Corpus ID: 119241906

Non-Hermitian Topological Theory of Finite-Lifetime Quasiparticles: Prediction of Bulk Fermi Arc Due to Exceptional Point

  title={Non-Hermitian Topological Theory of Finite-Lifetime Quasiparticles: Prediction of Bulk Fermi Arc Due to Exceptional Point},
  author={Vladyslav Kozii and Liang Fu},
  journal={arXiv: Mesoscale and Nanoscale Physics},
  • V. Kozii, L. Fu
  • Published 19 August 2017
  • Physics
  • arXiv: Mesoscale and Nanoscale Physics
We introduce a topological theory to study quasiparticles in interacting and/or disordered many-body systems, which have a finite lifetime due to inelastic and/or elastic scattering. The one-body quasiparticle Hamiltonian includes both the Bloch Hamiltonian of band theory and the self-energy due to interactions, which is non-Hermitian when quasiparticle lifetime is finite. We study the topology of non-Hermitian quasiparticle Hamiltonians in momentum space, whose energy spectrum is complex. The… Expand

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