Ultrafast formation of topological defects in a 2D charge density wave
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2022
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866916120063115264 |
|---|---|
| author | Cheng, Yun Zong, Alfred Wu, Lijun Meng, Qingping Xia, Wei Qi, Fengfeng Zhu, Pengfei Zou, Xiao Jiang, Tao Guo, Yanfeng van Wezel, Jasper Kogar, Anshul Zuerch, Michael W. Zhang, Jie Zhu, Yimei Xiang, Dao |
| author_facet | Cheng, Yun Zong, Alfred Wu, Lijun Meng, Qingping Xia, Wei Qi, Fengfeng Zhu, Pengfei Zou, Xiao Jiang, Tao Guo, Yanfeng van Wezel, Jasper Kogar, Anshul Zuerch, Michael W. Zhang, Jie Zhu, Yimei Xiang, Dao |
| contents | Topological defects play a key role in nonequilibrium phase transitions, ranging from birth of the early universe to quantum critical behavior of ultracold atoms. In solids, transient defects are known to generate a variety of hidden orders not accessible in equilibrium, but how defects are formed at the nanometer lengthscale and femtosecond timescale remains unknown. Here, we employ an intense laser pulse to create topological defects in a 2D charge density wave, and track their morphology and dynamics with ultrafast electron diffraction. Leveraging its high temporal resolution and sensitivity in detecting weak diffuse signals, we discover a dual-stage growth of 1D domain walls within 1 ps, a process not dictated by the order parameter amplitude but instead mediated by a nonthermal population of longitudinal optical phonons. Our work provides a framework for ultrafast engineering of topological defects based on selective excitation of collective modes, opening new avenues for dynamical control of nonequilibrium phases in correlated materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2211_05748 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Ultrafast formation of topological defects in a 2D charge density wave Cheng, Yun Zong, Alfred Wu, Lijun Meng, Qingping Xia, Wei Qi, Fengfeng Zhu, Pengfei Zou, Xiao Jiang, Tao Guo, Yanfeng van Wezel, Jasper Kogar, Anshul Zuerch, Michael W. Zhang, Jie Zhu, Yimei Xiang, Dao Materials Science Strongly Correlated Electrons Topological defects play a key role in nonequilibrium phase transitions, ranging from birth of the early universe to quantum critical behavior of ultracold atoms. In solids, transient defects are known to generate a variety of hidden orders not accessible in equilibrium, but how defects are formed at the nanometer lengthscale and femtosecond timescale remains unknown. Here, we employ an intense laser pulse to create topological defects in a 2D charge density wave, and track their morphology and dynamics with ultrafast electron diffraction. Leveraging its high temporal resolution and sensitivity in detecting weak diffuse signals, we discover a dual-stage growth of 1D domain walls within 1 ps, a process not dictated by the order parameter amplitude but instead mediated by a nonthermal population of longitudinal optical phonons. Our work provides a framework for ultrafast engineering of topological defects based on selective excitation of collective modes, opening new avenues for dynamical control of nonequilibrium phases in correlated materials. |
| title | Ultrafast formation of topological defects in a 2D charge density wave |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2211.05748 |