TY - JOUR
T1 - Theoretical Study of Unconventional Plasmons Formation within a Reduced-Size 1D Hubbard Model around a Quarter Filling
AU - Tambunan, A. R.P.
AU - Wilwin, W.
AU - Majidi, M. A.
N1 - Funding Information:
The authors thank Universitas Indonesia for supporting this project through PITTA Research Grant No. 2285/UN2.R3.1/HKP.05.00/2018.
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2019/1/1
Y1 - 2019/1/1
N2 -
Plasmons, which are conventionally known as quanta of electron plasma oscillations in a metal, were discovered unconventionally in an experiment of Strontium Niobate Oxide with oxygen enrichment (SrNbO
3,4
). Plasmons that revealed in this experiment arose in the visible-ultraviolet range due to a confinement created by additional oxygens forming nanometer-spaced planes. This experimental background motivated us to study the formation of unconventional plasmons in the material by modeling a hypothetical system described by 5-sites linear chain Hubbard model around a quarter filling. The model was then solved by exact diagonalization (ED) method, from which we constructed the corresponding retarded Green function via Lehmann representation. Our interest was to calculate the optical response functions using Kubo formula of the linear response theory. Our results showed that the conventional plasmonic signals got modified by the presence of on-site Coulomb interactions. In addition, we observed that unconventional plasmons, behaving similarly to those found in the experiment, arose when the Coulomb intersite interaction was applied to the calculation.
AB -
Plasmons, which are conventionally known as quanta of electron plasma oscillations in a metal, were discovered unconventionally in an experiment of Strontium Niobate Oxide with oxygen enrichment (SrNbO
3,4
). Plasmons that revealed in this experiment arose in the visible-ultraviolet range due to a confinement created by additional oxygens forming nanometer-spaced planes. This experimental background motivated us to study the formation of unconventional plasmons in the material by modeling a hypothetical system described by 5-sites linear chain Hubbard model around a quarter filling. The model was then solved by exact diagonalization (ED) method, from which we constructed the corresponding retarded Green function via Lehmann representation. Our interest was to calculate the optical response functions using Kubo formula of the linear response theory. Our results showed that the conventional plasmonic signals got modified by the presence of on-site Coulomb interactions. In addition, we observed that unconventional plasmons, behaving similarly to those found in the experiment, arose when the Coulomb intersite interaction was applied to the calculation.
UR - http://www.scopus.com/inward/record.url?scp=85065653304&partnerID=8YFLogxK
U2 - 10.1088/1757-899X/515/1/012055
DO - 10.1088/1757-899X/515/1/012055
M3 - Conference article
AN - SCOPUS:85065653304
SN - 1757-8981
VL - 515
JO - IOP Conference Series: Materials Science and Engineering
JF - IOP Conference Series: Materials Science and Engineering
IS - 1
M1 - 012055
T2 - International Conference on Condensed Matters and Advanced Materials 2018, IC2MAM 2018
Y2 - 5 September 2018
ER -