Dislocation Majorana zero modes in perovskite oxide 2DEG.

Area of Science:

• Condensed Matter Physics
• Quantum Materials
• Superconductivity

Background:

• Current Majorana zero mode detection focuses on quantum wires with strong spin-orbit coupling.
• Majorana zero modes are exotic quasiparticles with potential applications in quantum computing.
• Experimental detection often faces complications from other low-lying states.

Purpose of the Study:

• To explore the realization of Majorana zero modes at crystalline dislocations in 2D superconductors.
• To investigate a new platform for Majorana zero mode detection that avoids experimental complexities.

Main Methods:

• Theoretical proposal utilizing anisotropic orbital dispersion (t2g orbitals) of Ti or Ta atoms.
• Focus on surface two-dimensional electronic gas (2DEG) of SrTiO3 or KTaO3.
• Consideration of intrinsic pairing and proximity-induced superconductivity.

Main Results:

• Demonstration that crystalline dislocations in specific 2D superconductors can host Majorana zero modes.
• Identification of weak topological superconductivity arising from anisotropic orbital dispersion.
• Highlighting the absence of other midgap states at dislocations, simplifying detection.

Conclusions:

• Crystalline dislocations in SrTiO3 or KTaO3 offer a promising, less complex platform for detecting Majorana zero modes.
• This approach provides an alternative to traditional quantum wire systems for realizing these exotic particles.