Crystalline phases and devil's staircase in qubit spin ice

Speaker: 
Prof. Karlo Penc
Institution: 
Wigner Research Centre for Physics, Hungary
Date: 
Tuesday, July 30, 2024
Time: 
11:00 am
Location: 
FRH 2139

Abstract: Motivated by the recent realization of an artificial quantum spin ice in an array of superconducting qubits with tunable parameters, we scrutinize a quantum six-vertex model on the square lattice that distinguishes type-I and type-II vertices. We map the zero-temperature phase diagram using numerical and analytical methods. Following a symmetry classification, we identify three crystalline phases alongside a subextensive manifold of isolated configurations. Monte Carlo simulations at the multicritical Rokhsar-Kivelson point provide evidence for a quantum phase exhibiting a cascade of transitions with increasing flux. By comparing structure factors, we find evidence for the emergence of the fully flippable and plaquette phases in the artificial quantum spin ice.
 

The talk is based on Phys. Rev. Research 5, 043172/1-28 (2023). 
https://urldefense.com/v3/__http://link.aps.org/doi/10.1103/PhysRevResearch.5.043172__;!!CzAuKJ42GuquVTTmVmPViYEvSg!NJvQ3KUbB8KDQrff9mX0H0izhHhzniuNZFhy1-qnQVCJxyFQprchuMR8pMQ5aryFbX1yUGPHtSkcGyfHVuWrbT1y_Xbfiw$ 
 

Host: 
Judit Romhanyi