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| http://dx.doi.org/10.1073/pnas.1908786116 | DOI Listing |
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Non-Hermitian pseudo-gaps.
Sci Bull (Beijing)
April 2022
Department of Physics, National University of Singapore, Singapore 117551, Singapore. Electronic address:
The notion of a band gap is ubiquitous in the characterization of matter. Particularly interesting are pseudo-gaps, which are enigmatic regions of very low density of states that have been linked to novel phenomena like high temperature superconductivity. In this work, we discover a novel origin for pseudo-gaps when boundaries are introduced in a non-Hermitian lattice.
View Article and Find Full Text PDFQuantum critical points and the sign problem.
Science
January 2022
Department of Physics, University of California, Davis, CA 95616, USA.
The "sign problem" (SP) is a fundamental limitation to simulations of strongly correlated matter. It is often argued that the SP is not intrinsic to the physics of particular Hamiltonians because its behavior can be influenced by the choice of algorithm. By contrast, we show that the SP in determinant quantum Monte Carlo (QMC) is quantitatively linked to quantum critical behavior.
View Article and Find Full Text PDFSignatures of the spatial extent of plastic events in the yielding transition in amorphous solids.
Phys Rev E
September 2021
Department of Physics and Astronomy and Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver BC V6T 1Z1, Canada.
Amorphous solids are yield stress materials that flow when a sufficient load is applied. Their flow consists of periods of elastic loading interrupted by rapid stress drops, or avalanches, coming from microscopic rearrangements known as shear transformations (STs). Here we show that the spatial extent of avalanches in a steadily sheared amorphous solid has a profound effect on the distribution of local residual stresses that in turn determines the stress drop statistics.
View Article and Find Full Text PDFAt the Limits of Isolobal Bonding: π-Based Covalent Magnetism in MnHg.
Inorg Chem
September 2020
Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States.
Magnetic ordering in inorganic materials is generally considered to be a mechanism for structures to stabilize open shells of electrons. The intermetallic phase MnHg represents a remarkable exception: its crystal structure is in accordance with the 18- bonding scheme and non-spin-polarized density functional theory (DFT) calculations show a corresponding pseudogap near its Fermi energy. Nevertheless, it exhibits strong antiferromagnetic ordering virtually all the way up to its decomposition temperature.
View Article and Find Full Text PDFLinking the pseudogap in the cuprates with local symmetry breaking: A commentary.
Proc Natl Acad Sci U S A
July 2019
Department of Physics, Cornell University, Ithaca, NY 14850
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