T-K Lee (Special Seminar)

Date/Time
Date(s) - Jan 6 2015
1:30 PM - 2:30 PM

Location
Room 335, McCullough Building

Category(ies)


1:30 pm — Tuesday, January 6, 2015

Stanford University / McCullough #335

Host: Prof. Zhi-Xun Shen

 

Dr. Ting-Kuo Lee

Distinguished Research Fellow and Director Institute of Physics, Academia Sinica Taipei, Taiwan

 

GENESIS OF CHARGE ORDERS IN CUPRATES

Charge orders have been discovered in cuprate superconductors with various different patterns. In this talk we will present a theory and calculated results to show that the t-J model, depending on the doped hole density, has a number of low-energy solutions with unidirectional and bidirectional patterns besides the uniform superconducting states and states with long range antiferromagnetic orders. One of the unidirectional or charge-density wave states without spin modulations has the lowest energy up to 19% doping and it carries a large d-form factor for the bond orders.

The presence of d-form factors and its doping dependence agree very well with recent result of scanning tunneling microscope. At low doping in the regime of the presence of antiferromagnetism, our theory predicts a particular dominant bidirectional or checkerboard state with s’- and d-form factors for the bond orders. The genesis of these many kinds of stripes and density waves indicates that superconductivity and charge orders are connate properties of Mott physics in cuprates.