Quantum Materials - 08

Abstract

In conventional semiconductors, electronic band structures typically remain unchanged with doping via chemical-potential shift or temperature increase. However, in strongly correlated insulators such as Mott and Kondo insulators, electronic band structures undergo dramatic modifications: electronic modes with momentum-shifted magnetic dispersion relations can emerge from the band edges, reflecting low-energy magnetic excitations [Figs. 1 and 2] [1--10]. In this poster, the underlying mechanism and dispersion relations of these emergent electronic modes are elucidated based on selection rules and effective theory for coupled-dimer systems, supported by quantitative numerical calculations [1--10]. The results demonstrate how the generation of electronic states, which is unique to strongly correlated materials, can be harnessed as a new working principle for electronic devices beyond conventional semiconductor electronics. This paves the way for strong-correlation electronics, in which band structures are controllable by external perturbations---a feature that stems from spin-charge separation in strongly correlated insulators.