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Authors = Yasuhiro Tokura

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22 pages, 1202 KiB  
Article
Quantum Adiabatic Pumping in Rashba- Dresselhaus-Aharonov-Bohm Interferometer
by Yasuhiro Tokura
Entropy 2019, 21(9), 828; https://doi.org/10.3390/e21090828 - 24 Aug 2019
Cited by 1 | Viewed by 3343
Abstract
We investigate the quantum adiabatic pumping effect in an interferometer attached to two one-dimensional leads. The interferometer is subjected to an Aharonov-Bohm flux and Rashba-Dresselhaus spin-orbit interaction. Using Brouwer’s formula and rigorous scattering eigenstates, we obtained the general closed formula for the pumping [...] Read more.
We investigate the quantum adiabatic pumping effect in an interferometer attached to two one-dimensional leads. The interferometer is subjected to an Aharonov-Bohm flux and Rashba-Dresselhaus spin-orbit interaction. Using Brouwer’s formula and rigorous scattering eigenstates, we obtained the general closed formula for the pumping Berry curvatures depending on spin for general interferometers when the external control parameters only modulate the scattering eigenstates and corresponding eigenvalues. In this situation, pumping effect is absent in the combination of the control parameters of Aharonov-Bohm flux and spin-orbit interaction strength. We have shown that finite pumping is possible by modulating both Rashba and Dresselhaus interaction strengths and explicitly demonstrated the spin-pumping effect in a diamond-shaped interferometer made of four sites. Full article
(This article belongs to the Special Issue Quantum Transport in Mesoscopic Systems)
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21 pages, 737 KiB  
Article
The Origin of Raman D Band: Bonding and Antibonding Orbitals in Graphene
by Ken-ichi Sasaki, Yasuhiro Tokura and Tetsuomi Sogawa
Crystals 2013, 3(1), 120-140; https://doi.org/10.3390/cryst3010120 - 22 Feb 2013
Cited by 57 | Viewed by 13262
Abstract
In Raman spectroscopy of graphite and graphene, the D band at ∼ 1355 cm−1 is used as the indication of the dirtiness of a sample. However, our analysis suggests that the physics behind the D band is closely related to a very [...] Read more.
In Raman spectroscopy of graphite and graphene, the D band at ∼ 1355 cm−1 is used as the indication of the dirtiness of a sample. However, our analysis suggests that the physics behind the D band is closely related to a very clear idea for describing a molecule, namely bonding and antibonding orbitals in graphene. In this paper, we review our recent work on the mechanism for activating the D band at a graphene edge. Full article
(This article belongs to the Special Issue Graphenes)
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