Response Current from Spin-Vortex-Induced Loop Current System to Feeding Current

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Tsubasa Morisaki¹, Hikaru Wakaura², Michel Abou Ghantous³, and Hiroyasu Koizumi¹^,²^,

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¹Division of Materials Science, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan²Center for Computational Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan³American University of Technology, AUT Halat, Highway, Lebanon

Received February 2, 2017; Accepted May 8, 2017; Published June 7, 2017

The spin-vortex-induced loop current (SVILC) is a loop current generated around a spin-vortex formed by itinerant electrons. It is generated by a U(1) instanton created by the single-valued requirement of wave functions with respect to the coordinate, and protected by the topological number, “winding number”. In a system with SVILCs, a macroscopic persistent current is generated as a collection of SVILCs. In the present work, we consider the situation where external currents are fed in the SVILC system and response currents are measured as spontaneous currents that flow through leads attached to the SVILC system. The response currents from SVILC systems are markedly different from the feeding currents in their directions and magnitude, and depend on the original current pattern of the SVILC system; thus, they may be used in the readout process in the recently proposed SVILC quantum computer, a quantum computer that utilizes SVILCs as qubits. We also consider the use of the response current to detect SVILCs.

https://doi.org/10.7566/JPSJ.86.074702

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Response Current from Spin-Vortex-Induced Loop Current System to Feeding Current

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