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yexuqing木蟲之王 (文學泰斗)
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光驅(qū)動YBa2Cu3O6.48的磁場驅(qū)逐
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光驅(qū)動YBa2Cu3O6.48的磁場驅(qū)逐 ▲ 作者：S. Fava, G. De Vecchi, G. Jotzu, M. Buzzi, T. Gebert, Y. Liu, B. Keimer & A. Cavalleri ▲鏈接： https://www.nature.com/articles/s41586-024-07635-2 ▲摘要： 量子固體中的相干光驅(qū)動正在成為一個研究前沿，有許多有趣的非平衡量子相和瞬態(tài)光致功能現(xiàn)象的報道，如鐵電性、磁性和超導(dǎo)性。在高溫銅超導(dǎo)體中，某些聲子模式的相干驅(qū)動導(dǎo)致了具有類似超導(dǎo)光學性質(zhì)的瞬態(tài)，遠遠高于它們的轉(zhuǎn)變溫度Tc，并且貫穿贗隙相。 然而，關(guān)于這種瞬態(tài)的微觀性質(zhì)以及如何將其與具有增強載流子遷移率的非超導(dǎo)狀態(tài)區(qū)分開來的問題仍然存在。例如，目前尚不清楚在這種時尚中驅(qū)動的銅是否表現(xiàn)出邁斯納抗磁性。 研究者通過測量放置在樣品附近的磁光材料中的法拉第旋轉(zhuǎn)來研究光驅(qū)動YBa2Cu3O6.48晶體周圍的時間相關(guān)磁場。在恒定的外加磁場和相同的驅(qū)動條件下，產(chǎn)生類似超導(dǎo)的光學特性，觀察到瞬態(tài)抗磁響應(yīng)。 這種響應(yīng)在尺寸上與具有相似形狀和尺寸的平衡型II超導(dǎo)體的響應(yīng)相當，其體積磁化率χv為?0.3階。這個值與光誘導(dǎo)的沒有超導(dǎo)性的遷移率增加是不相容的。相反，它強調(diào)了贗隙相的概念，其中早期的超導(dǎo)相關(guān)性被驅(qū)動器增強或同步。 ▲ Abstract： Coherent optical driving in quantum solids is emerging as a research frontier, with many reports of interesting non-equilibrium quantum phases and transient photo-induced functional phenomena such as ferroelectricity, magnetism and superconductivity. In high-temperature cuprate superconductors, coherent driving of certain phonon modes has resulted in a transient state with superconducting-like optical properties, observed far above their transition temperature Tc and throughout the pseudogap phase. However, questions remain on the microscopic nature of this transient state and how to distinguish it from a non-superconducting state with enhanced carrier mobility. For example, it is not known whether cuprates driven in this fashion exhibit Meissner diamagnetism. Here we examine the time-dependent magnetic field surrounding an optically driven YBa2Cu3O6.48 crystal by measuring Faraday rotation in a magneto-optic material placed in the vicinity of the sample. For a constant applied magnetic field and under the same driving conditions that result in superconducting-like optical properties, a transient diamagnetic response was observed. This response is comparable in size with that expected in an equilibrium type II superconductor of similar shape and size with a volume susceptibility χv of order ?0.3. This value is incompatible with a photo-induced increase in mobility without superconductivity. Rather, it underscores the notion of a pseudogap phase in which incipient superconducting correlations are enhanced or synchronized by the drive. |
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