Journal
PHYSICAL REVIEW B
Volume 100, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.100.235101
Keywords
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Funding
- Shenzhen Peacock Plan [KQTD2016053112042971]
- Science and Technology Planning Project of Guangdong Province [2016B050501005]
- US Department of Energy (DOE), Office of Science, Basic Energy Sciences [DE-FG02-07ER46352]
- Northeastern University Advanced Scientific Computation Center through DOE Grant [DE-AC02-05CH11231]
- Northeastern University National Energy Research Scientific Computing Center through DOE Grant [DE-AC02-05CH11231]
- Young Scholar Fellowship Program by Ministry of Science and Technology (MOST) in Taiwan, under MOST Grant for the Columbus Program [MOST107-2636-M-006-004]
- National Cheng Kung University, Taiwan
- National Center for Theoretical Sciences (NCTS), Taiwan
- MOST, Taiwan [MOST 107-2627-E-006-001]
- Academia Sinica, Taiwan [AS-iMATE-107-11]
- CSIR
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Saddle-point Van Hove singularities in the topological surface states are interesting because they can provide a new pathway for accessing exotic correlated phenomena in topological materials. Here, based on first-principles calculations combined with a k . p model Hamiltonian analysis, we show that the layered platinum mineral jacutingaite (Pt2HgSe3) harbors saddlelike topological surface states with associated Van Hove singularities. Pt2HgSe3 is shown to host two distinct types of nodal lines without spin-orbit coupling (SOC), which are protected by combined inversion (I) and time-reversal (T) symmetries. Switching on the SOC gaps out the nodal lines and drives the system into a topological state with nonzero weak topological invariant Z(2) = (0; 001) and mirror Chern number n(m) = -2. Surface states on the naturally cleaved (001) surface are found to be nontrivial with a unique saddlelike energy dispersion with type II Van Hove singularities. We also discuss how modulating the crystal structure can drive Pt2HgSe3 into a Dirac semimetal state with a pair of Dirac points. Our results indicate that Pt2HgSe3 is an ideal candidate material for exploring the properties of topological insulators with saddlelike surface states.
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