Through the looking glass: optical spectroscopy of electronic correlations

by Nimrod Bachar

at Condensed Matter Seminar

Mon, 07 Jan 2019, 11:30
Physics building (#54) room 207

Abstract

Many body systems involving strongly interacting electrons exhibit various rich and interesting physical states such as Mott insulators superconductors heavy Fermions and etc Optical properties serve as an important tool to study these correlations and their resulting collective excitations In my talk I will briefly review several examples of our experimental observations regarding: I Pairing symmetry energy gap superfluid stiffness and phase collective modes in superconducting thin films 1 2 3 II Hybridization of localized and conduction energy bands and their optical plasmons in heavy Fermion systems 4 III The interplay between the coherent and incoherent sectors of the dynamic conductivity of doped Mott insulator systems 5 I will then dwell into the latter example and show the in plane dynamic and static charge conductivity of electron doped Sr2IrO4 using optical spectroscopy and DC transport measurements I will demonstrate the similarity of the optical signature for a pseudo gap in several systems Based on these similarities and the absence of a correlation between superconductivity and pseudo gap in the doped iridate compound I will argue that the pseudo gap is a signature of the presence of residual correlations inherited from the insulating anti ferromagnetic state 1 U S Pracht N B et al Phys Rev B 93 100503 R 2016 2 U S Pracht et al Phys Rev B 96 094514 2017 3 N B et al EPL Europhysics Letters 104 67006 2013 4 N B et al Phys Rev B 94 235101 2016 5 K Wang N B et al Phys Rev B 98 045107 2018

Created on 31-12-2018 by Bar Lev, Yevgeny (ybarlev)
Updaded on 31-12-2018 by Bar Lev, Yevgeny (ybarlev)