Semimetal compound of Pt

A semimetal compound of Pt, wherein the semimetal compound of Pt is single crystal PtSe2, and the single crystal PtSe2 is type-II Dirac semimetals;

• wherein the semimetal compound of Pt is prepared by:
• placing a PtSe2 polycrystalline material and a chemical transport medium in a reacting chamber;
• evacuating the reacting chamber to be vacuum with a pressure lower than 10 Pa;
• placing the reacting chamber at a temperature gradient, wherein the reacting chamber has a first end subjected to a first temperature of about 1200 degrees Celsius to about 1000 degrees Celsius and a second end opposite to the first end and subjected to a second temperature of about 1000 degrees Celsius to about 900 degrees Celsius, and the PtSe2 polycrystalline material is placed in the first end;
• and
• keeping the reacting chamber in the temperature gradient for 10 days to 30 days.