THE  COLLEGE  OF  SCIENCE,  ZHEJIANG  UNIVERSITY
PHYSICS  COLLOQUIUM

物理学术前沿讲座
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Reconstruction of Fractional Quantum Hall Edges  
by
Prof. Dr.  Kun Yang 
National High Magnetic Field Lab, USA  

  2002年6月7日 星期五16:15-17:15

浙江近代物理中心 报告厅 #203

(light refreshments will be served prior to the colloquium)


欢迎感兴趣的教师、研究生及高年级本科生参加  
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ABSTRACT 

      In this talk we discuss our recent work on the interplay of electron-electron interaction, confining potential, and effects of finite temperature at the edge of a quantum Hall liquid. Our exact diagonalization calculations indicate that edge reconstruction occurs in the fractional quantum Hall regime for a variety of confining potential, including ones that correspond to a "sharp" edge. The electron density profile of the reconstructed edge depends sensitively on the details of the confining potential. We also propose a modification to the chiral Luttinger liquid theory to accommodate the possibility of edge reconstruction, which also allows us to obtain the exact critical behavior of the reconstruction transition. To study the effects of finite temperature on edge reconstructions, we have performed Hartree-Fock calculation for reconstructed integer quantum Hall edges, and thermal averaging of all eigen-states for fractional edges with small sizes. We find the reconstruction is suppressed by thermal fluctuations above certain characteristic temperature. We discuss the implication of our results on recent edge tunneling and microwave absorption experiments.