Topological orders of monopoles and hedgehogs: From electronic and magnetic spin-orbit coupling to quarks
Abstract
Topological states of matter are, generally, quantum liquids of conserved topological defects. We establish this by constructing and analyzing topological field theories which introduce gauge fields to describe the dynamics of singularities in the original field configurations. In this work, homotopy groups are utilized to identify topologically protected singularities, and the conservation of their protected number is captured by a topological action term that unambiguously obtains from the given set of symmetries. Stable phases of these theories include quantum liquids with emergent massless Abelian and non-Abelian gauge fields, as well as topological orders with long-range quantum entanglement, fractional excitations, boundary modes, and unconventional responses to external perturbations. This paper focuses on the derivation of topological field theories and basic phenomenological characterization of topological orders associated with homotopy groups πn(Sn), n ≥ 1 . These homotopies govern monopole and hedgehog topological defects in d = n + 1 dimensions, and enable the generalization of both weakly interacting and fractional quantum Hall liquids of vortices to d > 2 . Hedgehogs have not been in the spotlight so far, but they are particularly important defects of magnetic moments because they can be stimulated in realistic systems with spin-orbit coupling, such as chiralmore »
- Authors:
-
- George Mason Univ., Fairfax, VA (United States); Johns Hopkins Univ., Baltimore, MD (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Institute for Quantum Matter (IQM); Johns Hopkins Univ., Baltimore, MD (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); USDOE
- OSTI Identifier:
- 1767746
- Alternate Identifier(s):
- OSTI ID: 1607797
- Grant/Contract Number:
- SC0019331; PHY-1607611
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 101; Journal Issue: 11; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; optics; thermal conductivity; defects; charge transport; superconductivity; magnetism and spin physics; quantum information science; materials and chemistry by design; synthesis (novel materials)
Citation Formats
Nikolić, Predrag. Topological orders of monopoles and hedgehogs: From electronic and magnetic spin-orbit coupling to quarks. United States: N. p., 2020.
Web. doi:10.1103/PhysRevB.101.115144.
Nikolić, Predrag. Topological orders of monopoles and hedgehogs: From electronic and magnetic spin-orbit coupling to quarks. United States. https://doi.org/10.1103/PhysRevB.101.115144
Nikolić, Predrag. Mon .
"Topological orders of monopoles and hedgehogs: From electronic and magnetic spin-orbit coupling to quarks". United States. https://doi.org/10.1103/PhysRevB.101.115144. https://www.osti.gov/servlets/purl/1767746.
@article{osti_1767746,
title = {Topological orders of monopoles and hedgehogs: From electronic and magnetic spin-orbit coupling to quarks},
author = {Nikolić, Predrag},
abstractNote = {Topological states of matter are, generally, quantum liquids of conserved topological defects. We establish this by constructing and analyzing topological field theories which introduce gauge fields to describe the dynamics of singularities in the original field configurations. In this work, homotopy groups are utilized to identify topologically protected singularities, and the conservation of their protected number is captured by a topological action term that unambiguously obtains from the given set of symmetries. Stable phases of these theories include quantum liquids with emergent massless Abelian and non-Abelian gauge fields, as well as topological orders with long-range quantum entanglement, fractional excitations, boundary modes, and unconventional responses to external perturbations. This paper focuses on the derivation of topological field theories and basic phenomenological characterization of topological orders associated with homotopy groups πn(Sn), n ≥ 1 . These homotopies govern monopole and hedgehog topological defects in d = n + 1 dimensions, and enable the generalization of both weakly interacting and fractional quantum Hall liquids of vortices to d > 2 . Hedgehogs have not been in the spotlight so far, but they are particularly important defects of magnetic moments because they can be stimulated in realistic systems with spin-orbit coupling, such as chiral magnets and d = 3 topological materials. We predict topological orders in systems with U(1) × Spin(d) symmetry in which fractional electric charge attaches to hedgehogs. Monopoles, the analogous defects of charge or generic U(1) currents, may bind to hedgehogs via Zeeman effect, or effectively emerge in purely magnetic systems. The latter can lead to spin liquids with different topological orders than that of the resonant valence bond spin liquid. Charge fractionalization of quarks in atomic nuclei is also seen as possibly arising from the charge-hedgehog attachment.},
doi = {10.1103/PhysRevB.101.115144},
journal = {Physical Review B},
number = 11,
volume = 101,
place = {United States},
year = {Mon Mar 30 00:00:00 EDT 2020},
month = {Mon Mar 30 00:00:00 EDT 2020}
}
Web of Science
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