Growth and electronic properties of bi- And trilayer graphene on Ir(111)

TY - JOUR

T1 - Growth and electronic properties of bi- And trilayer graphene on Ir(111)

AU - Kastorp, Claus F.P.

AU - Duncan, David A.

AU - Scheffler, Martha

AU - Thrower, John D.

AU - Jørgensen, Anders L.

AU - Hussain, Hadeel

AU - Lee, Tien Lin

AU - Hornekær, Liv

AU - Balog, Richard

PY - 2020/10

Y1 - 2020/10

N2 - Interesting electronic properties arise in vertically stacked graphene sheets, some of which can be controlled by mutual orientation of the adjacent layers. In this study, we investigate the MBE grown multilayer graphene on Ir(111) by means of STM, LEED and XPS and we examine the influence of the substrate on the geometric and electronic properties of bilayer graphene by employing XSW and ARPES measurements. We find that the MBE method does not limit the growth to two graphene layers and that the wrinkles, which arise through extended carbon deposition, play a crucial role in the multilayer growth. We also find that the bilayer and trilayer graphene sheets have graphitic-like properties in terms of the separation between the two layers and their stacking. The presence of the iridium substrate imposes a periodic potential induced by the moiré pattern that was found to lead to the formation of replica bands and minigaps in bilayer graphene. From tight-binding fits to our ARPES data we find that band renormalization takes place in multilayer graphene due to a weaker coupling of the upper-most graphene layer to the iridium substrate.

AB - Interesting electronic properties arise in vertically stacked graphene sheets, some of which can be controlled by mutual orientation of the adjacent layers. In this study, we investigate the MBE grown multilayer graphene on Ir(111) by means of STM, LEED and XPS and we examine the influence of the substrate on the geometric and electronic properties of bilayer graphene by employing XSW and ARPES measurements. We find that the MBE method does not limit the growth to two graphene layers and that the wrinkles, which arise through extended carbon deposition, play a crucial role in the multilayer growth. We also find that the bilayer and trilayer graphene sheets have graphitic-like properties in terms of the separation between the two layers and their stacking. The presence of the iridium substrate imposes a periodic potential induced by the moiré pattern that was found to lead to the formation of replica bands and minigaps in bilayer graphene. From tight-binding fits to our ARPES data we find that band renormalization takes place in multilayer graphene due to a weaker coupling of the upper-most graphene layer to the iridium substrate.

UR - http://www.scopus.com/inward/record.url?scp=85092727767&partnerID=8YFLogxK

U2 - 10.1039/d0nr04788k

DO - 10.1039/d0nr04788k

M3 - Journal article

C2 - 32966486

AN - SCOPUS:85092727767

SN - 2040-3364

VL - 12

SP - 19776

EP - 19786

JO - Nanoscale

JF - Nanoscale

IS - 38

ER -