Tuning ferromagnetic BaFe$_2$(PO$_4$)$_2$ through a high Chern number topological phase
In: Phys. Rev. B 94, 125134 (2016); (2016)
Online
report
There is strong interest in discovering or designing wide gap Chern insulators. Here we follow a Chern insulator to trivial Mott insulator transition versus interaction strength U in a honeycomb lattice Fe-based transition metal oxide, discovering that a spin-orbit coupling energy scale $\xi$=40 meV can produce and maintain a topologically entangled Chern insulating state against large band structure changes arising from an interaction strength U up to 60 times as large. Within the Chern phase the minimum gap switches from the zone corner K to the zone center $\Gamma$ while maintaining the topological structure. At a critical strength $U_c$, the continuous evolution of the electronic structure encounters a gap closing then reopening, upon which the system reverts to a trivial Mott insulating phase. This Chern insulator phase of honeycomb lattice Fe$^{2+}$ BaFe$_2$(PO$_4$)$_2$ corresponds to a large Chern number C=-3 that will provide enhanced anomalous Hall conductivity due to the associated three edge states threading through the bulk gap of 80 meV.
Comment: 8 pages, 7 figures
Titel: |
Tuning ferromagnetic BaFe$_2$(PO$_4$)$_2$ through a high Chern number topological phase
|
---|---|
Autor/in / Beteiligte Person: | Song, Young-Joon ; Ahn, Kyo-Hoon ; Pickett, W. E. ; Lee, K. W. |
Link: | |
Quelle: | Phys. Rev. B 94, 125134 (2016); (2016) |
Veröffentlichung: | 2016 |
Medientyp: | report |
DOI: | 10.1103/PhysRevB.94.125134 |
Schlagwort: |
|
Sonstiges: |
|