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Anomalous Hall Effect and Quantum Criticality in Geometrically Frustrated Heavy Fermion Metals.
Phys Rev Lett
September 2024
Department of Physics & Astronomy, Rice University, Houston, Texas 77005, USA.
Studies on the heavy-fermion pyrochlore iridate (Pr_{2}Ir_{2}O_{7}) point to the role of time-reversal-symmetry breaking in geometrically frustrated Kondo lattices. Here, we address the effect of Kondo coupling and chiral spin liquids in a J_{1}-J_{2} model on a square lattice and a model on a kagome lattice via a large-N method, based on a fermionic representation of the spin operators, and consider a new mechanism for anomalous Hall effect for the chiral phases. We calculate the anomalous Hall response for the chiral states of both the Kondo destroyed and Kondo screened phases.
View Article and Find Full Text PDFCelestial Dual for Maximal Helicity Violating Amplitudes.
Phys Rev Lett
August 2024
Center for the Fundamental Laws of Nature, Harvard University, Cambridge, Massachusetts, USA.
It is shown that a 2D conformal field theory consisting of a central charge c Liouville theory, a chiral level one, rank N Kac-Moody algebra, and a weight -3/2 free fermion holographically generate 4D maximal helicity violating tree-level scattering amplitudes. The correlators of this 2D conformal field theory give directly the 4D leaf amplitudes associated to a single hyperbolic slice of flat space. The 4D celestial amplitudes arise in a large-N and semiclassical large-c limit, according to the holographic dictionary, as a translationally invariant combination of leaf amplitudes.
View Article and Find Full Text PDFLarge-N Principal Chiral Model in Arbitrary External Fields.
Phys Rev Lett
April 2024
Nordita, KTH Royal Institute of Technology and Stockholm University, Stockholm, Sweden and Niels Bohr Institute, Copenhagen University, Copenhagen, Denmark.
We report the explicit solution for the vacuum state of the two-dimensional SU(N) principal chiral model at large N for an arbitrary set of chemical potentials and any interaction strength, a unique result of such kind for an asymptotically free quantum field theory. The solution matches one-loop perturbative calculation at weak coupling, and in the opposite strong-coupling regime exhibits an emergent spacial dimension from the continuum limit of the SU(N) Dynkin diagram.
View Article and Find Full Text PDFQuasi-2D Ruddlesden-Popper-type perovskites (RPPs) exhibit excellent nonlinear optical properties due to their multiple quantum well structures with large exciton binding energy. Herein, we introduce chiral organic molecules into RPPs and investigate their optical properties. It is found that the chiral RPPs possess effective circular dichroism in the ultraviolet to visible wavelengths.
View Article and Find Full Text PDFCircularly Polarized Photoluminescence of Chiral 2D Halide Perovskites at Room Temperature.
ACS Appl Mater Interfaces
December 2022
Department of Physics, National Taiwan Normal University, Taipei11677, Taiwan, R.O.C.
Chiral halide perovskites have attracted considerable attention because of their chiroptical, second-harmonic generation, and ferroelectricity properties and their potential application in chiroptoelectronics and chiral spintronics. However, the fundamental research of these properties is insufficient. In this work, chiral perovskites were synthesized using precursor solutions with various stoichiometric ratios ⟨⟩.
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