学术报告（4月19日）

主持人：钟定永 教授

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摘要：We demonstrate that molecular and supramolecular structures assembled on metal surface provide an effective means to control and manipulate two-dimensional electron gas (2DEG). The first example is to use a cryogenic scanning tunneling microscope to arrange coronene molecules one by one into a triangular lattice on a Cu(111) surface.As revealed by tunneling spectroscopy, the band structure and density of states of the 2DEG exhibit hallmark signatures of massless Dirac fermions. We then manipulated the quasi-particle spectra with aperiodically-arranged molecules, including zigzag and arm-chair edge nanoribbons, single vacancies, Stone-Wales defects and grain boundary dislocation lines. We detected enhanced density of states at or close to the Dirac point. In particular, we resolved edge states in the zigzag nanoribbons. The second example is to use supramolecular self-assembly on a Cu(111) surface to modulate 2DEG band structures.The characteristics of the bands are tuned though changing the periodicity of the supramolecular networks and the molecule-to-surface interaction. In the last, we present a proposal for engineering topological superconductors using this technique, which aims at probing Majorana fermions

报告人简介：

LIN, Nian

Department of Physics

The Hong Kong University of Science and Technology

CV

BSc (07/1991), Tongji University, Shanghai, China

PhD (11/1997), The Hong Kong University of Science and Technology

Postdoctoral researcher (11/1997-10/1999), Linkoping University, Sweden

Research group leader (11/1999-07/2007), molecular nanostructures group, Nanoscale Science Department, Max-Planck-Institute for Solid State Research, Stuttgart, Germany

Associate Professor (08/2007-06/2014), Physics Department of HKUST

Professor (2014-), Physics Department of HKUST

PRESENT RESEARCH WORK

Develop supramolecular self-assembly and on-surface synthesis to fabricate low-dimensional molecular nanostructures.

Investigate electronic structures of low-dimensional molecular systems.

Characterize charge transport and energy transfer at single molecules by means of low-temperature STM/STS.

PUBLICATION RECORD

110 journal papers, 2 editorials and 2 book chapters, over 4000 citations, h index=36