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Departmental Colloquium

Title
Kondo Phenomenon at Steady-State Nonequilibrium  
Guest Speaker
Dr. Hong  
Guest Affiliation
POSTECH & Asia Pacific Center for Theoretical Physics, Korea  
Host
Howard Lee  
When
Thursday, October 10, 2013 4:00 pm - 5:00 pm  
Location
Physics Auditorium (Rm 202)  
Details

Nonequilibrium Kondo problem is one of long standing problems in condensed matter physics. For this reason, all of the experimental observations for the tunneling conductance of various Kondo-involved mesoscopic systems are not properly explained. In this colloquium, I will introduce basic Kondo physics in equilibrium and extend the discussion to steady-state nonequilibrium in which entangled Kondo singlets perform coherent tunneling depending on the amount of bias. Then, I clarify that the Kondo phenomenon at steady-state nonequilibrium is the side peaks appearing in dI/dV vs. V curve, and I reproduce the dI/dV line shapes of various mesoscopic Kondo systems such as quantum dot single-electron transistor, quantum point contact, and adsorbed magnetized atom on a metallic substrate. I will show that multilayer graphene and high-Tc superconductor can be treated in the same category. I will introduce the theoretical method to obtain the on-site Green’s function for the two-reservoir Anderson impurity model under bias, which gives the tunneling conductance mentioned above.

 

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