Gap-Opening Transition in Dirac Semimetal ZrTe5

Autor:	Yefan Tian, Nader Ghassemi, Joseph H. Ross
Rok vydání:	2021
Předmět:	Physics Condensed matter physics Dirac (software) General Physics and Astronomy Quantum Hall effect 01 natural sciences Semimetal Magnetic field Pairing 0103 physical sciences 010306 general physics Spectroscopy Spin (physics) Charge density wave
Zdroj:	Physical Review Letters. 126
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.126.236401
Popis:	We apply $^{125}\mathrm{Te}$ nuclear magnetic resonance (NMR) spectroscopy to investigate the Dirac semimetal ${\mathrm{ZrTe}}_{5}$. With the NMR magnetic field parallel to the $b$ axis, we observe significant quantum magnetic effects. These include an abrupt drop at 150 K in spin-lattice relaxation rate. This corresponds to a gap-opening transition in the Dirac carriers, likely indicating the onset of excitonic pairing. Below 50 K, we see a more negative shift for the ${\mathrm{Te}}_{z}$ bridging site, indicating the repopulation of Dirac levels with spin polarized carriers at these temperatures. This is the previously reported 3D quantum Hall regime; however, we see no sign of a charge density wave as has been proposed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bb632a6894f00a2f537f063fba80a614 https://doi.org/10.1103/physrevlett.126.236401 Zobrazit plný text záznamu