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Bandgap control in two-dimensional semiconductors via coherent doping of plasmonic hot electrons.


ABSTRACT: Bandgap control is of central importance for semiconductor technologies. The traditional means of control is to dope the lattice chemically, electrically or optically with charge carriers. Here, we demonstrate a widely tunable bandgap (renormalisation up to 550 meV at room-temperature) in two-dimensional (2D) semiconductors by coherently doping the lattice with plasmonic hot electrons. In particular, we integrate tungsten-disulfide (WS2) monolayers into a self-assembled plasmonic crystal, which enables coherent coupling between semiconductor excitons and plasmon resonances. Accompanying this process, the plasmon-induced hot electrons can repeatedly fill the WS2 conduction band, leading to population inversion and a significant reconstruction in band structures and exciton relaxations. Our findings provide an effective measure to engineer optical responses of 2D semiconductors, allowing flexibilities in design and optimisation of photonic and optoelectronic devices.

SUBMITTER: Chen YH 

PROVIDER: S-EPMC8282635 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature

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Bandgap control in two-dimensional semiconductors via coherent doping of plasmonic hot electrons.

Chen Yu-Hui YH   Tamming Ronnie R RR   Chen Kai K   Zhang Zhepeng Z   Liu Fengjiang F   Zhang Yanfeng Y   Hodgkiss Justin M JM   Blaikie Richard J RJ   Ding Boyang B   Qiu Min M  

Nature communications 20210715 1


Bandgap control is of central importance for semiconductor technologies. The traditional means of control is to dope the lattice chemically, electrically or optically with charge carriers. Here, we demonstrate a widely tunable bandgap (renormalisation up to 550 meV at room-temperature) in two-dimensional (2D) semiconductors by coherently doping the lattice with plasmonic hot electrons. In particular, we integrate tungsten-disulfide (WS<sub>2</sub>) monolayers into a self-assembled plasmonic crys  ...[more]

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