IPB Colloquium by Wei Ku

You are cordially invited to the IPB COLLOQUIUM which will be held on Monday, 3 July 2023 at 12:00 in the “Zvonko Marić” lecture hall of the Institute of Physics Belgrade. The talk entitled

Chemical disorder-induced electronic orders in correlated metals

will be given by Prof. Dr. Wei Ku (T. D. Lee Institute, Shanghai Jiao Tong University, Shanghai, China). The abstract of the talk:

In strongly correlated metals, long-range magnetic order is sometimes found only upon introduction of a minute amount of disordered non-magnetic impurities to the unordered clean samples. To explain such anti-intuitive behavior, we have proposed a scenario of inducing electronic (magnetic, orbital, or charge) order via chemical disorder in systems with coexisting local moments and itinerant carriers. By disrupting the damaging long-range quantum fluctuation originating from the itinerant carriers, the electronic order preferred by the local moment can be re-established. In this talk we will demonstrate this mechanism using a realistic spin-fermion model and show that the magnetic order can indeed be recovered as a result of enhanced disorder once the length scale of phase coherence of the itinerant carriers becomes shorter than a critical value. The proposed simple idea has a general applicability to strongly correlated metals, and it showcases the rich physics resulting from interplay between mechanisms of multiple length scales.