Probing optically driven K₃C₆₀ thin films with an ultrafast voltmeter.

IF 2.3 2区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Structural Dynamics-Us Pub Date : 2025-03-26 eCollection Date: 2025-03-01 DOI:10.1063/4.0000295

J D Adelinia, E Wang, M Chavez-Cervantes, T Matsuyama, M Fechner, M Buzzi, G Meier, A Cavalleri

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引用次数: 0

Abstract

Optically enhanced superconductivity in K₃C₆₀ is supported by transient optical spectra, by pressure responses, and by ultrafast nonlinear transport measurements. However, the underlying physics and in fact the similarity or dissimilarity to most properties of equilibrium superconductivity are not clear. In this paper, we study the ultrafast voltage response of optically driven K₃C₆₀ thin films. Photo-conductive switches are used to measure changes in voltage as a function of time after irradiation, both below and above T_c. These measurements can be understood if one considers the role of granularity in the photo-induced transport response. They reveal fast voltage changes associated with the kinetic inductance of the in-grain carriers and a slower response that may be attributed to Josephson dynamics at the weak links. Fits to the data yield estimates of the in-grain photo-induced superfluid density after the drive and the dynamics of phase slips at the weak links. This work underscores the increasing ability to make electrical measurements at ultrafast speeds in optically driven quantum materials and demonstrates a striking new platform for optoelectronic device applications.

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利用超快电压计探测光驱动 K3C60 薄膜。

瞬态光谱、压力响应和超快非线性输运测量支持了K3C60的光增强超导性。然而，其基本的物理性质以及与大多数平衡超导性质的相似或不同之处尚不清楚。本文研究了光驱动K3C60薄膜的超快电压响应。光导开关用于测量辐照后电压随时间的变化，包括低于和高于Tc的电压。如果考虑颗粒度在光诱导输运响应中的作用，这些测量结果就可以被理解。他们揭示了与颗粒内载流子的动态电感相关的快速电压变化，以及可能归因于薄弱环节约瑟夫森动力学的较慢响应。拟合了驱动后晶粒内光致超流体密度的数据屈服估计和弱环节相滑移动力学。这项工作强调了在光驱动量子材料中以超快速度进行电测量的能力日益增强，并为光电器件应用展示了一个引人注目的新平台。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Structural Dynamics-Us CHEMISTRY, PHYSICALPHYSICS, ATOMIC, MOLECU-PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

CiteScore

5.50

自引率

3.60%

发文量

审稿时长

16 weeks

期刊介绍： Structural Dynamics focuses on the recent developments in experimental and theoretical methods and techniques that allow a visualization of the electronic and geometric structural changes in real time of chemical, biological, and condensed-matter systems. The community of scientists and engineers working on structural dynamics in such diverse systems often use similar instrumentation and methods. The journal welcomes articles dealing with fundamental problems of electronic and structural dynamics that are tackled by new methods, such as: Time-resolved X-ray and electron diffraction and scattering, Coherent diffractive imaging, Time-resolved X-ray spectroscopies (absorption, emission, resonant inelastic scattering, etc.), Time-resolved electron energy loss spectroscopy (EELS) and electron microscopy, Time-resolved photoelectron spectroscopies (UPS, XPS, ARPES, etc.), Multidimensional spectroscopies in the infrared, the visible and the ultraviolet, Nonlinear spectroscopies in the VUV, the soft and the hard X-ray domains, Theory and computational methods and algorithms for the analysis and description of structuraldynamics and their associated experimental signals. These new methods are enabled by new instrumentation, such as: X-ray free electron lasers, which provide flux, coherence, and time resolution, New sources of ultrashort electron pulses, New sources of ultrashort vacuum ultraviolet (VUV) to hard X-ray pulses, such as high-harmonic generation (HHG) sources or plasma-based sources, New sources of ultrashort infrared and terahertz (THz) radiation, New detectors for X-rays and electrons, New sample handling and delivery schemes, New computational capabilities.