Topological phase diagram of BiTeX/graphene hybrid systems
Institute of physics, Eötvös Loránd University, Budapest
László Oroszlány, Zoltán Tajkov,
János Koltai, Gergő Kukucska
Outline
-
BiTeX layer -
BiTeX /graphene -
Topological phase diagram of
single sided
Graphene is...
...a good template
BiTeX: giant SOC semiconductors
Ishizaka et al. Nature Materials 10, 521 (2011)
BiTeX monolayers recently fabricated!
Fülöp et al. 2D Mater. 5 (2018) 031013
BiTeX/graphene heterostructures
BiTeI sandwich: Kou et al. ACS Nano, 8 10448 (2014)
trivial
topological
Effective model and fit
t_1+i\vec{m_1}\cdot\vec{\sigma}
t_2+i\vec{m_2}\cdot\vec{\sigma}
t_3+i\vec{m_3}\cdot\vec{\sigma}
im_z\sigma_z
- moderate energy structure ~ \(t_i\) and \(m_z\)
- low energy \(\vec{m_i}\)
=\mathrm{e}^{-\beta\left(l/l_0-1\right)}
Pressure→I, Strain →TI !?!
topological
trivial
Strain kills Kekule!
Kekule
Kane-Mele
Coupling Dirac cones
in different valleys
Intra valley effect stronger
The Team
Zoltán Tajkov János Koltai Dávid Visontai Gegő Kukucska
Bálint Fülöp Szabolcs Csonka Péter Makk Sándor Bordács
Thanks!
2017-1.2.1-NKP-2017-00001
FK124723
1783-3/2018/FEKUTSRAT
iSpinText
Topological phase diagram of BiTeX/graphene hybrid systems
By László Oroszlány
