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Physics of emergence beyond Berezinskii-Kosterlitz-Thouless transition for interacting topological quantum matter.
Sci Rep
July 2022
Theoretical Sciences Division, Poornaprajna Institute of Scientific Research, Bidalur, Bengaluru, 562164, India.
An attempt is made to find different emergent quantum phases for interacting topological state of quantum matter. Our study is based on the quantum field theoretical renormalization group (RG) calculations. The behaviour of the RG flow lines give the emergence of different quantum phases for non-interacting and interacting topological state of quantum matter.
View Article and Find Full Text PDFBilayer Coulomb phase of two-dimensional dimer models: Absence of power-law columnar order.
Phys Rev E
April 2021
Department of Theoretical Physics, Tata Institute of Fundamental Research, Mumbai 400 005, India.
Using renormalization group (RG) analyses and Monte Carlo (MC) simulations, we study the fully packed dimer model on the bilayer square lattice with fugacity equal to z (1) for interlayer (intralayer) dimers, and intralayer interaction V between neighboring parallel dimers on any elementary plaquette in either layer. For a range of not-too-large z>0 and repulsive interactions 0
Quantum chaos challenges many-body localization.
Phys Rev E
December 2020
Department of Theoretical Physics, J. Stefan Institute, SI-1000 Ljubljana, Slovenia.
Characterizing states of matter through the lens of their ergodic properties is a fascinating new direction of research. In the quantum realm, the many-body localization (MBL) was proposed to be the paradigmatic ergodicity breaking phenomenon, which extends the concept of Anderson localization to interacting systems. At the same time, random matrix theory has established a powerful framework for characterizing the onset of quantum chaos and ergodicity (or the absence thereof) in quantum many-body systems.
View Article and Find Full Text PDFPhase transitions in the classical exchange-anisotropic Kitaev-Heisenberg model.
Phys Rev E
October 2020
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, and Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.
The Kitaev model on the honeycomb lattice has been receiving substantial attention due to the discovery of quantum spin liquid state associated with this model. Consequently, its classical partners such as the Kitaev-Heisenberg (KH) model and associated phase transitions become concerned. Specifically, an intermediate Kosterlitz-Thouless (KT) phase engaged in the transition from the high-temperature (T) disordered state to the low-T sixfold degenerate state is predicted in the isotropic KH model [Phys.
View Article and Find Full Text PDFEffects of Random Domains on the Zero Hall Plateau in the Quantum Anomalous Hall Effect.
Phys Rev Lett
January 2019
International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
Recently, a zero Hall conductance plateau with random domains was experimentally observed in the quantum anomalous Hall (QAH) effect. We study the effects of random domains on the zero Hall plateau in QAH insulators. We find that the structure inversion symmetry determines the scaling property of the zero Hall plateau transition in the QAH systems.
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