, and energy resolved pump-probe tunneling spectroscopy (Tr-MERTS). The method allows the injection of electrons at a particular energy and observation of their subsequent decay in energy-momentum space. Using Tr-MERTS, we visualize electronic decay processes, with lifetimes from tens of nanoseconds to tens of microseconds, in Landau levels formed in a GaAs quantum well. Although most observed features agree with simple energy-relaxation, we discovered a splitting in the nonequilibrium energy spectrum in the vicinity of a ferromagnetic state. An exact diagonalization study suggests that the splitting arises from a maximally spin-polarized state with higher energy than a conventional equilibrium skyrmion. Furthermore, we observe time-dependent relaxation of the splitting, which we attribute to single-flipped spins forming skyrmions. These results establish Tr-MERTS as a powerful tool for studying the properties of a 2DES beyond equilibrium. |
| first_indexed | 2024-03-10T17:23:20Z |
| format | Article |
| id | doaj.art-507ba4f0c4b245f4b1e4b75082ba46bb |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-10T17:23:20Z |
| publishDate | 2023-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-507ba4f0c4b245f4b1e4b75082ba46bb2023-11-20T10:15:54ZengNature PortfolioNature Communications2041-17232023-11-011411610.1038/s41467-023-43268-1Time, momentum, and energy resolved pump-probe tunneling spectroscopy of two-dimensional electron systemsH. M. Yoo0M. Korkusinski1D. Miravet2K. W. Baldwin3K. West4L. Pfeiffer5P. Hawrylak6R. C. Ashoori7Department of Physics, Massachusetts Institute of TechnologyEmerging Technologies Division, National Research Council of CanadaDepartment of Physics, University of OttawaDepartment of Electrical Engineering, Princeton UniversityDepartment of Electrical Engineering, Princeton UniversityDepartment of Electrical Engineering, Princeton UniversityDepartment of Physics, University of OttawaDepartment of Physics, Massachusetts Institute of TechnologyAbstract Real-time probing of electrons can uncover intricate relaxation mechanisms and many-body interactions in strongly correlated materials. Here, we introduce time, momentum, and energy resolved pump-probe tunneling spectroscopy (Tr-MERTS). The method allows the injection of electrons at a particular energy and observation of their subsequent decay in energy-momentum space. Using Tr-MERTS, we visualize electronic decay processes, with lifetimes from tens of nanoseconds to tens of microseconds, in Landau levels formed in a GaAs quantum well. Although most observed features agree with simple energy-relaxation, we discovered a splitting in the nonequilibrium energy spectrum in the vicinity of a ferromagnetic state. An exact diagonalization study suggests that the splitting arises from a maximally spin-polarized state with higher energy than a conventional equilibrium skyrmion. Furthermore, we observe time-dependent relaxation of the splitting, which we attribute to single-flipped spins forming skyrmions. These results establish Tr-MERTS as a powerful tool for studying the properties of a 2DES beyond equilibrium.https://doi.org/10.1038/s41467-023-43268-1 |
| spellingShingle | H. M. Yoo M. Korkusinski D. Miravet K. W. Baldwin K. West L. Pfeiffer P. Hawrylak R. C. Ashoori Time, momentum, and energy resolved pump-probe tunneling spectroscopy of two-dimensional electron systems Nature Communications |
| title | Time, momentum, and energy resolved pump-probe tunneling spectroscopy of two-dimensional electron systems |
| title_full | Time, momentum, and energy resolved pump-probe tunneling spectroscopy of two-dimensional electron systems |
| title_fullStr | Time, momentum, and energy resolved pump-probe tunneling spectroscopy of two-dimensional electron systems |
| title_full_unstemmed | Time, momentum, and energy resolved pump-probe tunneling spectroscopy of two-dimensional electron systems |
| title_short | Time, momentum, and energy resolved pump-probe tunneling spectroscopy of two-dimensional electron systems |
| title_sort | time momentum and energy resolved pump probe tunneling spectroscopy of two dimensional electron systems |
| url | https://doi.org/10.1038/s41467-023-43268-1 |
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