第10回物理工学科教室談話会[Prof. Karlo Penc・3/1(金)10時～]

講　師：Prof. Karlo Penc
所　属：Institute for Solid State Physics and Optics, HUN-REN Wigner Research Centre for Physics
題　目：Crystalline phases and devil's staircase in qubit spin ice
日　時：2024 年 3 月 1 日（金）10:00～11:30
Date and Time：March 1, 2024 (Friday) 10:00-11:30
場　所：工 6 号館 1 階大会議室
Place ：Large Conference Room, 1st floor, Engineering Bldg. 6

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.

Reference:
M. Kondákor and K. Penc, Phys. Rev. Research 5, 043172/1-28 (2023).

紹介教員：求 幸年 教授（物理工学専攻）、渡辺 悠樹 准教授（物理工学専攻）