Тип публикации: статья из журнала
Год издания: 2015
Идентификатор DOI: 10.1103/PhysRevA.91.053631
Ключевые слова: Ladders, Analytical expressions, One-dimensional lattice, Periodic lattices, Quantum particles, Static fields, Strong-coupling regime, Two-level system, Wannier-Stark ladder, Superlattices
Аннотация: We analyze the Wannier-Stark spectrum of a quantum particle in generic one-dimensional double-periodic lattices. In the limit of a weak static field, the spectrum is shown to be a superposition of two Wannier-Stark ladders originating from two Bloch subbands. As the strength of the field is increased, the spectrum rearranges itselfПоказать полностьюinto a single Wannier-Stark ladder. We derive analytical expressions that describe the rearrangement employing the analogy between the Wannier-Stark problem and a driven two-level system in the strong-coupling regime.
Журнал: PHYSICAL REVIEW A
Выпуск журнала: Vol. 91, Is. 5
ISSN журнала: 10502947
Место издания: COLLEGE PK
Издатель: AMER PHYSICAL SOC