The short wavelength of graphene plasmons relative to the light wavelength makes them attractive for
applications in optoelectronics and sensing. However, this property limits their coupling to external
light and our ability to create and detect them. More efficient ways of generating plasmons are therefore
desirable. Here we demonstrate through realistic theoretical simulations that graphene plasmons can be
efficiently excited via electron tunneling in a sandwich structure formed by two graphene monolayers
separated by a few atomic layers of hBN. We predict plasmon generation rates of ~ 10^12 - 10^14 1/s over
an area of the squared plasmon wavelength for realistic values of the spacing and bias voltage,
while the yield (plasmons per tunneled electron) has unity order . Our results support electrical
excitation of graphene plasmons in tunneling devices as a viable mechanism for the development of
optics-free ultrathin plasmonic devices.
 S. de Vega and F. J. García de Abajo, ACS. Phot. 4 (2017)
Sandra de Vega and F. Javier García de Abajo, "Plasmon generation through electron tunneling in graphene (Conference Presentation)," Proc. SPIE 10672, Nanophotonics VII, 106721Q (Presented at SPIE Photonics Europe: April 26, 2018; Published: 23 May 2018); https://doi.org/10.1117/12.2309974.5788799616001.
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