Electron-phonon coupling in copper intercalated Bi[Formula: see text]Se[Formula: see text].

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Phenomena

Background:

• Topological insulators (TIs) like Bi2Se3 exhibit unique electronic properties.
• Hybrid devices incorporating TIs offer platforms for novel quantum effects.
• Understanding charge and heat transport is crucial for TI applications.

Purpose of the Study:

• Investigate charge and heat transport in copper-intercalated Bi2Se3 hybrid devices.
• Analyze the influence of quantum corrections and electron interactions on conductivity.
• Characterize the temperature dependence of heat flux and its underlying mechanisms.

Main Methods:

• Fabrication of copper-intercalated Bi2Se3 hybrid devices.
• Electrical conductivity measurements to probe quantum corrections and interactions.
• Shot noise measurements to analyze heat flux behavior.
• Temperature-dependent transport studies.

Main Results:

• Conductivity measurements reveal signatures of quantum corrections, electron-electron, and electron-phonon interactions.
• Shot noise data indicates a crossover in heat flux behavior with increasing temperature.
• The observed heat flux crossover is linked to inelastic electron scattering and acoustic phonons.

Conclusions:

• Copper intercalation modifies the transport properties of Bi2Se3.
• Electron scattering and phonon interactions play a significant role in heat transport.
• The findings provide insights into electron-phonon coupling in topological insulator hybrid systems.