Topological phase diagram of BiTeX-graphene hybrids
\( (d \circ f)\varphi \), Balatonfenyves, 2019
Zoltán Tajkov, PhD Student
ELTE, BFT
\( (d \circ f)\varphi \), Balatonfenyves, 2019
WHY SO TOPOLOGICAL?
- Dissipationless transistor
- Quantum Computation
- Majorana fermions
- Optoelectronics
\( (d \circ f)\varphi \), Balatonfenyves, 2019
GRAPHENE IS GOOD...
... as a base
\( (d \circ f)\varphi \), Balatonfenyves, 2019
ABOUT GRAPHENE
and its friends
\( (d \circ f)\varphi \), Balatonfenyves, 2019
HOW TO MAKE GRAPHENE TOPOLOGICAL?
\mathcal{H}=\sum_{ij\alpha}t c^\dagger_{i\alpha}c_{j\alpha} \sigma_0
\( (d \circ f)\varphi \), Balatonfenyves, 2019
HOW TO MAKE GRAPHENE TOPOLOGICAL?
\mathcal{H}=\sum_{ij\alpha}t c^\dagger_{i\alpha}c_{j\alpha} \sigma_0+\sum_{ij\alpha\beta}it'c^\dagger_{i\alpha}c_{j\beta}\sigma_z
\( (d \circ f)\varphi \), Balatonfenyves, 2019
HOW TO MAKE GRAPHENE TOPOLOGICAL?
K
\( E_F \)
t'=0
\( E_F \)
t'\neq 0
TOPOLOGICAL
turn on SOC
K
\( (d \circ f)\varphi \), Balatonfenyves, 2019
CHANGING THE PROPERTIES OF GRAPHENE
- Adatoms
- Strain
- Curvature
- Composite
\( (d \circ f)\varphi \), Balatonfenyves, 2019
HOW TO MAKE GRAPHENE TOPOLOGICAL?
Weak inherent SOC...
Buff it!
\( (d \circ f)\varphi \), Balatonfenyves, 2019
HOW TO MAKE GRAPHENE TOPOLOGICAL?
\( (d \circ f)\varphi \), Balatonfenyves, 2019
HOW TO MAKE GRAPHENE TOPOLOGICAL?
K \( \leftarrow \) \( \Gamma \) \( \rightarrow \) M
\( E_F \)
REMAINS METALLIC
\( (d \circ f)\varphi \), Balatonfenyves, 2019
HOW TO MAKE GRAPHENE TOPOLOGICAL?
Pressure!
\( (d \circ f)\varphi \), Balatonfenyves, 2019
HOW TO MAKE GRAPHENE TOPOLOGICAL?
Pressure!
Pressure opens gap!
... but it's trivial...
\( (d \circ f)\varphi \), Balatonfenyves, 2019
HOW TO MAKE GRAPHENE TOPOLOGICAL?
Strain?!
\( (d \circ f)\varphi \), Balatonfenyves, 2019
HOW TO MAKE GRAPHENE TOPOLOGICAL?
\( (d \circ f)\varphi \), Balatonfenyves, 2019
CAN WE UNDERSTAND IT?
\( (d \circ f)\varphi \), Balatonfenyves, 2019
THANK YOU FOR YOUR ATTENTION!
László Oroszlány János Koltai Dávid Visontai Gergő Kukucska
Bálint Fülöp Szabolcs Csonka Péter Makk Sándor Bordács
THE TEAM
Topological phase diagram of BiTeX-graphene hybrids
By novidad21
