講師:Dr. Roland Willa (Karlsruhe Institute of Technology)
場所:東京大学 柏キャンパス 基盤棟物質系講義室(2B6号室)

タイトル:Strain-tuning of electronic nematicity in low-dimensional systems

Electronic fluctuations in low-dimensional systems can split a single phase transition of two degenerate primary (charge, magnetic) orders into a sequence of two transitions: The degeneracy is lifted at the first, so-called preemptive, transition, while the appearance of the primary order awaits the second one. In many cases the preemptive phase breaks discrete lattice symmetries and hence is very sensitive to strain tuning. I will discuss a generic approach to capture this preemptive phase and its response to strain and focus more specifically on the Ising nematic order in pnictide compounds. Understanding this exciting phenomenon may provide key insights to the low-temperature physics of correlated electronic systems.