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Quasi-Ferromagnet Spintronics in Graphene Nanodisk-Lead System
Motohiko Ezawa
A zigzag graphene nanodisk can be interpreted as a quantum dot with an internal degree of freedom. It is well described by the infinite-range Heisenberg model. We have investigated…
Quasi-Phase Transition and Many-Spin Kondo Effects in Graphene Nanodisk
Motohiko Ezawa
The trigonal zigzag nanodisk with size has localized spins. We investigate its thermodynamical properties with and without external leads. Leads are made of zigzag graphene…
Spin Filter, Spin Amplifier and Other Spintronic Applications in Graphene Nanodisks
Motohiko Ezawa
Graphene nanodisk is a graphene derivative with a closed edge. The trigonal zigzag nanodisk with size has -fold degenerated zero-energy states. A nanodisk can be interplette…
Graphene Nanoribbon and Graphene Nanodisk
Motohiko Ezawa
We study electronic properties of graphene derivatives which have closed edges. They are finite-length graphene nanoribbons and graphene nanodisks. No metallic states are found in…
Intrinsic Zeeman Effect in Graphene
Motohiko Ezawa
The intrinsic Zeeman energy is precisely one half of the cyclotron energy for electrons in graphene. As a result a Landau-level mixing occurs to create the energy spectrum comprise…
Metallic Graphene Nanodisks
Motohiko Ezawa
We explore the electronic properties of finite-length graphene nanoribbons as well as graphene nanodisks with various sizes and shapes in quest of metallic ones. For this purpose i…