Observation of bulk nodal lines in topological semimetal ZrSiS

Binbin Fu; Changjiang Yi; Tiantian Zhang; Marco Caputo; Junzhang Ma; Xin Gao; Baiqing Lv; Lingyuan Kong; Yaobo Huang; Ming Shi; Strokov Vladimir; Chen Fang; Hongming Weng; Youguo Shi; Tian Qian; Hong Ding

arXiv · 1712.00782

Observation of bulk nodal lines in topological semimetal ZrSiS

Binbin Fu·Changjiang Yi·Tiantian Zhang·Marco Caputo·Junzhang Ma·Xin Gao·Baiqing Lv·Lingyuan Kong·Yaobo Huang·Ming Shi·Strokov Vladimir·Chen Fang·Hongming Weng·Youguo Shi·Tian Qian·Hong Ding

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Abstract

ZrSiS is the most intensively studied topological nodal-line semimetal candidate, which is proposed to host multiple nodal lines in its bulk electronic structure. However, previous angle-resolved photoemission spectroscopy (ARPES) experiments with vacuum ultraviolet lights mainly probed the surface states. Here using bulk-sensitive soft X-ray ARPES, we acquire the bulk electronic states of ZrSiS without any interference from surface states. Our results clearly show two groups of three-dimensional bulk nodal lines located on high-symmetry planes and along high-symmetry lines in the bulk Brillouin zone, respectively. The nodal lines on high-symmetry planes are enforced to pin at the Fermi level by carrier compensation and constitute the whole Fermi surfaces. This means that the carriers in ZrSiS are entirely contributed by nodal-line fermions, suggesting that ZrSiS is a remarkable platform for studying physical properties related to nodal lines.

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Binbin Fu, Changjiang Yi, Tiantian Zhang, Marco Caputo, Junzhang Ma, Xin Gao, Baiqing Lv, Lingyuan Kong, Yaobo Huang, Ming Shi, Strokov Vladimir, Chen Fang, Hongming Weng, Youguo Shi, Tian Qian, Hong Ding. 2017-12-03. Observation of bulk nodal lines in topological semimetal ZrSiS. https://arxiv.org/abs/1712.00782

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