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|Title:||PHYSICS, CONTROL AND APPLICATIONS OF ELECTRONIC PHASE TRANSITIONS IN HIGH-TC CUPRATES AND VO2 THIN FILMS||Authors:||ZHANG LINGCHAO||Keywords:||high-Tc cuprates, electrolyte gating, superconductor-insulator transition, VO2, metal-insulator transition, thin film||Issue Date:||5-Aug-2016||Citation:||ZHANG LINGCHAO (2016-08-05). PHYSICS, CONTROL AND APPLICATIONS OF ELECTRONIC PHASE TRANSITIONS IN HIGH-TC CUPRATES AND VO2 THIN FILMS. ScholarBank@NUS Repository.||Abstract:||Electron correlations in transition metal oxides lead to many interesting phenomena, such as superconductor-insulator transition (SIT) in high-Tc cuprates and metal-insulator transition (MIT) in VO2 thin films. The control of electronic phase transitions is important both for physics and applications. We studied thickness effect of NBCO films and realized continuous control of its SIT. A quantum critical point was found at pair quantum resistance. We then investigated the mechanism of electrolyte gating on high-Tc cuprates. It is field-induced oxygen migration for NBCO while it is electrostatic field effect for PCCO. This difference is probably due to that NBCO has mobile oxygen in CuO chains while PCCO does not. In another project, two ultrathin switchable terahertz quarter wave plates were created by integrating VO2(M) films into metasurfaces. By control of the MIT, effective lengths of resonators could be tuned, leading to the switch of operating frequency.||URI:||http://scholarbank.nus.edu.sg/handle/10635/134461|
|Appears in Collections:||Ph.D Theses (Open)|
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