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Recent numerical research on a mesoscopic Josepshon device by Dr. S. Kawabata (Machida team) has been published online on March 19, 2010.
Researcher:
Shiro Kawabata (Senior Researcher, Nanomaterials Theory Group, Nanotechnology Research Institute, AIST)
Publication Date:March 19, 2010
Journal Title:Physical Review Letters
Contents:
As a part of Basic Research Programs of JST (Japan Science and Technology Agency), Dr. Shiro Kawabata has developed a numerical simulation method for the quantum transport in superconductor Josepshon devices. Based on this method, he has predicted a novel phase transition phenomena in such systems.
The developing field of superconducting spintronics comprises a plenty of fascinating phenomena that may complement non-superconducting spintronics devices. Mesoscopic hybrid structures consisting of superconducting and magnetic materials have attracted considerable attention as devices with novel functionalities. One of most interesting effects is the formation of pi-states in superconductor/ferromagnetic-metal/superconductor Josephson junctions.
Dr. Kawabata and coworkers have predicted anomalous atomic-scale 0-pi transitions in a Josephson junction with a ferromagnetic insulator (FI) barrier. The ground state of such junction alternates between 0- and pi-states when thickness of FI is increasing by a single atomic layer.
Based on these results, they have shown that stable pi-state can be realized in junctions based on high-Tc superconductors with LaBaCuO barrier.
Their findings suggest the way of realizing ideal quantum bit which is robust to the decoherence.
The present study will appear in Physical Review Letters 104 (2010) 117002, published online on March 19, 2010
Link of Physical Review Letters：
http://prl.aps.org/abstract/PRL/v104/i11/e117002/
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