Extended high-harmonic spectra through a cascade resonance in confined quantum systems
The study of high-harmonic generation in confined quantum systems is vital to establishing a complete physical picture of harmonic generation from atoms and molecules to bulk solids. Based on a multilevel approach, we demonstrate how intraband resonances significantly influence the harmonic spectra...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2022-07-01
|
| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.4.033026 |
| _version_ | 1797210725222973440 |
|---|---|
| author | Xiao Zhang Tao Zhu Hongchuan Du Hong-Gang Luo Jeroen van den Brink Rajyavardhan Ray |
| author_facet | Xiao Zhang Tao Zhu Hongchuan Du Hong-Gang Luo Jeroen van den Brink Rajyavardhan Ray |
| author_sort | Xiao Zhang |
| collection | DOAJ |
| description | The study of high-harmonic generation in confined quantum systems is vital to establishing a complete physical picture of harmonic generation from atoms and molecules to bulk solids. Based on a multilevel approach, we demonstrate how intraband resonances significantly influence the harmonic spectra via charge pumping to the higher subbands and thus redefine the cutoff laws. As a proof of principle, we consider the interaction of graphene nanoribbons, with zigzag as well as armchair terminations, and resonant fields polarized along the cross-ribbon direction. Here, this effect is particularly prominent due to many nearly equiseparated energy levels. In such a scenario, a cascade resonance effect can take place in high-harmonic generation when the field strength is above a critical threshold, which is completely different from the harmonic generation mechanism of atoms, molecules, and bulk solids. We further discuss the implications not only for other systems in a nanoribbon geometry, but also systems where only a few subbands (energy levels) meet this frequency-matching condition by considering a generalized multilevel Hamiltonian. Our study highlights that cascade resonance has a fundamentally distinct influence on the laws of harmonic generation, specifically the cutoff laws based on laser duration, field strength, and wavelength, thus unraveling additional insights in solid-state high-harmonic generation. |
| first_indexed | 2024-04-24T10:15:09Z |
| format | Article |
| id | doaj.art-6ceb02e899f74cc0a846ad380a7036a6 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:15:09Z |
| publishDate | 2022-07-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-6ceb02e899f74cc0a846ad380a7036a62024-04-12T17:22:40ZengAmerican Physical SocietyPhysical Review Research2643-15642022-07-014303302610.1103/PhysRevResearch.4.033026Extended high-harmonic spectra through a cascade resonance in confined quantum systemsXiao ZhangTao ZhuHongchuan DuHong-Gang LuoJeroen van den BrinkRajyavardhan RayThe study of high-harmonic generation in confined quantum systems is vital to establishing a complete physical picture of harmonic generation from atoms and molecules to bulk solids. Based on a multilevel approach, we demonstrate how intraband resonances significantly influence the harmonic spectra via charge pumping to the higher subbands and thus redefine the cutoff laws. As a proof of principle, we consider the interaction of graphene nanoribbons, with zigzag as well as armchair terminations, and resonant fields polarized along the cross-ribbon direction. Here, this effect is particularly prominent due to many nearly equiseparated energy levels. In such a scenario, a cascade resonance effect can take place in high-harmonic generation when the field strength is above a critical threshold, which is completely different from the harmonic generation mechanism of atoms, molecules, and bulk solids. We further discuss the implications not only for other systems in a nanoribbon geometry, but also systems where only a few subbands (energy levels) meet this frequency-matching condition by considering a generalized multilevel Hamiltonian. Our study highlights that cascade resonance has a fundamentally distinct influence on the laws of harmonic generation, specifically the cutoff laws based on laser duration, field strength, and wavelength, thus unraveling additional insights in solid-state high-harmonic generation.http://doi.org/10.1103/PhysRevResearch.4.033026 |
| spellingShingle | Xiao Zhang Tao Zhu Hongchuan Du Hong-Gang Luo Jeroen van den Brink Rajyavardhan Ray Extended high-harmonic spectra through a cascade resonance in confined quantum systems Physical Review Research |
| title | Extended high-harmonic spectra through a cascade resonance in confined quantum systems |
| title_full | Extended high-harmonic spectra through a cascade resonance in confined quantum systems |
| title_fullStr | Extended high-harmonic spectra through a cascade resonance in confined quantum systems |
| title_full_unstemmed | Extended high-harmonic spectra through a cascade resonance in confined quantum systems |
| title_short | Extended high-harmonic spectra through a cascade resonance in confined quantum systems |
| title_sort | extended high harmonic spectra through a cascade resonance in confined quantum systems |
| url | http://doi.org/10.1103/PhysRevResearch.4.033026 |
| work_keys_str_mv | AT xiaozhang extendedhighharmonicspectrathroughacascaderesonanceinconfinedquantumsystems AT taozhu extendedhighharmonicspectrathroughacascaderesonanceinconfinedquantumsystems AT hongchuandu extendedhighharmonicspectrathroughacascaderesonanceinconfinedquantumsystems AT honggangluo extendedhighharmonicspectrathroughacascaderesonanceinconfinedquantumsystems AT jeroenvandenbrink extendedhighharmonicspectrathroughacascaderesonanceinconfinedquantumsystems AT rajyavardhanray extendedhighharmonicspectrathroughacascaderesonanceinconfinedquantumsystems |