Carrier behavior of HgTe under high pressure revealed by Hall effect measurement

Carrier behavior of HgTe under high pressure

revealed by Hall effect measurement

胡廷静;崔晓岩;李雪飞;王婧姝;吕秀梅;王棱升;杨景海;高春晓

【期刊名称】《中国物理：英文版》 【年(卷),期】2015(000)011

【摘要】We investigate the carrier behavior of HgTe under high pressures up to 23 GPa using in situ Hall effect measurements. As the phase transitions from zinc blende to cinnabar, then to rock salt, and finally to Cmcm occur, all the parameters change discontinuously. The conductivity variation under compression is described by the carrier parameters. For the zinc blende phase, both the decrease of carrier concentration and the increase of mobility indicate the overlapped valence band and conduction band separates with pressure. Pressure causes an increase in the hole concentration of HgTe in the cinnabar phase, which leads to the carrier-type inversion and the lowest mobility at 5.6 GPa. In the phase transition process from zinc blende to rock salt, Te atoms are the major ones in atomic movements in the pressure regions of 1.0–1.5 GPa and 1.8–3.1 GPa, whereas Hg atoms are the major ones in the pressure regions of 1.5–1.8 GPa and 3.1–7.7 GPa. The polar optical scattering of the rock salt phase decreases with pressure. 【总页数】4页(1-4) 【关键词】