TY - JOUR
T1 - Topological aspects of excitons in artificial structure
AU - Kumagai, Masami
AU - Taguchi, Akihito
AU - Takagahara, Toshihide
AU - Ohno, Takahisa
AU - Yakubo, Kousuke
N1 - Funding Information:
One of the authors (MK) thanks N. Hatakenaka, S. Tanda, and Y. Tokura for fruitful discussions. This work was supported in part by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (Grant No. 16360044).
PY - 2008/1
Y1 - 2008/1
N2 - The exciton properties of thin nanotube structures are investigated theoretically. Anisotropic size dependencies have been found in the exciton binding energy, the kinetic energy for the relative motions of an electron and a hole, and the wavefunction. These anisotropies arise from the different boundary conditions in the tube-length and circumferential directions, namely, the topological features of nanotubes. We also found that it is possible to change the topology of exciton wavefunctions by varying the tube-length and the tube-radius. These findings suggest that the optical properties of nanotubes such as oscillator strength or nonlinear susceptibilities can be controlled by tuning the structural parameters, thus yielding a novel guiding principle for designing optical functional materials.
AB - The exciton properties of thin nanotube structures are investigated theoretically. Anisotropic size dependencies have been found in the exciton binding energy, the kinetic energy for the relative motions of an electron and a hole, and the wavefunction. These anisotropies arise from the different boundary conditions in the tube-length and circumferential directions, namely, the topological features of nanotubes. We also found that it is possible to change the topology of exciton wavefunctions by varying the tube-length and the tube-radius. These findings suggest that the optical properties of nanotubes such as oscillator strength or nonlinear susceptibilities can be controlled by tuning the structural parameters, thus yielding a novel guiding principle for designing optical functional materials.
KW - A. Exciton
KW - A. Nanotube
KW - D. Topology
KW - D. Wavefunction
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U2 - 10.1016/j.ssc.2007.10.011
DO - 10.1016/j.ssc.2007.10.011
M3 - Article
AN - SCOPUS:36348953777
VL - 145
SP - 154
EP - 158
JO - Solid State Communications
JF - Solid State Communications
SN - 0038-1098
IS - 3
ER -