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34 papers · 1 filter
Proposals of nuclear spin quantum memory in group IV elemental and II-VI semiconductors
Özgür Çakır, Toshihide Takagahara
New schemes for the nuclear spin quantum memory are proposed based on a system composed of two electrons or one electron coupled to a single nuclear spin in isotopically purified g…
Control of electric current by graphene edge structure engineering
Masayuki Yamamoto, Katsunori Wakabayashi
In graphene nanoribbon junctions, the nearly perfect transmission occurs in some junctions while the zero conductance dips due to anti-resonance appear in others. We have classifie…
Electronic transport properties of graphene nanoribbons
Katsunori Wakabayashi, Yositake Takane, Masayuki Yamamoto +1
We will present brief overview on the electronic and transport properties of graphene nanoribbons focusing on the effect of edge shapes and impurity scattering. The low-energy elec…
Electrical measurement of a two-electron spin state in a double quantum dot
Nobuhiko Yokoshi, Hiroshi Imamura, Hideo Kosaka
We propose a scheme for electrical measurement of two-electron spin states in a semiconductor double quantum dot. We calculated the adiabatic charge transfer when surface gates are…
Cooling mechanisms in molecular conduction junctions
Michael Galperin, Keiji Saito, Alexander V. Balatsky +1
While heating of a current carrying Ohmic conductors is an obvious consequence of the diffusive nature of the conduction in such systems, current induced cooling has been recently…
Dynamic nuclear polarization induced by breakdown of fractional quantum Hall effect
Minoru Kawamura, Masashi Ono, Yoshiaki Hashimoto +3
We study dynamic nuclear polarization (DNP) induced by breakdown of the fractional quantum Hall (FQH) effect. We find that voltage-current characteristics depend on current sweep r…