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To a large extent, the low-energy physics of fractional quantum Hall (FQH) states, a paradigm of strongly correlated topological phases of matter, is captured by weakly interacting quasiparticles known as composite fermions. In this talk, I will demonstrate that some high-energy states in the FQH spectra necessitate a different description based on parton quasiparticles. The Jain states at filling factor \nu = n/(2pn \pm 1) with integers n, p \ge 2 support two kinds of collective modes: In addition to the well-known Girvin-MacDonald-Platzman (GMP) mode, they host a high-energy collective mode, which we interpret as the GMP mode of partons. I will also present a microscopic wave function for the parton mode and demonstrate agreement between its variational energy and exact diagonalization. These results point to partons being ``real" quasiparticles which, in a way reminiscent of quarks, become observable only at sufficiently high energies.
Reference: Very-High-Energy Collective States of Partons in Fractional Quantum Hall Liquids, Ajit C. Balram, Zhao Liu, Andrey Gromov, and Zlatko Papić, Phys. Rev. X 12, 021008 (2022) |