2020/12/21 by Fatemeh Barati, Barati, Fatemeh, Trevor Arp +15
Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Mechanical and Optical Resonators #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Nanowire Synthesis and Applications
paper · pdf · doi:10.48550/arxiv.2012.11688
openalex publication_date 2020/12/21 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
We reveal stacking-induced strong coupling between atomic motion and\ninterlayer excitons through photocurrent measurements of WSe2/MoSe2\nheterojunction photodiodes. Strong coupling manifests as pronounced periodic\nsidebands in the photocurrent spectrum in frequency windows close to the\ninterlayer exciton resonances. The sidebands, which repeat over large swathes\nof the interlayer exciton photocurrent spectrum, occur in energy increments\ncorresponding directly to a prominent vibrational mode of the heterojunction.\nSuch periodic patterns, together with interlayer photoconductance oscillations,\nvividly demonstrate the emergence of extraordinarily strong exciton-phonon\ncoupling - and its impact on interlayer excitations - in stack-engineered van\nder Waals heterostructure devices. Our results establish photocurrent\nspectroscopy as a powerful tool for interrogating vibrational coupling to\ninterlayer excitons and suggest an emerging strategy to control vibronic\nphysics in the solid-state.\n