Step bunching with both directions of the current: Vicinal W(110) surfaces versus atomistic-scale model

作者：Toktarbaiuly Olzat; Usov Victor; Coileain Cormac O; Siewierska Katarzyna; Krasnikov Sergey; Norton Emma; Bozhko Sergey I; Semenov Valery N; Chaika Alexander N; Murphy Barry E; Lubben Olaf; Krzyzewski Filip; Zaluska Kotur Magdalena A; Krasteva Anna; Popova Hristina; Tonchev Vesselin^*; Shvets Igor V

来源：Physical Review B, 2018, 97(3): 035436.

DOI：10.1103/PhysRevB.97.035436

We report the observation of bunching of monoatomic steps on vicinal W(110) surfaces induced by step-up or step-down currents across the steps. Measurements reveal that the size-scaling exponent., connecting the maximal slope of a bunch with its height, differs depending on the current direction. We provide a numerical perspective by using an atomistic-scale model with a conserved surface flux to mimic experimental conditions, and also show that there is an interval of parameters in which the vicinal surface is unstable against step bunching for both directions of the adatom drift.

• 出版日期2018-1-25