TY - JOUR
T1 - Characterization and Manipulation of Intervalley Scattering Induced by an Individual Monovacancy in Graphene
AU - Zhang, Yu
AU - Gao, Fei
AU - Gao, Shiwu
AU - Brandbyge, Mads
AU - He, Lin
N1 - Publisher Copyright:
© 2022 American Physical Society.
PY - 2022/8/26
Y1 - 2022/8/26
N2 - Intervalley scattering involves microscopic processes that electrons are scattered by atomic-scale defects on the nanoscale. Although central to our understanding of electronic properties of materials, direct characterization and manipulation of range and strength of the intervalley scattering induced by an individual atomic defect have so far been elusive. Using scanning tunneling microscope, we visualize and control intervalley scattering from an individual monovacancy in graphene. By directly imaging the affected range of monovacancy-induced intervalley scattering, we demonstrate that it is inversely proportional to the energy; i.e., it is proportional to the wavelength of massless Dirac fermions. A giant electron-hole asymmetry of the intervalley scattering is observed because the monovacancy is charged. By further charging the monovacancy, the bended electronic potential around the monovacancy softens the scattering potential, which, consequently, suppresses the intervalley scattering of the monovacancy.
AB - Intervalley scattering involves microscopic processes that electrons are scattered by atomic-scale defects on the nanoscale. Although central to our understanding of electronic properties of materials, direct characterization and manipulation of range and strength of the intervalley scattering induced by an individual atomic defect have so far been elusive. Using scanning tunneling microscope, we visualize and control intervalley scattering from an individual monovacancy in graphene. By directly imaging the affected range of monovacancy-induced intervalley scattering, we demonstrate that it is inversely proportional to the energy; i.e., it is proportional to the wavelength of massless Dirac fermions. A giant electron-hole asymmetry of the intervalley scattering is observed because the monovacancy is charged. By further charging the monovacancy, the bended electronic potential around the monovacancy softens the scattering potential, which, consequently, suppresses the intervalley scattering of the monovacancy.
UR - http://www.scopus.com/inward/record.url?scp=85136133132&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.129.096402
DO - 10.1103/PhysRevLett.129.096402
M3 - Article
C2 - 36083638
AN - SCOPUS:85136133132
SN - 0031-9007
VL - 129
JO - Physical Review Letters
JF - Physical Review Letters
IS - 9
M1 - 096402
ER -