Particle-hole thermalization in a composite superconducting and normal-conducting nanowire

Area of Science:

• Condensed Matter Physics
• Quantum Mechanics
• Materials Science

Background:

• Thermalization in isolated quantum systems is a key area of research.
• System dynamics and chaos are closely related to thermalization.
• Understanding these mechanisms is crucial for developing new quantum technologies.

Purpose of the Study:

• To investigate thermalization in a solid-state scattering system with superconducting elements.
• To determine if thermalization can occur without degrading quantum entanglement.
• To explore the role of quasibound state resonances in a complex nanowire structure.

Main Methods:

• Utilized a composite NSNSNSNSN nanowire model, featuring bismuth strontium calcium cuprate (Bi₂Sr₂CaCu₂O₈₊ₓ) superconducting (S) and normal conducting (N) segments.
• Focused on parameter regimes where current flow is dominated by tunneling through quasibound state resonances.
• Analyzed the behavior of scattered pure states at specific energy levels.

Main Results:

• Demonstrated that the NSNSNSNSN nanowire system can effectively thermalize scattered states.
• Showed that the degree of entanglement in the scattered states remains unaffected by the thermalization process.
• Observed that scattered pure states approach ergodicity at certain energies while maintaining their purity.

Conclusions:

• Solid-state systems incorporating superconducting elements can achieve thermalization.
• Quantum entanglement can be preserved during the thermalization of scattered states in such systems.
• Quasibound state resonances play a significant role in the thermalization dynamics of complex nanowire structures.