Date/Time
Date(s) - Sep 16 2015
10:00 AM - 11:00 AM
Location
Sycamore Room, Building 40, room 195
Category(ies)
Engineering of the Fermiology and many-body interactions by MBE
Carolina Adamo
Department of Applied Physics, Geballe Laboratory for Advanced Materials, Stanford University, California
Functional oxides that exhibit exciting and potentially useful properties including superconductivity, ferroelectricity, piezoelectricity, and magnetism are being intensively studied. These properties, together with the possibility of tuning them through strain, chemical doping or the application of external fields, make such functional oxides suitable for use in microelectromechanical systems (MEMS), transistors, and field effect devices. Moreover interfaces and superlattices of correlated oxides present new opportunities for controlling and optimizing the magnetic and electric properties.
Significant progress in the growth of atomic-scale multilayers opens exciting opportunities in the design of materials with novel properties.
In this talk I will present how to engineering thin films and superlattices with abrupt and coherent interfaces by a reactive molecular-beam epitaxy (MBE). In particular, I synthesize and investigate the electronic structure of oxide superlattices of the Mott insulator LaMnO3and the band insulator SrMnO3. By controlling the separation between the LaMnO3-SrMnO3interfaces, we have observed that the quasiparticle interactions are enhanced, driving the electronic states from a ferromagnetic polaronic metal to a pseudogapped insulating ground state.
Moreover, I will also demonstrate the deliberate engineering of the Fermiology and quantum many-body interactions via epitaxial strain control in the spin-triplet superconductor Sr2RuO4 and its sister compound Ba2RuO4 using a combination of MBE and in situ angle-resolved photo emission spectroscopy (ARPES). Future work will also be presented.
