Coherent Modulation of Two-Dimensional Moiré States with On-Chip THz Waves
arxiv(2024)
摘要
Van der Waals (vdW) structures of two-dimensional materials host a broad
range of physical phenomena. New opportunities arise if different functional
layers may be remotely modulated or coupled in a device structure. Here we
demonstrate the in-situ coherent modulation of moiré excitons and correlated
Mott insulators in transition metal dichalcogenide (TMD) homo- or
hetero-bilayers with on-chip terahertz (THz) waves. Using common dual-gated
device structures, each consisting of a TMD moiré bilayer sandwiched between
two few-layer graphene (fl-Gr) gates with hexagonal boron nitride (h-BN)
spacers, we launch coherent phonon wavepackets at 0.4-1 THz from the fl-Gr
gates by femtosecond laser excitation. The waves travel through the h-BN
spacer, arrive at the TMD bilayer with precise timing, and coherently modulate
the moiré excitons or the Mott states. These results demonstrate that the
fl-Gr gates, often used for electrical control of the material properties, can
serve as effective on-chip opto-elastic transducers to generate THz waves for
the coherent control and vibrational entanglement of functional layers in
commonly used moiré devices.
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