Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Controlling surface charge and spin density oscillations by Dirac plasmon interaction in thin topological insulators. / Poyli, M. Ameen; Hrtoň, M.; Nechaev, I. A.; Nikitin, A. Y.; Echenique, P. M.; Silkin, V. M.; Aizpurua, J.; Esteban, R.
в: Physical Review B, Том 97, № 11, 115420, 15.03.2018.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Controlling surface charge and spin density oscillations by Dirac plasmon interaction in thin topological insulators
AU - Poyli, M. Ameen
AU - Hrtoň, M.
AU - Nechaev, I. A.
AU - Nikitin, A. Y.
AU - Echenique, P. M.
AU - Silkin, V. M.
AU - Aizpurua, J.
AU - Esteban, R.
PY - 2018/3/15
Y1 - 2018/3/15
N2 - Thin topological insulator (TI) films support optical and acoustic plasmonic modes characterized by effective net charge or net spin density, respectively. We combine many-body and electromagnetic calculations to study how these modes can be selectively excited at films and nanodisks at infrared and THz frequencies. We first discuss the excitation of propagating plasmons in a thin film by a point dipolar source. We emphasize how changing the distance between the dipolar source and the film allows us to control the relative strength of the acoustic and optical plasmons and thus to excite net-spin or net-charge waves on demand. The acoustic and optical modes in a nanodisk structure can be efficiently tuned by changing the size of the disk or by applying electrostatic gating. Furthermore, these modes can be confined to regions of dimensions much smaller than the wavelength. The control of the excitation of acoustic and optical modes indicates that thin topological insulators are a promising system to manipulate the spin and charge properties of the plasmonic response, with potential applications in fast, compact, and electrically-controlled spintronic devices.
AB - Thin topological insulator (TI) films support optical and acoustic plasmonic modes characterized by effective net charge or net spin density, respectively. We combine many-body and electromagnetic calculations to study how these modes can be selectively excited at films and nanodisks at infrared and THz frequencies. We first discuss the excitation of propagating plasmons in a thin film by a point dipolar source. We emphasize how changing the distance between the dipolar source and the film allows us to control the relative strength of the acoustic and optical plasmons and thus to excite net-spin or net-charge waves on demand. The acoustic and optical modes in a nanodisk structure can be efficiently tuned by changing the size of the disk or by applying electrostatic gating. Furthermore, these modes can be confined to regions of dimensions much smaller than the wavelength. The control of the excitation of acoustic and optical modes indicates that thin topological insulators are a promising system to manipulate the spin and charge properties of the plasmonic response, with potential applications in fast, compact, and electrically-controlled spintronic devices.
KW - GRAPHENE PLASMONS
KW - OPTICAL-PROPERTIES
KW - BI2TE3
KW - BI2SE3
KW - NANOSTRUCTURES
KW - RESONATORS
KW - POLARITONS
KW - FERMIONS
KW - ANTENNAS
KW - ARRAYS
UR - http://www.scopus.com/inward/record.url?scp=85043986133&partnerID=8YFLogxK
UR - http://www.mendeley.com/research/controlling-surface-charge-spin-density-oscillations-dirac-plasmon-interaction-thin-topological-insu
U2 - 10.1103/PhysRevB.97.115420
DO - 10.1103/PhysRevB.97.115420
M3 - Article
AN - SCOPUS:85043986133
VL - 97
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 11
M1 - 115420
ER -
ID: 36282623