Insulating Josephson Junction Chains as Pinned Luttinger Liquids
Insulating Josephson Junction Chains as Pinned Luttinger Liquids
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DOI：
10.1103/physrevlett.119.167701
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发表时间：
2017-10-18
影响因子：
8.6
通讯作者：
Duty, Timothy
中科院分区：
文献类型：
--
作者：
Cedergren, Karin;Ackroyd, Roger;Duty, Timothy
一维空间的量子物理非常丰富，但即使有强相互作用和无序，也令人惊讶地易于处理。这是因为几乎所有一维系统的低能物理都可以用Luttinger液体来描述，这是一个与更高维度的费米液体相似的关键概念。虽然已经有许多理论建议使用约瑟夫森结的线性链和阶梯来创建新的量子相位和器件，但在实验上只取得了适度的进展。一个主要的障碍是理解无序在这种系统中的作用。我们目前的实验结果，建立绝缘状态的线性链的亚微米约瑟夫森结作为Luttinger液体钉扎的随机偏移电荷，提供了一个一维的实现玻色玻璃，强烈验证了量子多体理论的一维无序系统。这种电子玻璃在约瑟夫森结链中的普遍存在对于它们作为基本电流标准的建议用途具有重要意义，该标准基于通量量子的相干隧穿（量子相位滑移）的同步。
Quantum physics in one spatial dimension is remarkably rich, yet even with strong interactions and disorder, surprisingly tractable. This is due to the fact that the low-energy physics of nearly all onedimensional systems can be cast in terms of the Luttinger liquid, a key concept that parallels that of the Fermi liquid in higher dimensions. Although there have been many theoretical proposals to use linear chains and ladders of Josephson junctions to create novel quantum phases and devices, only modest progress has been made experimentally. One major roadblock has been understanding the role of disorder in such systems. We present experimental results that establish the insulating state of linear chains of submicron Josephson junctions as Luttinger liquids pinned by random offset charges, providing a onedimensional implementation of the Bose glass, strongly validating the quantum many-body theory of onedimensional disordered systems. The ubiquity of such an electronic glass in Josephson-junction chains has important implications for their proposed use as a fundamental current standard, which is based on synchronization of coherent tunneling of flux quanta (quantum phase slips).