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It is learned from the Center for High Magnetic Field Science of the Chinese Academy of Sciences that the research team of the researcher Tian Mingliang from the center found the layered structure by measuring the quantum transport characteristics of the layered structure of PtBi2 under a high magnetic field of 40 Tesla and calculating the first-principles energy band.
PtBi2 is a new class of triple-degenerate topological semimetal
.
? Topological semi-metallic materials have unique magnetic transport properties, such as chiral negative magnetoresistance, giant magnetoresistance, and extremely high carrier mobility.
They have important value in the application of low-energy electronic devices in the future, and thus become One of the frontiers and hot research directions of international condensed matter physics research
.
? There are three topological semi-metallic materials discovered in previous experiments, namely Dirac semi-metal, Weyl semi-metal, nodal-line semi-metal, and the quasi-particles contained in the three materials are all It is a fourfold or twofold degenerate fermion, that is, two or four semi-odd spin numbers exist at the same time in the same energy state
.
However, it is only confirmed that there are triple degenerate fermions in tungsten-carbon materials WC and MoP
.
? Researchers prepared high-quality layered PtBi2 single crystal samples with triangular lattice characteristics, and used the water-cooled magnets and hybrid magnets of the steady-state strong magnetic field experimental device to perform detailed characterization studies on their magnetic transport properties, and further used the first The principle method has studied the energy band structure of layered PtBi2
.
The results show that the layered structure of PtBi2 is a new type of triple-degenerate topological semimetal, and has two major characteristics.
One is that the triple-degenerate point of PtBi2 is closer to the Fermi surface than WC and MoP.
Corresponding to the characteristics of novel fermions
.
The second is that the layered PtBi2 is easy to cleavage and has natural advantages in the preparation of devices, which has important application potential for the preparation of small-sized micro-nano devices and performance control
.
? This research work is of great significance to promote people's understanding of electronic topological states, discover novel physical phenomena, develop new electronic devices, and deeply understand the properties of elementary particles
.
PtBi2 is a new class of triple-degenerate topological semimetal
.
? Topological semi-metallic materials have unique magnetic transport properties, such as chiral negative magnetoresistance, giant magnetoresistance, and extremely high carrier mobility.
They have important value in the application of low-energy electronic devices in the future, and thus become One of the frontiers and hot research directions of international condensed matter physics research
.
? There are three topological semi-metallic materials discovered in previous experiments, namely Dirac semi-metal, Weyl semi-metal, nodal-line semi-metal, and the quasi-particles contained in the three materials are all It is a fourfold or twofold degenerate fermion, that is, two or four semi-odd spin numbers exist at the same time in the same energy state
.
However, it is only confirmed that there are triple degenerate fermions in tungsten-carbon materials WC and MoP
.
? Researchers prepared high-quality layered PtBi2 single crystal samples with triangular lattice characteristics, and used the water-cooled magnets and hybrid magnets of the steady-state strong magnetic field experimental device to perform detailed characterization studies on their magnetic transport properties, and further used the first The principle method has studied the energy band structure of layered PtBi2
.
The results show that the layered structure of PtBi2 is a new type of triple-degenerate topological semimetal, and has two major characteristics.
One is that the triple-degenerate point of PtBi2 is closer to the Fermi surface than WC and MoP.
Corresponding to the characteristics of novel fermions
.
The second is that the layered PtBi2 is easy to cleavage and has natural advantages in the preparation of devices, which has important application potential for the preparation of small-sized micro-nano devices and performance control
.
? This research work is of great significance to promote people's understanding of electronic topological states, discover novel physical phenomena, develop new electronic devices, and deeply understand the properties of elementary particles
.
