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

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.

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)