Dresden 2020 – wissenschaftliches Programm
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MA 13.3: Vortrag
Montag, 16. März 2020, 15:30–15:45, HSZ 304
Tuning the two-step melting of magnetic order in dipolar kagome ice by quantum fluctuations — Yao Wang1,2, •Stephan Humeniuk1, and Yuan Wan1,2 — 1Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China — 2University of Chinese Academy of Sciences, Beijing 100049, China
Complex magnetic orders in frustrated magnets may exhibit rich melting processes when the magnet is heated toward the paramagnetic phase. We show that one may tune such melting processes by quantum fluctuations. We consider a kagome lattice dipolar Ising model subject to transverse field and focus on the thermal transitions out of its magnetic ground state, which features a √3×√3 magnetic unit cell. Our quantum Monte Carlo simulations suggest that, at weak transverse field, the √3×√3 magnetic order melts by way of an intervening, magnetically charge ordered phase where the lattice translation symmetry is restored whilst the time reversal symmetry remains broken. By contrast, at strong transverse field, quantum Monte Carlo simulations suggest the √3×√3 order melts through a floating Kosterlitz-Thouless phase. The two distinct melting processes are likely separated by a multicritical point.