Interplay of Superconducting Gap and Spin-Orbit Coupling in Rhombohedral Graphite Proximitized by NbSe2
Zoltán Tajkov
IEEE NAP, Sept 14, 2023
Centre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences
This work was supported by the Slovak Academy of Sciences project IMPULZ IM-2021-42
outline of the talk
ABC graphite
The unique properties of ABC-stacked rhombohedral graphite. Flat band emerged from SSH chain like topology, strongly correlated states around the Fermi energy,
nbse2
Single layer superconductor niobium diselenide is an Ising superconductor, has quantum metallic state, and hosts strong enhancement of charge density wave order.
Heterostructure
Combining 2D materials in heterostructures unlocks potent synergies, enhancing their properties and catalyzing scientific and technological breakthroughs.
IEEE NAP, Sept 14, 2023
ABC graphite
E(\mathbf{q}) \propto |\mathbf{q}|^N
SSH chain
Imre Hagymási et al., Sci. Adv.8,eabo6879(2022)
IEEE NAP, Sept 14, 2023
outline of the talk
ABC graphite
The unique properties of ABC-stacked rhombohedral graphite. Flat band emerged from SSH chain like topology, strongly correlated states around the Fermi energy and
nbse2
Single layer superconductor niobium diselenide is an Ising superconductor, has quantum metallic state, and hosts strong enhancement of charge density wave order.
Heterostructure
Combining 2D materials in heterostructures unlocks potent synergies, enhancing their properties and catalyzing scientific and technological breakthroughs.
IEEE NAP, Sept 14, 2023
nbse2
F. Soto et al. / Physica C 460–462 (2007) 789–790
M. R. Sahu et al. Phys. Rev. B 94, 235451 2016
\( T_c \approx 7 K \)
\( 2\Delta \approx 2.7 \, \mathrm{meV} \)
Xi, X., et al. Nature Phys 12, 139–143 (2016).
Ising superconductor
IEEE NAP, Sept 14, 2023
outline of the talk
ABC graphite
The unique properties of ABC-stacked rhombohedral graphite. Flat band emerged from SSH chain like topology, strongly correlated states around the Fermi energy and
nbse2
Single layer superconductor niobium diselenide is an Ising superconductor, has quantum metallic state, and hosts strong enhancement of charge density wave order.
Heterostructure
Combining 2D materials in heterostructures unlocks potent synergies, enhancing their properties and catalyzing scientific and technological breakthroughs.
IEEE NAP, Sept 14, 2023
Heterostructure
26 C
7 Se
7 Nb
7 Se
Rotation angle 13.89°
Missfit is 3%
The unit cell contains
- 14 Se
- 7 Nb
- 26 \(\times\) (number of graphene layers) C
DFT
Fully relaxed geometry
Single points SOC calculation
Geometry
BZ of a regular graphene unit cell
BZ of the investigated unit cell
IEEE NAP, Sept 14, 2023
Heterostructure
1 layer of C
2 layers of C
3 layers of C
4 layers of C
5 layers of C
6 layers of C
Band structures
Heterostructure
1 layer of C
2 layers of C
3 layers of C
4 layers of C
5 layers of C
6 layers of C
Band structures
Heterostructure
1 layer of C
2 layers of C
3 layers of C
4 layers of C
5 layers of C
6 layers of C
Band structures
Heterostructure
1 layer of C
2 layers of C
3 layers of C
4 layers of C
5 layers of C
6 layers of C
Band structures
Heterostructure
1 layer of C
2 layers of C
3 layers of C
4 layers of C
5 layers of C
6 layers of C
Band structures
Heterostructure
1 layer of C
2 layers of C
3 layers of C
4 layers of C
5 layers of C
6 layers of C
Band structures
Heterostructure
1 layer of C
2 layers of C
3 layers of C
4 layers of C
5 layers of C
6 layers of C
Band structures
Heterostructure
Tight binding
FIT
\( \gamma_0 \) is set
Graphite parameters obtained by SIESTA calculations without the NbSe\(_2\) layers
We solely contemplated the contributions of \( p_z\) orbitals.
Heterostructure
Tight binding
FIX
fixed \( \gamma_0 \)
FIT
\( \gamma_0 \) is fix, fit \( \gamma_{1,2,3} \)
Graphite parameters obtained by SIESTA calculations without the NbSe\(_2\) layers
We solely contemplated the contributions of \( p_z\) orbitals.
IEEE NAP, Sept 14, 2023
Heterostructure
Tight binding
\( \gamma_i \) fixed
NbSe\(_2\) influences the on-site terms
Heterostructure
Tight binding
\( \gamma_i \) fixed
NbSe\(_2\) influences the on-site terms
Heterostructure
Tight binding
\( \gamma_i \) fixed
NbSe\(_2\) influences the on-site terms
Heterostructure
Tight binding
\( \gamma_i \) fixed
NbSe\(_2\) influences the on-site terms
\( e^{\left( -\alpha N \right)} \)
$$\alpha=1.001$$
Conclusion and outlook
\( e^{\left( -\alpha N \right)} \)
$$\alpha=1.001$$
The influence wanishes after 6-7 layers
From 3 to 5 layers
the Fermi energy gets populated
Closest
Farthest
3 layers ABC
5 layers ABC
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