Direct observation of Klein tunneling in phononic crystals

doi:10.1126/science.abe2011

GSTDTAP > 气候变化

DOI	10.1126/science.abe2011
	Direct observation of Klein tunneling in phononic crystals
	Xue Jiang; Chengzhi Shi; Zhenglu Li; Siqi Wang; Yuan Wang; Sui Yang; Steven G. Louie; Xiang Zhang
	2020-12-18
发表期刊	Science
出版年	2020
英文摘要	The ability of particles to tunnel through barriers is an important property of quantum mechanical systems, and the extent of the effect is strongly dependent on the properties of the barrier. By contrast, Klein tunneling can exhibit unity transmission that is independent of the width and height of the energy barrier, but direct evidence for this effect remains elusive. Using a phononic system comprising a periodic array of dielectric pillars, Jiang et al. provide evidence for the direct observation of Klein tunneling. Near-unity transmission of acoustic excitations was observed across the barrier independently of its width and height. This ability to tune the effect by controlling the size of the junctions and the frequency of incident waves provides a promising platform to explore complex nontrivial physics and applications in signal processing and information communications. Science , this issue p. [1447][1] Tunneling plays an essential role in many branches of physics and has found important applications. It is theoretically proposed that Klein tunneling occurs when, under normal incidence, quasiparticles exhibit unimpeded penetration through potential barriers independent of their height and width. We created a phononic heterojunction by sandwiching two types of artificial phononic crystals with different Dirac point energies. The direct observation of Klein tunneling as shown by the key feature of unity transmission is demonstrated. Our experiment reveals that Klein tunneling occurs over a broad band of acoustic frequency. The direct observation of Klein tunneling in phononic crystals could find applications in signal processing, supercollimated beams, and communications. [1]: /lookup/doi/10.1126/science.abe2011
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/308363
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Xue Jiang,Chengzhi Shi,Zhenglu Li,et al. Direct observation of Klein tunneling in phononic crystals[J]. Science,2020.
APA	Xue Jiang.,Chengzhi Shi.,Zhenglu Li.,Siqi Wang.,Yuan Wang.,...&Xiang Zhang.(2020).Direct observation of Klein tunneling in phononic crystals.Science.
MLA	Xue Jiang,et al."Direct observation of Klein tunneling in phononic crystals".Science (2020).