Journal
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
Volume 62, Issue 4, Pages -Publisher
SCIENCE PRESS
DOI: 10.1007/s11433-018-9319-3
Keywords
Dirac semimetals; diamond anvil cells; X-ray diffraction; transport measurement; band structure calculation
Categories
Funding
- National Key Research Program of China [2016YFA0300702]
- National Basic Research Program of China [2014CB921104]
- Shanghai Municipal Natural Science Foundation [18JC1411400, 18ZR1403200, 17ZR1442400]
- National Natural Science Foundation of China [U1530402, 11674188]
- China Postdoctoral Science Foundation [2017M610221]
- Shanghai Sailing Program [17YF1429000]
- National Postdoctoral Program for Innovative Talents [BX201600036]
- COMPRES through the Partnership for Extreme Crystallography (PX2) project, under NSF [11-57758]
- DOE-NNSA [DE-NA0001974]
- DOE-BES [DE-FG02-99ER45775, DE-AC02-06CH11357]
- NSF
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Numerous exotic properties have been discovered in Dirac Semimetals (DSMs) and Weyl Semimetals (WSMs). In a given DSM/ WSM, the Dirac/Weyl nodes usually coexist with other bulk states, making their respective contribution elusive. In this work, we distinguish the role of bulk states from the tilted Dirac nodes on the transport properties in DSMs. Specifically, we applied pressure to a type-II DSM material, PtTe2, and studied its pressure modified electronic and lattice structure systematically by using in situ transport measurements and X-ray diffraction (XRD). A pressure-induced transition at about 20 GPa is revealed in the transport properties, while the layered lattice structure is robust against pressure as illustrated in XRD measurement results. Density functional theory (DFT) calculations suggest that this is originated from the Lifshitz transition in the bulk states. Our findings provide evidence to identify the bulk states' influence on transport from the topologically-protected DSM states in the DSM material.
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