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Spin transport properties in a topological insulator sandwiched between two-dimensional magnetic layers.
Sci Rep
January 2025
Department of Applied Physics, School of Engineering Sciences, KTH Royal Institute of Technology, AlbaNova University Center, SE-10691, Stockholm, Sweden.
Non-trivial band topology along with magnetism leads to different novel quantum phases. When time-reversal symmetry is broken in three-dimensional topological insulators (TIs) through, e.g.
View Article and Find Full Text PDFAnomalous pumping in the non-Hermitian Rice-Mele model.
J Phys Condens Matter
January 2025
School of Physical Sciences, NISER, Jatni, Bhubaneswar, 752050, INDIA.
We study topological charge pumping (TCP) in the Rice-Mele (RM) model with irreciprocal hopping. The non-Hermiticity gives rise to interesting pumping physics, owing to the presence of skin effect and exceptional points. In the static one-dimensional (1D) RM model, we find two independent tuning knobs that can drive the topological transition, namely, non-Hermitian parameter $\gamma$ and system size $N$.
View Article and Find Full Text PDFAnomalous pumping in the non-Hermitian Rice-Mele model.
J Phys Condens Matter
January 2025
School of Physical Sciences, NISER, Jatni, Bhubaneswar, 752050, INDIA.
We study topological charge pumping (TCP) in the Rice-Mele (RM) model with irreciprocal hopping. The non-Hermiticity gives rise to interesting pumping physics, owing to the presence of skin effect and exceptional points. In the static one-dimensional (1D) RM model, we find two independent tuning knobs that can drive the topological transition, namely, non-Hermitian parameter $\gamma$ and system size $N$.
View Article and Find Full Text PDFPhase transitions in chromatin: Mesoscopic and mean-field approaches.
J Chem Phys
January 2025
CNRS, Laboratoire PHENIX (Physicochimie des Electrolytes et Nanosystèmes Interfaciaux), Sorbonne Université, 4 Place Jussieu, 75005 Paris, France.
By means of a minimal physical model, we investigate the interplay of two phase transitions at play in chromatin organization: (1) liquid-liquid phase separation within the fluid solvating chromatin, resulting in the formation of biocondensates; and (2) the coil-globule crossover of the chromatin fiber, which drives the condensation or extension of the chain. In our model, a species representing a domain of chromatin is embedded in a binary fluid. This fluid phase separates to form a droplet rich in a macromolecule (B).
View Article and Find Full Text PDFCorner Charge Fluctuation as an Observable for Quantum Geometry and Entanglement in Two-Dimensional Insulators.
Phys Rev Lett
December 2024
Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Measuring bipartite fluctuations of a conserved charge, such as the particle number, is a powerful approach to understanding quantum systems. When the measured region has sharp corners, the bipartite fluctuation receives an additional contribution known to exhibit a universal angle dependence in 2D isotropic and uniform systems. Here we establish that, for generic lattice systems of interacting particles, the corner charge fluctuation is directly related to quantum geometry.
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