Modeling of dislocations in a CDW junction: Interference of the CDW and normal carriers

作者：Bravo, Alvaro Rojo; Yi, Tianyou; Kirova, Natasha^*; Brazovskii, Serguei

来源：Physica B: Condensed Matter , 2015, 460: 16-20.

DOI：10.1016/j.physb.2014.11.031

• CDW
• Vortex
• Dislocation
• Junction
• PDE
• Comsol

We derive and study equations for dissipative transient processes in a constraint incommensurate charge density wave (CDW) with remnant pockets or a thermal population of normal can The attention was paid to give the correct conservation of condensed and normal electrons, which was problematic at presence of moving dislocation cores if working within an intuitive Ginzburg-Landau like model. We performed a numeric modeling for stationary and transient states in a rectangular geometry when the voltage V or the normal current are applied across the conducting chains. We observe creation of an array of electronic vortices, the dislocations, at or close to the junction surface; their number increases step-wise with increasing V. The dislocation core strongly concentrates the normal carriers but the CDW phase distortions almost neutralize the total charge. At other regimes, the lines of the zero CDW amplitude flash across the sample working as phase slips. The studies were inspired by, and can be applied to experiments on mesa-junctions in NbSe3 and TaS3.

• 出版日期2015-3-1
• 单位南方科技大学