Tuning Valley Degeneracy with Band Inversion
2021
Valley degeneracy is a key feature of the electronic structure that benefits the thermoelectric performance
of a material. Despite recent studies which claim that high valley degeneracy can be achieved
with inverted bands, our survey of rock-salt IV-VI compounds demonstrates that mere band inversion
is an insufficient condition for high valley degeneracy; rather, there is a critical degree to which the
bands must be inverted to induce multiple carrier pockets. The so-called “band inversion parameter”
is a chemically-tunable parameter, offering a design route to achieving high valley degeneracy in compounds
with inverted bands. We predict that the valley degeneracy of rock-salt IV-VI compounds can be
increased from NV = 4 to NV = 24, which could result in a corresponding increase in the thermoelectric
figure of merit zT.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
1
References
0
Citations
NaN
KQI