Pulling apart photoexcited electrons by photoinducing an in-plane surface electric field

Wong, E Laine; Winchester, Andrew; Madéo, Julien; Man, Michael K. L.; Dani, Keshav M.

doi:10.1126/sciadv.aat9722

Cited by 34 publications

(31 citation statements)

References 36 publications

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“…Measuring circular dichroism in ARPES-accompanied by a predictive theory-thus provides a tool for tracing topological properties in and out of equilibrium in an unprecedented way with full band (and even spatial [77,78]) resolution in real time. More generally, our proposal can be used to detect Berry curvature in nonequilibrium systems even in the absence of a clear Hall response.…”

Section: Summary and Discussionmentioning

confidence: 99%

How Circular Dichroism in Time- and Angle-Resolved Photoemission Can Be Used to Spectroscopically Detect Transient Topological States in Graphene

et al. 2020

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Pumping graphene with circularly polarized light is the archetype of light-tailoring topological bands. Realizing the induced Floquet-Chern-insulator state and demonstrating clear experimental evidence for its topological nature has been a challenge, and it has become clear that scattering effects play a crucial role. We tackle this gap between theory and experiment by employing microscopic quantum kinetic calculations including realistic electron-electron and electron-phonon scattering. Our theory provides a direct link to the build up of the Floquet-Chern-insulator state in light-driven graphene and its detection in time-and angleresolved photoemission spectroscopy (ARPES). This approach allows us to study the robustness of the Floquet features against dephasing and thermalization effects. We also discuss the ultrafast Hall response in the laser-heated state. Furthermore, the induced pseudospin texture and the associated Berry curvature give rise to momentum-dependent orbital magnetization, which is reflected in circular dichroism in ARPES (CD-ARPES). Combining our nonequilibrium calculations with an accurate one-step theory of photoemission allows us to establish a direct link between the build up of the topological state and the dichroic pump-probe photoemission signal. The characteristic features in CD-ARPES are shown to be stable against heating and dephasing effects. Thus, tracing circular dichroism in time-resolved photoemission provides new insights into transient topological properties.

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Section: Summary and Discussionmentioning

confidence: 99%

How Circular Dichroism in Time- and Angle-Resolved Photoemission Can Be Used to Spectroscopically Detect Transient Topological States in Graphene

et al. 2020

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“…In contrast, the time-resolved photoemission electron microscopy (TR-PEEM) method can simultaneously access the evolution of electrons on the time, space, and energy, providing a direct way to image the electrons' behavior at the nanoscale. Recently, the TR-PEEM technique has been applied to image the dynamics of surface plasmon [14][15][16][17][18][19][20][21][22][23] , the transport and recombination of carriers in bulk [24][25][26][27] , atomically thin semiconductors [28][29][30][31] , and vertical type-II semiconductor heterostructure 29 . Lateral modulation of electronic and optical properties of the in-plane structures is necessary for planar devices with high-density integration potentials in modern electronics 10 .…”

mentioning

confidence: 99%

Relaxation and transfer of photoexcited electrons at a coplanar few-layer 1 T′/2H-MoTe2 heterojunction

Liu

et al. 2020

Commun Mater

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Fundamental dynamic processes at the electronic contact interface, such as carrier injection and transport, become pivotal and significantly affect device performance. Time-resolved photoemission electron microscopy (TR-PEEM) with high spatiotemporal resolution provides unprecedented abilities of imaging the electron dynamics at the interface. Here, we implement TR-PEEM to investigate the electron dynamics at a coplanar metallic 1 T′-MoTe 2 /semiconducting 2H-MoTe 2 heterojunction. We find the non-equilibrium electrons in the 1 T′-MoTe 2 possess higher energy than those in the 2H-MoTe 2. The nonequilibrium photoelectrons collapse and relax to the lower energy levels in the order of picoseconds. The photoexcited electrons transfer from 1 T′-MoTe 2 to 2H-MoTe 2 with at a rate of~0.8 × 10 12 s −1 (as fast as 1.25 ps). These findings contribute to our understanding of the behavior of photoexcited electrons in heterojunctions and the design of in-plane optoelectronic devices.

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“…Если говорить о тенденциях в проблеме высокотемпературной сверхпроводимости, то связанные (куперовские) электронные пары в нанокластерных системах определяются новыми механизмами электронной когерентной связи. Она может возникать по нескольким причинам, включая фононные, экситонные/поляритонноэкситонные, магнонные и другие взаимодействия с квазичастицами, а также из-за размерных эффектов [33][34][35][36][37][38][39][40][41]. В последнем случае речь идет о структурах в топологически неоднородной среде в условиях пространственного распределения пустот между заряженными кластерами с различными размерами.…”

Section: Discussionunclassified

Топологические Лазерно Индуцированные Квантовые Состояния В Нанокластерных Структурах: Фундаментальные Эффекты И Возможные Применения (Электрофизика И Оптика)

Аракелян¹,

Худаберганов²,

Истратов³

et al. 2019

Журнал Технической Физики

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Laser-induced nanocluster structures of different types (in topology and in elemental compositions of noble metal/carbon, bimetals, semiconductors, etc.) are studied theoretically and experimentally with allowance for the correlations in an ensemble of nanoparticles with quantum size states. The problem of high-temperature superconductivity (in the form of a sharp decrease in electrical resistivity) caused by topological surface structures leading to bound states of electrons based on new dimensional principles is discussed.

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Pulling apart photoexcited electrons by photoinducing an in-plane surface electric field

Abstract: We make a movie, on the nanometer and femtosecond scale, as we pull apart electrons with a photoinduced surface field.

Cited by 34 publications

References 36 publications

How Circular Dichroism in Time- and Angle-Resolved Photoemission Can Be Used to Spectroscopically Detect Transient Topological States in Graphene

How Circular Dichroism in Time- and Angle-Resolved Photoemission Can Be Used to Spectroscopically Detect Transient Topological States in Graphene

Relaxation and transfer of photoexcited electrons at a coplanar few-layer 1 T′/2H-MoTe2 heterojunction

Топологические Лазерно Индуцированные Квантовые Состояния В Нанокластерных Структурах: Фундаментальные Эффекты И Возможные Применения (Электрофизика И Оптика)

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