Synchronizing Bloch-oscillating free carriers in moiré flat bands
arXiv:2011.09219 · doi:10.1103/PhysRevLett.126.256803
Abstract
Achieving Bloch oscillations of free carriers under a direct current, a long-sought-after collective many-body behavior, has been challenging due to stringent constraints on the band properties. We argue that the flat bands in moiré graphene fulfill the basic requirements for observing Bloch oscillations, offering an appealing alternative to the stacked quantum wells used in previous work aiming to access this regime. Bloch-oscillating moiré superlattices emit a comb-like spectrum of incommensurate frequencies, a property of interest for converting direct currents into high-frequency currents and developing broad-band amplifiers in THz domain. The oscillations can be synchronized through coupling to an oscillator mode in a photonic or plasmonic resonator. Phase-coherent collective oscillations in the resonant regime provide a realization of current-pumped THz lasing.
arXiv comment12pgs 5fgs
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- Irregular Bloch Zener oscillations in two-dimensional flat-band Dirac materials
- Unveiling the Miniband Structure of Graphene Moiré Superlattices via Gate-dependent Terahertz Photocurrent Spectroscopy
- Floquet-Bloch Theory for Nonperturbative Response to a Static Drive
- Quantum Metric-induced Oscillations in Flat Bands
- Optical Absorption and Emission from Wannier-Stark Spectra of Moiré Superlattices
- Multi-tunneling effect of nonreciprocal Landau-Zener tunneling: Insights from DC field responses