Ultrafast-induced coherent acoustic phonons in the two-dimensional magnet CrSBr
Magnetism in two-dimensional (2D) van der Waals (vdW) crystals offers promising new directions for low-dimensional physics and devices. In this work, mega-electron volt (MeV) ultrafast electron diffraction was employed to investigate the ultrafast atomic dynamics of a novel, 2D vdW magnetic single-c...
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC and ACA
2025-03-01
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| Series: | Structural Dynamics |
| Online Access: | http://dx.doi.org/10.1063/4.0000266 |
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| author | Jayajeewana N. Ranhili Sumit Khadka Junjie Li John Cenker Alberto M. Ruiz Andrei Shumilin José J. Baldoví Ka Shen Mikhail Fedurin Mark Palmer Daniel G. Chica Paul Byaruhanga Shuo Chen Xiaodong Xu Xavier Roy Byron Freelon |
| author_facet | Jayajeewana N. Ranhili Sumit Khadka Junjie Li John Cenker Alberto M. Ruiz Andrei Shumilin José J. Baldoví Ka Shen Mikhail Fedurin Mark Palmer Daniel G. Chica Paul Byaruhanga Shuo Chen Xiaodong Xu Xavier Roy Byron Freelon |
| author_sort | Jayajeewana N. Ranhili |
| collection | DOAJ |
| description | Magnetism in two-dimensional (2D) van der Waals (vdW) crystals offers promising new directions for low-dimensional physics and devices. In this work, mega-electron volt (MeV) ultrafast electron diffraction was employed to investigate the ultrafast atomic dynamics of a novel, 2D vdW magnetic single-crystal CrSBr. Femtosecond (fs) optical pump pulses excited non-equilibrium atomic displacements shown to be coherent acoustic phonons (CAPs). Phonon frequencies were extracted by analyzing oscillations of different Bragg peak (BP) intensities and were determined to be GHz acoustic disturbances that propagated as strain waves. Phonon modes exhibit anisotropy with respect to the a and b crystal axes. Subharmonic phonon frequencies were also observed, and this provided a signature of nonlinear oscillatory coupling between the laser-induced pumping phonon frequency and secondary phonon frequencies. Thus, CrSBr was found to serve as a nonlinear phononic frequency converter. The ultrafast time dependence of the Bragg intensity was simulated by incorporating an oscillating deviation parameter ansatz into expressions for the dynamical scattering intensity yielded excellent modeling of the ultrafast structural dynamics of the photo-excited 2D crystal. Our work provides a foundation for exploring how fs light pulses can influence phonon dynamics in materials with strong spin-lattice coupling. These results suggest that CAPs can match the magnon frequencies and show the promise of CrSBr for use in optical-to-microwave transducers and phononic devices. |
| format | Article |
| id | doaj-art-171ac2fedcb14cae981a98f2bd166d64 |
| institution | OA Journals |
| issn | 2329-7778 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | AIP Publishing LLC and ACA |
| record_format | Article |
| series | Structural Dynamics |
| spelling | doaj-art-171ac2fedcb14cae981a98f2bd166d642025-08-20T02:11:09ZengAIP Publishing LLC and ACAStructural Dynamics2329-77782025-03-01122024501024501-1110.1063/4.0000266Ultrafast-induced coherent acoustic phonons in the two-dimensional magnet CrSBrJayajeewana N. Ranhili0Sumit Khadka1Junjie Li2John Cenker3Alberto M. Ruiz4Andrei Shumilin5José J. Baldoví6Ka Shen7Mikhail Fedurin8Mark Palmer9Daniel G. Chica10Paul Byaruhanga11Shuo Chen12Xiaodong Xu13Xavier Roy14Byron Freelon15Physics Department and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USAPhysics Department and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USAAccelerator Test Facility, Brookhaven National Laboratory, Upton, New York 11973, USAPhysics Department, University of Washington, Seattle, Washington 98195, USAInstituto de Ciencia Molecular (ICMol), University of Valencia, Valencia, SpainInstituto de Ciencia Molecular (ICMol), University of Valencia, Valencia, SpainInstituto de Ciencia Molecular (ICMol), University of Valencia, Valencia, SpainThe Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, ChinaAccelerator Test Facility, Brookhaven National Laboratory, Upton, New York 11973, USAAccelerator Test Facility, Brookhaven National Laboratory, Upton, New York 11973, USAChemistry Department, Columbia University, New York, New York 10027, USAPhysics Department and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USAPhysics Department and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USAPhysics Department, University of Washington, Seattle, Washington 98195, USAChemistry Department, Columbia University, New York, New York 10027, USAPhysics Department and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USAMagnetism in two-dimensional (2D) van der Waals (vdW) crystals offers promising new directions for low-dimensional physics and devices. In this work, mega-electron volt (MeV) ultrafast electron diffraction was employed to investigate the ultrafast atomic dynamics of a novel, 2D vdW magnetic single-crystal CrSBr. Femtosecond (fs) optical pump pulses excited non-equilibrium atomic displacements shown to be coherent acoustic phonons (CAPs). Phonon frequencies were extracted by analyzing oscillations of different Bragg peak (BP) intensities and were determined to be GHz acoustic disturbances that propagated as strain waves. Phonon modes exhibit anisotropy with respect to the a and b crystal axes. Subharmonic phonon frequencies were also observed, and this provided a signature of nonlinear oscillatory coupling between the laser-induced pumping phonon frequency and secondary phonon frequencies. Thus, CrSBr was found to serve as a nonlinear phononic frequency converter. The ultrafast time dependence of the Bragg intensity was simulated by incorporating an oscillating deviation parameter ansatz into expressions for the dynamical scattering intensity yielded excellent modeling of the ultrafast structural dynamics of the photo-excited 2D crystal. Our work provides a foundation for exploring how fs light pulses can influence phonon dynamics in materials with strong spin-lattice coupling. These results suggest that CAPs can match the magnon frequencies and show the promise of CrSBr for use in optical-to-microwave transducers and phononic devices.http://dx.doi.org/10.1063/4.0000266 |
| spellingShingle | Jayajeewana N. Ranhili Sumit Khadka Junjie Li John Cenker Alberto M. Ruiz Andrei Shumilin José J. Baldoví Ka Shen Mikhail Fedurin Mark Palmer Daniel G. Chica Paul Byaruhanga Shuo Chen Xiaodong Xu Xavier Roy Byron Freelon Ultrafast-induced coherent acoustic phonons in the two-dimensional magnet CrSBr Structural Dynamics |
| title | Ultrafast-induced coherent acoustic phonons in the two-dimensional magnet CrSBr |
| title_full | Ultrafast-induced coherent acoustic phonons in the two-dimensional magnet CrSBr |
| title_fullStr | Ultrafast-induced coherent acoustic phonons in the two-dimensional magnet CrSBr |
| title_full_unstemmed | Ultrafast-induced coherent acoustic phonons in the two-dimensional magnet CrSBr |
| title_short | Ultrafast-induced coherent acoustic phonons in the two-dimensional magnet CrSBr |
| title_sort | ultrafast induced coherent acoustic phonons in the two dimensional magnet crsbr |
| url | http://dx.doi.org/10.1063/4.0000266 |
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