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We demonstrate by means of numerical simulations that (i) - a single DNA molecule subjected to a collinear uniform electric field can exhibit sustained Bloch oscillations and (ii) - these oscillations can be tuned, because of the helicity, by a lateral uniform electric field. The spectrum of Bloch oscillations brakes up into several peaks with frequencies dependent on the amplitude of the gating field. The frequency of oscillations falls into a THz domain, the region which still remains challenging. Thus, the above arrangement may provide us with a single-DNA-based tunable coherent THz oscillator. Being arranged into an array, the DNA molecules may serve as a nano-scale source of coherent THz radiation. |
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