Ultrafast excitation provides a route to generate and probe novel states not accessible in equilibrium. In the 1D cuprate Sr2CuO3, time-resolved XAS reveals that ultrafast excitation induces a non-equilibrium hole distribution, reminiscent of the Zhang-Rice Singlet states observed in hole-doped 2D cuprates. RIXS at the Cu L-edge reveals a corresponding transient reduction in the 2-spinon spectral weight, consistent with the creation of holon-doublons. O K-edge RIXS reveals an emergent charge excitation, present only in the light-induced state and absent in equilibrium. These charge excitations are particularly unique, as conducting 1D systems have been difficult to realize in equilibrium. Thus ultrafast excitation in Sr2CuO3 provides a promising route for probing non-equilibrium fractionalized charge excitations and exotic physics.
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Publication:1. S. F. R. TenHuisen, Z. Shen, A. K. Jones, V. Menon, H. Padma, Z. Guan, F. Glerean, P. B. M. de Oliveira, W. He, V. Bhartiya, A. Roll, G. Gu, J. Li, S. Parchenko, G. Mercurio, L. Le Guyader, B. van Kuiken, T. C. Asmara, S. Tippireddy, J. Choi, M. Garcia-Fernandez, J. Pelliciari, V. Bisogni, A. Scherz, Y. Wang, M. P. M. Dean, and M. Mitrano. X-ray detection of multipartite entanglement in and out-of-equilibrium in a quantum spin chain, forthcoming.
2. A. K. Jones*, S. F. R. TenHuisen*, D. Baykusheva, F. Glerean, P. B. M. de Oliveira, H. Padma, Z. Guan, T. Meng, T. C. Asmara, B. Lee, D. Jost, L. Shen, G. Coslovich, A. Mehta, E. Skoropata, H. Ueda, B. Liu, E. Paris, A. Romaguera, S. Parchenko, G. Mercurio, L. Le Guyader, B. van Kuiken, G. Dakovski, E. Razzoli, H. Jang, A. Scherz, Y. Wang, M. P. M. Dean, M. Mitrano. Light-induced Luttinger plasmons in a 1D cuprate spin chain, forthcoming.