Magnetic Arctic Circle in a Square Ice Qubit Lattice

Area of Science:

• Statistical Mechanics
• Quantum Computing
• Condensed Matter Physics

Background:

• The

Purpose of the Study:

• To experimentally realize and investigate the physics of the arctic circle phenomenon for the first time.
• To explore the properties of a highly frustrated magnet using a programmable superconducting qubit lattice.

Main Methods:

• Utilizing a programmable lattice of superconducting qubits to model the square ice system.
• Investigating the phase separation and emergent properties within the arctic circle boundary.

Main Results:

• The disordered spin manifold within the arctic curve was identified as a spin liquid with an antivortex-like spin texture, characteristic of a topologically charged Coulomb phase.
• Monopole quasiparticle excitations, previously unobserved theoretically, were isolated in the phase-separated system.
• A spontaneous monopole segregation mechanism was discovered, sorting monopoles by magnetic charge and moment.

Conclusions:

• The experimental realization of the arctic circle provides a novel platform for studying complex magnetic phenomena.
• The discovery of spin liquids and isolated monopoles in this system opens new avenues for research in topological phases and frustrated magnetism.
• The observed monopole segregation mechanism suggests potential for novel control and manipulation of quasiparticles.