Chaos-Assisted Dynamical Tunneling in Flat Band Superwires

Recent theoretical investigations have revealed unconventional transport mechanisms within high Brillouin zones of two-dimensional superlattices. Electrons can navigate along channels we call superwires, gently guided without brute force confinement. Such dynamical confinement is caused by weak supe...

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Bibliographic Details
Published in:Entropy (Basel, Switzerland) Switzerland), 2024-06, Vol.26 (6), p.492
Main Authors: Graf, Anton M, Lin, Ke, Kim, MyeongSeo, Keski-Rahkonen, Joonas, Daza, Alvar, Heller, Eric J
Format: Article
Language:English
Subjects:
Approximation
Brillouin zones
Channels
Chaos theory
chaos-assisted tunneling
Confinement
dynamical tunneling
Eigenvectors
Electrons
Energy
flat bands
Gases
Graphene
Investigations
Nanotechnology devices
non-integrable systems
Physics
Superconductivity
Superlattices
superwires
Waveguides
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Summary:Recent theoretical investigations have revealed unconventional transport mechanisms within high Brillouin zones of two-dimensional superlattices. Electrons can navigate along channels we call superwires, gently guided without brute force confinement. Such dynamical confinement is caused by weak superlattice deflections, markedly different from the static or energetic confinement observed in traditional wave guides or one-dimensional electron wires. The quantum properties of superwires give rise to elastic dynamical tunneling, linking disjoint regions of the corresponding classical phase space, and enabling the emergence of several parallel channels. This paper provides the underlying theory and mechanisms that facilitate dynamical tunneling assisted by chaos in periodic lattices. Moreover, we show that the mechanism of dynamical tunneling can be effectively conceptualized through the lens of a paraxial approximation. Our results further reveal that superwires predominantly exist within flat bands, emerging from eigenstates that represent linear combinations of conventional degenerate Bloch states. Finally, we quantify tunneling rates across various lattice configurations and demonstrate that tunneling can be suppressed in a controlled fashion, illustrating potential implications in future nanodevices.
ISSN:1099-4300
1099-4300
DOI:10.3390/e26060492