Observation of terahertz-induced magnetooscillations in graphene.

Observation of terahertz-induced magnetooscillations in graphene.
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石墨烯中太赫兹引起的磁振荡的观察

DOI:
10.1021/acs.nanolett.0c01918
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发表时间:
2020
期刊:
影响因子:
10.8
通讯作者:
S. D. Ganichev
S. D. Ganichev
中科院分区:
材料科学1区
文献类型:
--
作者:
E. Mönch;D. A. Bandurin;I. A. Dmitriev;I.Y. Phinney;I. Yahniuk;T. Taniguchi;K. Watanabe;P. Jarillo-Herrero;S. D. Ganichev

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当高频辐射入射到经受垂直磁场的石墨烯上时,石墨烯通过允许最近的朗道能级之间的跃迁来吸收入射光子,所述朗道能级遵循由角动量守恒规定的严格选择规则。在这里,我们在暴露于太赫兹(THz)辐射的高质量石墨烯器件中显示了这种行为的定性偏差。我们证明了一个明显的太赫兹驱动的光响应的出现,表现出低场磁振荡的入射辐射的频率和准经典回旋频率的比率。我们分析了所产生的光电压与辐射频率和载流子密度的修改,并表明所观察到的光响应与GaAs基异质结构中发现的微波诱导的电阻振荡具有共同的起源;然而,在石墨烯中,它出现在更高的频率并持续高于液氮温度。我们的观察扩展了石墨烯中辐射驱动现象的家族,为未来非平衡电子输运的研究铺平了道路。
When high-frequency radiation is incident upon graphene subjected to a perpendicular magnetic field, graphene absorbs incident photons by allowing transitions between nearest Landau levels that follow strict selection rules dictated by angular momentum conservation. Here, we show a qualitative deviation from this behavior in high-quality graphene devices exposed to terahertz (THz) radiation. We demonstrate the emergence of a pronounced THz-driven photoresponse, which exhibits low-field magnetooscillations governed by the ratio of the frequency of the incoming radiation and the quasiclassical cyclotron frequency. We analyze the modifications of generated photovoltage with the radiation frequency and carrier density and demonstrate that the observed photoresponse shares a common origin with microwave-induced resistance oscillations discovered in GaAs-based heterostructures; however, in graphene it appears at much higher frequencies and persists above liquid nitrogen temperatures. Our observations expand the family of radiation-driven phenomena in graphene, paving the way for future studies of nonequilibrium electron transport.
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