Anomalous diffusion analysis of the lifting events in the event-chain Monte Carlo for the classical XY models

We introduce a novel random walk model that emerges in the event-chain Monte Carlo (ECMC) of spin systems. In the ECMC, the lifting variable specifying the spin to be updated changes its value to one of its interacting neighbor spins. This movement can be regarded as a random walk in a random environment with a feedback. We investigate this random walk numerically in the case of the classical XY model in 1,2, and 3 dimensions to find that it is superdiffusive near the critical point of the underlying spin system. It is suggested that the performance improvement of the ECMC is related to this anomalous behavior.Comment: 7 pages, 5 figures. (v2) Presentation including plots reorganized. Discussion of exponents in the infinite system size limit adde

Enhanced coherent dynamics near a transition between neutral quantum-paraelectric and ionic ferroelectric phases in the quantum Blume-Emery-Griffiths model

Nonequilibrium dynamics are studied near the quantum phase transition point in the one-dimensional quantum Blume-Emery-Griffiths model. Its pseudo-spin component $S^z$ represents an electric polarization, and $(S^z)^2$ corresponds to ionicity, in mixed-stack charge-transfer complexes that exhibit a transition between neutral quantum-paraelectric and ionic ferroelectric (or antiferroelectric) phases. The time-dependent Schr\"odinger equation is solved for the exact many-body wave function in the quantum paraelectric phase. After impact force is introduced on a polarization locally in space and time, polarizations and ionicity coherently oscillate. The oscillation amplitudes are large near the quantum phase transition point. The energy supplied by the impact flows linearly into these oscillations, so that the nonequilibrium behavior is uncooperative.Comment: 6 pages, 4 figures, accepted for publication in Phys. Rev.

Marketization of Care and Gendered Cross-Border Migration from Indonesia to Malaysia: The Case of Indonesian Female Migrant Domestic Workers in/to Malaysia.

Introduction For the last two decades, the rights of domestic workers have drawn attention from academia, policy makers, NGO workers and human rights activists. The International Labour Organization (ILO) (2011) estimates that there are currently 53 to 100 million domestic workers worldwide (around 83% of whom are women and girls), and many of them, especially the female live-in migrant domestic workers (MDWs), are working under precarious conditions without any labour rights. Since domestic work is undervalued and poorly regulated, domestic workers remain overworked, underpaid and unprotected. Media reports have increasingly highlighted the plight of MDWs in the different parts of world who suffer from maltreatment, such as control of mobility through withholding identity papers, physical abuse, sexual harassment, overtime work and wage denial. Yet, public authorities have been reluctant to intervene in the defense of domestic workers, primarily because domestic work is regarded as a “private” issue within the family. Government intervention mainly takes the form of banning the migration of women in low-skilled sectors altogether or domestic workers specifically, rather than finding measures to protect the rights of these migrant