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Non-Bloch Band Theory of Non-Hermitian Systems

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arxiv 1902.10958 v2 pith:KU3C6HUB submitted 2019-02-28 cond-mat.mes-hall

Non-Bloch Band Theory of Non-Hermitian Systems

classification cond-mat.mes-hall
keywords bandsystemstheorynon-hermitianblochbrillouinopenperiodic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In spatially periodic Hermitian systems, such as electronic systems in crystals, the band structure is described by the band theory in terms of the Bloch wave functions, which reproduce energy levels for large systems with open boundaries. In this paper, we establish a generalized Bloch band theory in one-dimensional spatially periodic tight-binding models. We show how to define the Brillouin zone in non-Hermitian systems. From this Brillouin zone, one can calculate continuum bands, which reproduce the band structure in an open chain. As an example, we apply our theory to the non-Hermitian Su-Schrieffer-Heeger model. We also show the bulk-edge correspondence between the winding number and existence of the topological edge states.

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Cited by 2 Pith papers

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  2. Extracting Boundary Conformal Data from Periodic Non-Hermitian Critical Chains

    cond-mat.stat-mech 2026-06 conditional novelty 7.0

    Periodic-chain projected overlaps with paired left duals extract universal boundary CFT coefficients, including a negative Yang-Lee ratio and complex Potts boundary data.