Nonlinear spectra of spinons and holons in short GaAs quantum wires.
Nonlinear spectra of spinons and holons in short GaAs quantum wires.
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DOI：
10.1038/ncomms12784
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发表时间：
2016-09-15
影响因子：
16.6
通讯作者：
Schofield AJ
中科院分区：
文献类型：
--
作者：
Moreno M;Ford CJ;Jin Y;Griffiths JP;Farrer I;Jones GA;Ritchie DA;Tsyplyatyev O;Schofield AJ
一维电子流体是一种特殊的导电系统，其中相互作用的基本作用导致了奇异的、新出现的现象，如自旋-电荷(自旋-合弄)分离。线性Luttinger液体理论成功地描述了这些一维金属的独特的低能性质，但描述它们的高能非线性性质的挑战性任务长期以来一直难以捉摸。最近，解释非线性的新的理论方法已经发展，但他们预测的丰富的现象学仍然很少在实验上探索。在这里，我们利用一台由6000根量子线组成的先进装置，用隧道光谱技术研究了GaAs短量子线的非线性光谱特性。我们发现了在粒子扇区的主要区域存在倒转(自旋)阴影带的证据，这是新的非线性理论的中心预测之一。在高能区，有效质量减小的(Holon)带清晰可见。近年来，描述一维电子流体非线性高能激发的理论层出不穷。在这里，作者报道了它们存在的实验证据和它们在短量子线隧道谱中的行为。
One-dimensional electronic fluids are peculiar conducting systems, where the fundamental role of interactions leads to exotic, emergent phenomena, such as spin-charge (spinon-holon) separation. The distinct low-energy properties of these 1D metals are successfully described within the theory of linear Luttinger liquids, but the challenging task of describing their high-energy nonlinear properties has long remained elusive. Recently, novel theoretical approaches accounting for nonlinearity have been developed, yet the rich phenomenology that they predict remains barely explored experimentally. Here, we probe the nonlinear spectral characteristics of short GaAs quantum wires by tunnelling spectroscopy, using an advanced device consisting of 6000 wires. We find evidence for the existence of an inverted (spinon) shadow band in the main region of the particle sector, one of the central predictions of the new nonlinear theories. A (holon) band with reduced effective mass is clearly visible in the particle sector at high energies. Recently, theories have emerged that describe the nonlinear high-energy excitations of one-dimensional electronic fluids. Here, the authors report experimental evidence of their existence and behaviour in tunnelling spectra of short GaAs quantum wires.