Observation of sixfold degenerate fermions in PdSb\(_2\)
Three types of fermions have been extensively studied in topological quantum materials: Dirac, Weyl, and Majorana fermions. Beyond the fundamental fermions in high energy physics, exotic fermions are allowed in condensed matter systems residing in three-, six- or eightfold degenerate band crossings....
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| creator | Yáng, Xiàn Cochran, Tyler A Chapai, Ramakanta Tristant, Damien Jia-Xin, Yin Belopolski, Ilya Chéng, Zǐjiā Multer, Daniel Zhang, Songtian S Shumiya, Nana Litskevich, Maksim Jiang, Yuxiao Chang, Guoqing Zhang, Qi Vekhter, Ilya Shelton, William A Jin, Rongying Su-Yang, Xu M Zahid Hasan |
| description | Three types of fermions have been extensively studied in topological quantum materials: Dirac, Weyl, and Majorana fermions. Beyond the fundamental fermions in high energy physics, exotic fermions are allowed in condensed matter systems residing in three-, six- or eightfold degenerate band crossings. Here, we use angle-resolved photoemission spectroscopy to directly visualize three-doubly-degenerate bands in PdSb\(_2\). The ultrahigh energy resolution we are able to achieve allows for the confirmation of all the sixfold degenerate bands at the R point, in remarkable consistency with first-principles calculations. Moreover, we find that this sixfold degenerate crossing has quadratic dispersion as predicted by theory. Finally, we compare sixfold degenerate fermions with previously confirmed fermions to demonstrate the importance of this work: our study indicates a topological fermion beyond the constraints of high energy physics. |
| doi_str_mv | 10.48550/arxiv.2005.10343 |
| format | Article |
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| subjects | Condensed matter physics Energy resolution Fermions First principles High energy physics Photoelectric emission Topology |
| title | Observation of sixfold degenerate fermions in PdSb\(_2\) |
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