The chiral topological superconductor (TSC) is a unique state of matter that supports 1D chiral Majorana edge modes while maintaining a full pairing gap in the bulk. Recent research has proposed a method for realizing this exotic phase by using hybridized quantum-anomalous-Hall (QAH) insulator heterostructures. By inducing superconductivity in the QAH chiral edge modes through proximity coupling with an s-wave superconductor, it is possible to create a chiral TSC.
In this study, researchers investigated the electric conductance and current spatial distribution in a specific case of a QAH thin slab containing a central proximity-hybridized sector in the chiral TSC phase. The system analyzed was a normal-hybrid-normal double junction, with the central sector acting as a chiral TSC. The researchers found three distinct regimes depending on the applied bias: quantized conductance with edge current at low bias, bias-dependent edge current oscillations at intermediate bias, and quasiparticle diffusive transport through delocalized states at higher bias exceeding the surface gap.
By understanding the patterns and interference of electric currents in these chiral topological superconductors, researchers gain deeper insights into the physics of these fascinating materials. Resolving the spatial distribution of local currents in thin slabs could provide additional evidence of the presence of chiral topological superconductors, complementing global conductance measurements.
Frequently Asked Questions (FAQ)
What is a chiral topological superconductor?
A chiral topological superconductor is a type of superconducting state that supports 1D chiral Majorana edge modes while maintaining a full pairing gap in the bulk. These edge modes have unique properties that make them of great interest to researchers studying topological materials.
How are chiral topological superconductors realized?
Chiral topological superconductors can be realized by hybridizing quantum-anomalous-Hall (QAH) insulator heterostructures with an s-wave superconductor. By inducing superconductivity in the QAH chiral edge modes through proximity coupling, it is possible to create the conditions necessary for a chiral topological superconductor to emerge.
What are the different regimes observed in this study?
In this study, three different regimes were observed depending on the applied bias across the junction. At low bias, there was quantized conductance with edge current. At intermediate bias, there were bias-dependent edge current oscillations. At higher bias exceeding the surface gap, there was quasiparticle diffusive transport through delocalized states.
Why is understanding the patterns and interference of electric currents important?
Understanding the patterns and interference of electric currents in chiral topological superconductors provides valuable insights into their underlying physics. By studying the spatial distribution of currents in thin slabs, researchers can gather additional evidence of the presence of chiral topological superconductors, enhancing our understanding of these intriguing materials.