Emergent Fermi surface in a many-body non-Hermitian fermionic chain
Sen Mu, Ching Hua Lee, Linhu Li, Jiangbin Gong
Abstract
Fermion accumulation due to asymmetric pumping in a one-dimensional chain is found not only to resemble a Fermi surface in real space, but also to behave like a genuine Fermi surface in its entropy scaling behavior. Nearest-neighbor repulsion is also found to induce competing charge density waves that may erode the real-space Fermi surface. The underlying physics surrounding criticality and localization is further analyzed with complex spectral flows, highlighting the interplay between quantum degenerate pressure, non-Hermitian pumping, and many-body effects.
Topics & Concepts
PhysicsQuantum entanglementPosition and momentum spaceOptical latticeFermionHermitian matrixFermi surfaceFermi Gamma-ray Space TelescopeQuantum mechanicsQuantumTheoretical physicsCondensed matter physicsElectronSuperfluidityQuantum, superfluid, helium dynamicsQuantum Mechanics and Non-Hermitian PhysicsCold Atom Physics and Bose-Einstein Condensates