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Location

Disque Hall Room 919

Audience

  • Current Students
  • Faculty
  • Staff

Physics Colloquium: "Frontiers of STM Manipulations: Imaging Atomic Spin to Operating Nanomachines"

Thursday, April 11, 2013

3:30 PM-4:30 PM

Speaker: Dr. Saw Wai Hla, Ohio University and Argonne National Laboratory
 
Dr. Hla’s group combines a variety of scanning tunneling microscope (STM) manipulation schemes with tunneling spectroscopy techniques to image and manipulate atoms and molecules on surfaces. This talk will highlight recent advances achieved by manipulation at atomic and molecular scale. In the spintronic area, he will present imaging and manipulation of atomic spin using a spin-polarized STM tip. In the nanoscale superconductivity area, donor-acceptor type charge transfer based molecular superconducting system will be discussed. Here, the finding of superconductivity in just four pairs of (BETS)2-GaCl4 molecules opens the possibility of investigating superconducting phenomena locally. In the molecular machine area, he will present controlled rotation of a stand-alone multi-component molecular motor operated by injecting tunneling electrons from an STM tip. By selectively exciting different rotator arms of these molecular motors, controlled rotations into both, clockwise and counterclockwise directions have been achieved. These innovative experiments are tailored to address several critical issues covering fundamental understanding as well as demonstration of novel atom/molecule based devices on materials surfaces.

Contact Information

Dr. Goran Karapetrov
(215) 571-4090
goran@drexel.edu