TY - JOUR
T1 - Nanoscale Optical Addressing of Valley Pseudospins through Transverse Optical Spin
AU - Gong, Su Hyun
AU - Komen, Irina
AU - Alpeggiani, Filippo
AU - Kuipers, L.
PY - 2020
Y1 - 2020
N2 - Valley pseudospin has emerged as a good quantum number to encode information, analogous to spin in spintronics. Two-dimensional transition metal dichalcogenides (2D TMDCs) recently attracted enormous attention for their easy access to the valley pseudospin through valley-dependent optical transitions. Different ways have been reported to read out the valley pseudospin state. For practical applications, on-chip access to and manipulation of valley pseudospins is paramount, not only to read out but especially to initiate the valley pseudospin state. Here, we experimentally demonstrate the selective on-chip, optical near-field initiation of valley pseudospins at room temperature. We exploit a nanowire optical waveguide, such that the local transverse optical spin of its guided modes selectively excites a specific valley pseudospin. Furthermore, spin-momentum locking of the transverse optical spin enables us to flip valley pseudospins with the opposite propagation direction. Thus, we open up ways to realize integrated hybrid opto-valleytronic devices.
AB - Valley pseudospin has emerged as a good quantum number to encode information, analogous to spin in spintronics. Two-dimensional transition metal dichalcogenides (2D TMDCs) recently attracted enormous attention for their easy access to the valley pseudospin through valley-dependent optical transitions. Different ways have been reported to read out the valley pseudospin state. For practical applications, on-chip access to and manipulation of valley pseudospins is paramount, not only to read out but especially to initiate the valley pseudospin state. Here, we experimentally demonstrate the selective on-chip, optical near-field initiation of valley pseudospins at room temperature. We exploit a nanowire optical waveguide, such that the local transverse optical spin of its guided modes selectively excites a specific valley pseudospin. Furthermore, spin-momentum locking of the transverse optical spin enables us to flip valley pseudospins with the opposite propagation direction. Thus, we open up ways to realize integrated hybrid opto-valleytronic devices.
KW - spin-momentum locking
KW - TMDC materials
KW - transverse optical spin
KW - valleytronics
KW - WS2
KW - ZnO nanowires
UR - http://www.scopus.com/inward/record.url?scp=85086346457&partnerID=8YFLogxK
U2 - 10.1021/acs.nanolett.0c01173
DO - 10.1021/acs.nanolett.0c01173
M3 - Article
C2 - 32406694
AN - SCOPUS:85086346457
VL - 20
SP - 4410
EP - 4415
JO - Nano Letters: a journal dedicated to nanoscience and nanotechnology
JF - Nano Letters: a journal dedicated to nanoscience and nanotechnology
SN - 1530-6984
IS - 6
ER -