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Physics and Astronomy

Physics & Astronomy Colloquium

3:30 PM, Friday, Nov 20, 2015
Room 155, Chem-Phys Building

Dr. Ramesh Budhani
Indian Institute of Technology, Kanpur


Quantum Phases and Phase Transitions in Two-Dimensional Diffusive Metals at Oxide Interfaces

The two-dimensional diffusive metal stabilized at the interface of SrTiO3 and the Mott Insulator perovskite LaTiO3 [1,2] has challenged many notions related to the formation and electronic behavior of the two dimensional electron gas at the well studies LaAlO3-SrTiO3 interface. Here we discuss specifically the stability of the superconducting phase[3] at LaTiO3 – SrTiO3 interface, the nature of the superconductor – normal metal quantum phase transition (T=0 limit) driven by magnetic field, significance of the field vis-a-vis the Chandrasekhar - Clogston limit for depairing, and how the transition is initiated when the extent of Coulomb interaction amongst charge carriers is modulated by electrostatic gating[4]. The nature of the superconducting condensate is highlighted in the light of the Ti - t2g orbital driven bands and their filling in the presence of a strong Rashba spin – orbit interaction (SOI). Towards the end of the talk, we will also discuss the prominent effects of Rashba SOI on normal state quantum transport and how it renormalizes a Kondo-like electronic behavior in range of temperature Tc < T < 5 K[5,6]. 1. Advanced Materials 22, 4448(2010) 2. Phys. Rev. B 86, 075127(2012) 3. Nature Communications, 1, 89(2010) 4. Nature Materials 12, 542(2013) 5. Phys. Rev. B (Rapid Communication) 90, 081107(2014). 6. Phys. Rev. B 90, 075133(2014)

Refreshments will be served in CP 179 at 3:15 PM