Optical manipulation of electronic dimensionality in a quantum material

Duan, Shaofeng; Cheng, Yun; Xia, Wei; Yang, Yuanyuan; Xu, Chengyang; Qi, Fengfeng; Huang, Chaozhi; Tang, Tian-wei; Guo, Yanfeng; Luo, Weidong; Qian, Dong; Xiang, Dao; Zhang, Jie; Zhang, Wentao

doi:10.1038/s41586-021-03643-8

Cited by 72 publications

(57 citation statements)

References 53 publications

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“…At F c , there is a complete suppression of a special type of superlattice peaks 17 , which are space-group forbidden and can only be observed if excitonic correlations are present. Time-resolved optical reflectivity and photoemission also demonstrate a similar threshold at F c in the valence band shift and carrier relaxation rate, both of which are sensitive to the excitonic order 29,30 . All of these observations point towards a critical free carrier density at F c , above which excitonic correlations transiently disappear.…”

mentioning

confidence: 76%

“…The existence of a fluence threshold is unexpected from equilibrium considerations, where a temperature increase towards T c continuously strengthens CDW fluctuations 27 . As the initial effect of photoexcitation I) 16,17,28,29 . In time-resolved terahertz spectroscopy, a plasmon pole in the energy loss function is significantly modified above F c , suggesting that photoexcitation has transiently melted the exciton condensate 16 .…”

mentioning

confidence: 99%

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Light-induced dimension crossover in 1T-TiSe$_2$ dictated by excitonic correlations

Cheng,

Zong,

et al. 2022

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confidence: 76%

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confidence: 99%

Light-induced dimension crossover in 1T-TiSe$_2$ dictated by excitonic correlations

Cheng,

Zong,

et al. 2022

Preprint

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“…The potential minimum evolves continuously with excitation until it reaches zero, while simultaneously softening, leading to critical slowing down of the OP dynamics 11 . At higher fluences, the potential minimum is fixed at the high-symmetry point, but the potential can still change and the OP can evolve coherently such that the system can overshoot and cross-over from one ordered domain to another, with an OP of opposite sign 10 , 12 , 13 and oscillates about the high-symmetry state. Such underdamped and coherent systems are amenable to coherent control 14 , and this formulation has been applied to a range of systems, including the manganites 15 , suggesting a universal behaviour in quantum materials and a way to realize non-thermal states.…”

Section: Introductionmentioning

confidence: 99%

Multi-mode excitation drives disorder during the ultrafast melting of a C4-symmetry-broken phase

et al. 2022

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Spontaneous C4-symmetry breaking phases are ubiquitous in layered quantum materials, and often compete with other phases such as superconductivity. Preferential suppression of the symmetry broken phases by light has been used to explain non-equilibrium light induced superconductivity, metallicity, and the creation of metastable states. Key to understanding how these phases emerge is understanding how C4 symmetry is restored. A leading approach is based on time-dependent Ginzburg-Landau theory, which explains the coherence response seen in many systems. However, we show that, for the case of the single layered manganite La0.5Sr1.5MnO4, the theory fails. Instead, we find an ultrafast inhomogeneous disordering transition in which the mean-field order parameter no longer reflects the atomic-scale state of the system. Our results suggest that disorder may be common to light-induced phase transitions, and methods beyond the mean-field are necessary for understanding and manipulating photoinduced phases.

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“…Topological defects within the CDW phase were also invoked in other contexts in Refs. [20][21][22][23][24][25][26][27].…”

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confidence: 99%

Dynamics of topological defects after a photo-induced melting of a charge-density wave

Tarkhov¹,

Rozhkov²,

Zong³

et al. 2022

Preprint

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Charge-density-wave order in a solid can be temporarily "melted" by a strong laser pulse. Here we use the discrete Gross-Pitaevskii equation on a cubic lattice to simulate the recovery of the CDW long-range phase coherence following such a pulse. Our simulations indicate that the recovery process is dramatically slowed down by the three-dimensional topological defects -CDW dislocations -created as a result of strongly nonequilibrium heating and cooling of the system. Overall, the simulated CDW recovery was found to be strongly reminiscent of a recent pump-probe experiment in LaTe3.

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Optical manipulation of electronic dimensionality in a quantum material

Cited by 72 publications

References 53 publications

Light-induced dimension crossover in 1T-TiSe$_2$ dictated by excitonic correlations

Light-induced dimension crossover in 1T-TiSe$_2$ dictated by excitonic correlations

Multi-mode excitation drives disorder during the ultrafast melting of a C4-symmetry-broken phase

Dynamics of topological defects after a photo-induced melting of a charge-density wave

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