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Electron Interference in a Quantum Ring with a Tunable Magnetic Field Shield
Minky Seo,Hwanchul Jung,Yunchul Chung 한국진공학회(ASCT) 2021 Applied Science and Convergence Technology Vol.30 No.2
A quantum ring device that can turn on and off the external magnetic field on the ring is developed. The device is to study the effect of the interaction between electrons and external magnetic fields on Aharonov-Bohm interference. The switching is realized by employing a superconducting shield gate and turning on and off the superconductivity on the gate with applied current or magnetic field. The electron interference due to Aharonov-Bohm effect is observed regardless of the presence of the external magnetic field on the electron path of the ring. The result is consistent with the fact that effects of potentials on charged particles exists even in the region where all the field vanish hence no direct interaction between electron and magnetic field is allowed.