The appearance of topologically protected states at the surface of an ordinary insulator is a rare occurrence and to date only a handful of materials are known for having this property. An intriguing question concerns the possibility of forming topologically protected interfaces between different materials. Here we propose that a topological phase can be transferred to graphene by proximity with the three-dimensional topological insulator Bi2Se3. By using density functional and transport theory, we prove that, at the verge of the chemical bond formation, a hybrid state forms at the graphene/Bi2Se3 interface. The state has Dirac-cone-like dispersion at the Gamma point and a well defined helical spin texture, indicating its topologically protected nature. This demonstrates that proximity can transfer the topological phase from Bi2Se3 to graphene.
Source:
Physical Review B, 2014, 90, 3
Publisher:
Amer Physical Soc, College Pk
Funding / projects:
Science Foundation of Ireland (SFI)Science Foundation Ireland [07/IN.1/I945]
Irish Research CouncilIrish Research Council for Science, Engineering and Technology
TY - JOUR
AU - Popov, Igor
AU - Mantega, Mauro
AU - Narayan, Awadhesh
AU - Sanvito, Stefano
PY - 2014
UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/775
AB - The appearance of topologically protected states at the surface of an ordinary insulator is a rare occurrence and to date only a handful of materials are known for having this property. An intriguing question concerns the possibility of forming topologically protected interfaces between different materials. Here we propose that a topological phase can be transferred to graphene by proximity with the three-dimensional topological insulator Bi2Se3. By using density functional and transport theory, we prove that, at the verge of the chemical bond formation, a hybrid state forms at the graphene/Bi2Se3 interface. The state has Dirac-cone-like dispersion at the Gamma point and a well defined helical spin texture, indicating its topologically protected nature. This demonstrates that proximity can transfer the topological phase from Bi2Se3 to graphene.
PB - Amer Physical Soc, College Pk
T2 - Physical Review B
T1 - Proximity-induced topological state in graphene
IS - 3
VL - 90
DO - 10.1103/PhysRevB.90.035418
ER -
@article{
author = "Popov, Igor and Mantega, Mauro and Narayan, Awadhesh and Sanvito, Stefano",
year = "2014",
abstract = "The appearance of topologically protected states at the surface of an ordinary insulator is a rare occurrence and to date only a handful of materials are known for having this property. An intriguing question concerns the possibility of forming topologically protected interfaces between different materials. Here we propose that a topological phase can be transferred to graphene by proximity with the three-dimensional topological insulator Bi2Se3. By using density functional and transport theory, we prove that, at the verge of the chemical bond formation, a hybrid state forms at the graphene/Bi2Se3 interface. The state has Dirac-cone-like dispersion at the Gamma point and a well defined helical spin texture, indicating its topologically protected nature. This demonstrates that proximity can transfer the topological phase from Bi2Se3 to graphene.",
publisher = "Amer Physical Soc, College Pk",
journal = "Physical Review B",
title = "Proximity-induced topological state in graphene",
number = "3",
volume = "90",
doi = "10.1103/PhysRevB.90.035418"
}
Popov, I., Mantega, M., Narayan, A.,& Sanvito, S.. (2014). Proximity-induced topological state in graphene. in Physical Review B
Amer Physical Soc, College Pk., 90(3).
https://doi.org/10.1103/PhysRevB.90.035418
Popov I, Mantega M, Narayan A, Sanvito S. Proximity-induced topological state in graphene. in Physical Review B. 2014;90(3).
doi:10.1103/PhysRevB.90.035418 .
Popov, Igor, Mantega, Mauro, Narayan, Awadhesh, Sanvito, Stefano, "Proximity-induced topological state in graphene" in Physical Review B, 90, no. 3 (2014),
https://doi.org/10.1103/PhysRevB.90.035418 . .
