Exciton-assisted low-energy magnetic excitations in a photoexcited Mott insulator on a square lattice
Exciton-assisted low-energy magnetic excitations in a photoexcited Mott insulator on a square lattice
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方形晶格上光激发莫特绝缘体中激子辅助的低能磁激发
DOI：
10.1038/s42005-023-01158-4
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发表时间：
2023
影响因子：
5.5
通讯作者：
Tohyama Takami
中科院分区：
文献类型：
--
作者：
Tsutsui Kenji;Shinjo Kazuya;Sota Shigetoshi;Tohyama Takami
在时间分辨共振-非弹性x射线散射和时间分辨拉曼散射中观察到，方形晶格上Mott绝缘体的光激发分别减弱了单磁振子和双磁振子的激发强度。然而，在磁振子以下的低能区域的光谱变化还没有被清楚地理解。为了揭示Mott绝缘体的光致低能磁激发的本质，我们在方形晶格上对光激发半填充Hubbard模型中的瞬态磁动力学进行了数值研究。在关闭为吸收边缘调谐的泵浦脉冲后，在单磁振子和双磁振子激发下，新的磁信号明显低于磁振子能量。我们发现低能激发主要是通过吸收边的激子态产生的。这些激子辅助磁激发可能为最近在绝缘YBa2Cu3O6.1上进行的时间分辨双磁振子拉曼散射实验中的低能谱重提供了可能的解释。
The photoexcitation of a Mott insulator on a square lattice weakens the intensity of both single- and two-magnon excitations as observed in time-resolved resonant-inelastic X-ray scattering and time-resolved Raman scattering, respectively. However, the spectral changes in the low-energy regions below the magnons have not yet been clearly understood. To uncover the nature of the photoinduced low-energy magnetic excitations of the Mott insulator, we numerically investigate the transient magnetic dynamics in a photoexcited half-filled Hubbard model on a square lattice. After turning off a pump pulse tuned for an absorption edge, new magnetic signals clearly emerge well below the magnon energy in both single- and two-magnon excitations. We find that low-energy excitations are predominantly created via excitonic states at the absorption edge. These exciton-assisted magnetic excitations may provide a possible explanation for the low-energy spectral weight in a recent time-resolved two-magnon Raman scattering experiment on insulating YBa2Cu3O6.1.
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DOI：
10.1073/pnas.2103696118
发表时间：
2020-02
期刊：
Proceedings of the National Academy of Sciences
影响因子：
--
作者：
D. Mazzone;D. Meyers;Yue Cao;J. G. Vale;C. D. Dashwood;Youguo Shi;A. James;N. Robinson;Jiaqi Lin;V. Thampy;Yoshikazu Tanaka;Allan S. Johnson;H. Miao;Ruitang Wang;Tadesse A. Assefa;Jungho Kim;D. Casa;R. Mankowsky;D. Zhu;R. Alonso-Mori;Sanghoon Song;H. Yavas;T. Katayama;M. Yabashi;Y. Kubota;S. Owada;Jian Liu;Junji Yang;R. Konik;I. Robinson;John P. Hill;D. McMorrow;M. Först;S. Wall;Xuerong Liu;M. Dean
通讯作者：
D. Mazzone;D. Meyers;Yue Cao;J. G. Vale;C. D. Dashwood;Youguo Shi;A. James;N. Robinson;Jiaqi Lin;V. Thampy;Yoshikazu Tanaka;Allan S. Johnson;H. Miao;Ruitang Wang;Tadesse A. Assefa;Jungho Kim;D. Casa;R. Mankowsky;D. Zhu;R. Alonso-Mori;Sanghoon Song;H. Yavas;T. Katayama;M. Yabashi;Y. Kubota;S. Owada;Jian Liu;Junji Yang;R. Konik;I. Robinson;John P. Hill;D. McMorrow;M. Först;S. Wall;Xuerong Liu;M. Dean
光激发二维莫特绝缘体时间分辨自旋结构因子中的反相振荡
DOI：
--
发表时间：
2021
期刊：
影响因子：
--
作者：
藤原孝将;深田幸正;清宮僚人;亀井朝日;鈴木孝義;池田直;T. Tohyama
通讯作者：
T. Tohyama
影响因子：
35
作者：
Batignani, G.;Bossini, D.;Scopigno, T.
通讯作者：
Scopigno, T.
影响因子：
3.7
作者：
Bowlan, P.;Trugman, S. A.;Prasankumar, R. P.
通讯作者：
Prasankumar, R. P.
影响因子：
16.6
作者：
Yang, Jhih-An;Pellatz, Nicholas;Reznik, Dmitry
通讯作者：
Reznik, Dmitry