Build-up and dephasing of Floquet–Bloch bands on subcycle timescales

Ito, Suguru; Schüler, Michael; Meierhofer, Manuel; Schlauderer, S.; Freudenstein, Josef; Reimann, J.; Afanasiev, D.; Кох, К. А.; Tereshchenko, O. E.; Güdde, J.; Sentef, Michael A.; Höfer, U.; Huber, Rupert

doi:10.1038/s41586-023-05850-x

Cited by 32 publications

(9 citation statements)

References 58 publications

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“…The reported mechanism enables the lightwave manipulation of trajectory-dependent spin evolution, in which the specific trajectory can be switched on and off on a subcycle time scale, and such phenomenon should also be expected in Rashba-split states and magnetic materials with chiral spin textures. Predictably, the Berry phase and relevant quantities are supposed to play crucial roles in exotic phases of matter out-ofequilibrium [41][42][43] and form an extra control knob in Floquet-engineered topological phases 41 and the transient Hall effect 43 . Exploring the Berry phase effect in quantum many-body systems and non-Abelian Bloch states may further broaden the emergent functions of quantum materials, bringing about device applications such as topological electronics and quantum computation at optical frequencies.…”

Section: Discussionmentioning

confidence: 99%

Probing Berry phase effect in topological surface states

Bai

Jiang

Zheng

et al. 2023

Preprint

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Berry phase and topology of the Bloch wavefunction, originating from the interplay of internal quantum attributes of crystal electrons1, holds great significance in classifying novel quantum phases2,3 and endowing emergent functions4. In quantum materials with broken time-reversal or spatial-inversion symmetry, Bloch electrons in motion necessarily carry a geometric phase, and define the topological states2,3,5 and various quantum and nonlinear Hall effects6,7. Recent advances in light-wave-driven optical harmonic emission enable the observation of the rapid evolution of Bloch electrons on a subcycle time scale 8-13 and empower the harnessing of electron dynamics associated with Berry phase effects14,15. However, the correlation between subcycle electron motion and the accumulation of the quantum phase in geometric aspects of the evolving Bloch waves has not been observed. Here, we demonstrate that the Berry phase can be measured and manipulated in topological surface states using two-colour high-harmonic spectroscopy16. This is achieved by introducing a weak second harmonic field with a precisely controlled time delay to perturb the phase evolution of Dirac fermions and thus provide access to the Berry phase. Furthermore, we observe an overwhelming Berry phase effect that deforms quantum pathways of electron-hole pairs. Our observation demonstrates the ability to harness the electron spin using lightwaves in quantum materials with strong spin-orbit interaction, in addition, enhances the application of light-wave-driven spintronics and topological electronics.

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Section: Discussionmentioning

confidence: 99%

Probing Berry phase effect in topological surface states

Bai

Jiang

Zheng

et al. 2023

Preprint

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“…Therefore, utilization of such field textures in tuning quantum states must be on deep sub-optical cycle time scale, potentially in nonlinear interactions with high field strength. [285,286] Compared with the field textures, vectorial plasmonic spin textures are more robust in space and time. This is because the spin-momentum locking property of surface plasmons requires the spin direction to be associated with the timeindependent plasmonic k-vector, or the energy flow of the plasmonic waves.…”

Section: Structured Spps At Planar Surfacesmentioning

confidence: 99%

Ultrafast photoemission electron microscopy: A multidimensional probe of nonequilibrium physics

Dai 戴

2024

Chinese Phys. B

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Exploring the realms of physics that extend beyond thermal equilibrium has emerged as a crucial branch of condensed matter physics research. It aims to unravel the intricate processes involving the excitations, interactions, and annihilations of quasi- and many-body particles, and ultimately to achieve the manipulation and engineering of exotic non-equilibrium quantum phases on the ultrasmall and ultrafast spatiotemporal scales. Given the inherent complexities arising from many-body dynamics, it therefore seeks for a technique that has efficient and diverse detection degrees of freedoms to study the underlying physics. By combining high-power femtosecond lasers with real- or momentum-space photoemission electron microscopy (PEEM), imaging excited state phenomena from multiple perspectives, including time, real space, energy, momentum, and spin, can be conveniently achieved, making it a unique technique in studying physics out of equilibrium. In this context, we overview the working principle and technical advances of the PEEM apparatus and the related laser systems, and survey key excited-state phenomena probed through this surface-sensitive methodology, including the ultrafast dynamics of electrons, excitons, plasmons, and spins etc., in materials ranging from bulk and nano-structured metals and semiconductors to low dimensional quantum materials. Through this review, one can further envision that time-resolved PEEM will open new avenues for investigating a variety of classical and quantum phenomena in a multidimensional parameter space, offering unprecedented and comprehensive insights to important questions in the field of condensed matter physics.

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“…By changing the relative delay between two lasers, the photoelectron spectrogram contains information of ultrafast processes such as photoionization delay, [46][47][48] temporal phase of attosecond pulse, [49] and photoexcited carrier dynamics. [50] The most well-known APS is attosecond streak camera (ASC) and reconstruction of attosecond beatings by interferences of two-photon transitions (RABBITTs). In 2007, Cavalieri et al [51] gave the first direct observation of attosecond electron transport by ASC in solid tungsten.…”

Section: Attosecond Spectroscopy and Imaging Techniquesmentioning

confidence: 99%

Ultrafast Condensed Matter Physics at Attoseconds

Hu 胡,

Meng 孟

2023

Chinese Phys. Lett.

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Our understanding of how photons couple to different degrees of freedom in solids forms the bedrock of ultrafast physics and materials sciences. In this Perspective, the emergent ultrafast dynamics in condensed matters at the attosecond timescale have been intensively discussed. In particular, the focus is put on recent developments of attosecond dynamics of charge, exciton, and magnetism. New concepts and indispensable role of interactions among multiple degrees of freedom in solids are highlighted. The applications of attosecond electronic metrology and future prospects toward attosecond dynamics in condensed matters are further discussed. These pioneering studies promise the future development of advanced attosecond science and technology such as attosecond lasers, laser medical engineering, and ultrafast electronic devices.

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Build-up and dephasing of Floquet–Bloch bands on subcycle timescales

Cited by 32 publications

References 58 publications

Probing Berry phase effect in topological surface states

Probing Berry phase effect in topological surface states

Ultrafast photoemission electron microscopy: A multidimensional probe of nonequilibrium physics

Ultrafast Condensed Matter Physics at Attoseconds

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