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DTSTART;TZID=America/New_York:20260327T150000
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DTSTAMP:20260629T082850
CREATED:20260323T153845Z
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UID:10007039-1774623600-1774630800@umaine.edu
SUMMARY:Colloquium - Surface-sensitive studies of electronic properties in  2D materials
DESCRIPTION:Two-dimensional (2D) materials provide a unique platform in which structural\,\nelectronic\, and functional properties are governed almost entirely by surface and interfacial\neffects. Thus\, understanding and controlling these properties is essential for their integration into\nfuture electronic and energy-efficient technologies. In this presentation\, representative results\nare obtained by using advanced surface-sensitive experimental approaches that enable the\ninvestigation of 2D materials\, such as graphene\, germanene\, and transition metal\nchalcogenides\, at the atomic scale. Scanning Tunneling Microscopy (STM) is employed to\nprobe and locally manipulate structural and electronic properties with atomic precision\, while\ncomplementary synchrotron-based techniques offer element-specific and surface-resolved\naccess to electronic structure\, chemical states\, and interfacial phenomena. The results\ndemonstrate how lattice registry\, Moir茅 superstructures\, interfacial coupling\, and local structural\ndistortions strongly influence the electronic landscape of 2D systems\, leading to spatial\nmodulations of charge density\, work function\, and local density of states. Local nano-contacts\ncreated by STM further reveal how mechanical deformation and layer decoupling can be used\nto tune charge injection and junction behavior at the nanoscale. By combining photoemission\nspectroscopy\, polarization-dependent x-ray absorption\, electron diffraction\, and first-principles\ncalculations\, our studies separate the roles of structural asymmetry and electronic orbital\ncharacter in driving anisotropic electronic responses and how intrinsic properties can be\ncontrolled. Overall\, these findings highlight the critical role of surfaces\, interfaces\, and local\nstructural effects in shaping the electronic behavior of 2D materials\, offering new pathways for\ntheir controlled manipulation in future nanoscale and quantum technologies.
URL:/calendar/event/colloquium-surface-sensitive-studies-of-electronic-properties-in-2d-materials/
LOCATION:140 Bennett Hall\, 18 Gym Road\, Orono\, ME
CATEGORIES:Lectures & Seminars,Student Activities
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