Combining THz and Infrared Light to Control Valley Charge and Current in Gapless Graphene.

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Tác giả: John Kay Dewhurst, Peter Elliott, Deepika Gill, Jyoti Krishna, Samuel Shallcross, Sangeeta Sharma

Ngôn ngữ: eng

Ký hiệu phân loại: 133.594 Types or schools of astrology originating in or associated with a

Thông tin xuất bản: United States : Nano letters , 2025

Mô tả vật lý:

Bộ sưu tập: NCBI

ID: 691889

The absence of a selection rule coupling oppositely circularly polarized light to conjugate valleys, the basis of "lightwave valleytronics", would appear to curtail the possibilities of graphene as a valleytronic platform. Here we show that combining linearly polarized THz light and circularly polarized infrared light allows not only near perfect valley charge polarization but also complete light control over the associated valley current. The underlying mechanism involves a THz induced momentum space shift of valley uncontrasted charge generated by the circularly polarized component, yielding charge at the K and Γ points.
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