Interfaces and physical properties of novel quantum matters
子磊晶成長系統（Laser MBE System），製備各種不同軸向的多鐵錳
This proposal is mainly an extension of the efforts that our group had put forth in investigating perovskite oxides thin films over the past decade. We will further our efforts to investigate the physical properties of the interfaces formed between the novel quantum matters by using the film preparation and characterization facilities established. We will combine the PLD system with the laser MBE system to prepare multiferroic films with distinct crystallographic orientations as well as nanostructures of the same materials. The general physical properties such as crystal structure, surface morphology, and multiferroics characteristic will be checked by XRD、AFM and transport measurement systems. Subsequently, we will deposit other quantum matters, such as high-Tc superconducting thin films and newly discovered topological insulators, onto substrates grown with the abovementioned multiferroic films or nanostructures. It is anticipated that by modulating the antiferromagnetic phase and the associated ferroelectricity, the superconducting properties will be modulated. In particular, it will be interesting to observe whether the multiferroicity will be changed by the proximity of superconductivities. We will also put some efforts on studying the (Bi1-xSbx)2(Te1-ySey)3 topological insulator systems by using NMR techniques. In particular, we will study the spectrum change as well as the Knight shift as a function of doping concentration variation to delineate the effects of impurity on the surface conducting states. These results will be compared with the corresponding band structure results from the ARPES measurements performed by our collaborators to shed some lights on these novel quantum matters.
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