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QUANTUM CORRAL

 

 

 

 

Figure 1.  A closer look of Scanning Tunneling Microscopy (STM) image of quantum corral (2)

 

 

 

Quantum Corral is a ring of 48 iron atoms on a copper (111) surface.  The iron atoms confine some of the copper's surface electrons, making them into quantum states visible as circular rings (or standing-wave patterns defined by 2-D Schrödinger wave equation) inside the corral.  The 48 iron atoms, adsorbed on the copper (111) surface, were moved into position with the tip of a low temperature scanning tunneling microscope (STM), to make a corral ring with a radius of 71.3 Angstroms.  The corral ring resembles as a barrier that forced surface state electrons into quantum states seen in Figure 1 as circular rings of electron density in the interior of corral ring.  The ripples in the corral ring represent the density distribution of a particular set of quantum states of copper's surface electrons.  The quantum corral also represents the popular classic eigenvalue problem in quantum mechanics, known as a particle in a squared well box model.  The image is also obtained by using STM.  Colors were added artificially (1, 2).  The quantum corral also verifies the existence of electrons and resembles a 2-D infinite well.

 

 

 

Figure 2.  The STM image that shows the various stages during the construction of the circular corral (2)

 

 

Figure 3.  A quantum corral (colors are added artificially) (3)

 

 

 

 

References:

1.  http://web.mit.edu/i-m/image11big.htm

2.  http://www.almaden.ibm.com/vis/stm/corral.html

3.  http://www.nanoscience.com/education/STM.html