![]() Tuning both the blend composition and temperature minimizes the effect of the domain size mismatch. Owing to domain-size mismatches, the alternating gyroid stability window is shifted away from symmetric composition. ![]() IRG-2 researchers have used self-consistent mean-field theory to predict thermal and composition windows of alternating gyroid phase stability in experimentally-relevant blends of poly(isoprene) ( I), poly(styrene) ( S), and poly(ethylene oxide) ( O) diblock and tri-block copolymers: I S, S O, and I S O (see figure). (2023)Īn attractive approach to creating optical materials from self-assembled block copolymers is to create an alternating gyroid network (GA), then etch to remove one of the gyroids networks, followed by backfilling the void with metal to obtain a chiral material with high dielectric contrast. The theoretical analysis attributes the unique superconducting behavior of MoTe 2 as a function of gating to an unconventional pairing state, thus shedding new light on the phenomenon of superconductivity in two-dimensional materials, of broad interest.Ībout the figure: P. Theoretical calculations were performed by IRG-1 student Amartyajyoti Saha. The IRG-1 team’s theoretical approach combined first-principles and model calculations. ![]() This important result opens a new avenue to the control of superconductivity by electrostatic means. The material is bilayer MoTe 2, a member of the family of transition metal dichalcogenides, which are compounds of high interest in IRG-1. (2023)įor the first time, a team comprised of two IRG-1 theorists (Birol and Fernandes) working with experimentalists from other institutions (including the Columbia MRSEC) showed the coexistence of ferroelectricity ( i.e., electrostatically switchable macroscopic dipole moment) and superconductivity in a two-dimensional superconductor. ![]()
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