Theory of Quantum Transport based on Spin and Orbital.

一个electron has the internal degrees of freedom， spin charge orbital，The flow of charge of electrons is current, The flow of charge of electrons is currentand electronics based on the control of current. the electronics based on spin current is calledspin-electronics. The dynamics of orbital is also expected in transition metal oxides.In thisfeed,the theory of quantum transport starting with the dynamics of these internal degrees of freedom ofelectron has been constructed.1.它应该是当前和当前角色之间的协议目前可以在一个non-local spin Hall device together with一个experimental group.自the conversion is one of the Onsager reciprocal relationsit is a very basic concept in physics.2. in a device consisting ofu s p e r c o n d u c t o r / f erromagnet / superconductor tunnel junctions,Josephson目前的flowing between two superductors has the extra phase，π。This is called the π-junction.我们已经承诺与π-junction may一个superconducting ring with π-junction maybe used as a quantum计算设备（qubit） without applied magnetic field.3.In several transitionmetal oxides such as na_xcool_2，我们应该在orbital degeneracy causes an electroniclattice with is different from the crystal one. As a result，a variety of novel physical properties are expected. Based on the theory，我们已经在anomalous Hall effect and giant thermopower observed in na_xcool_2 . in thisfeed,我们投资各种quantum transport phenomena starting with the internal degrees offreedom of an electron。

An electron has the internal degrees of freedom, spin・charge・orbital, which give rise to materials properties. The flow of charge of electrons is current, and electronics is based on the control of current. The electronics based on spin current is called spin-electronics. The dynamics of orbital is also expected in transition metal oxides.In this project, the theory of quantum transport starting with the dynamics of these internal degrees of freedom of an electron has been constructed.1.It is shown that the conversion between spin current and charge current can be obtained in a non-local spin Hall device together with an experimental group. Since the conversion is one of the Onsager reciprocal relations, it is a very basic concept in physics.2.In a device consisting of superconductor/ferromagnet/superconductor tunnel junctions, the Josephson current flowing between two superconductors has the extra phase, π. This is called the π-junction. We have proposed that a superconducting ring with π-junction may be used as a quantum computing device (qubit) without applied magnetic field.3.In several transition metal oxides such as Na_xCoO_2,we have shown that the orbital degeneracy causes an electronic lattice with is different from the crystal one. As a result, a variety of novel physical properties are expected. Based on the theory, we have formulated the anomalous Hall effect and giant thermopower observed in Na_xCoO_2.In this project, we have investigated various quantum transport phenomena starting with the internal degrees of freedom of an electron.