Research interest

My research interest is to explore the quantum phenomena at an extremely low temperature. Many methods exist to achieve this goal like STM(scanning tunneling microscope), Magneto-optical Kerr effect (MOKE) microscopy, SET(single electron transistor), and so on. These methods have common property. They have measured an extremely low physical value like the change of the magnetic field or electrical property according to experimental conditions. Among them, I'm interested to measure the magnetic property with the optical method.

The Torque-Magnetometry method is an optical method that has very high sensitivity. The SQUID(superconducting quantum interface device) and The Torque-Magnetometry method are the most famous method to measure the magnetic moment of samples with very high sensitivity. The sensitivity of the Torque-magnetometry method is 5 orders hight than the SQUID method. This method even can measure the changing of the single spin. This method can measure the magnetic property of the various superconducting material without damage to the sample.

My research is to explore the type 2 superconductor by using the Torque-Magnetometry method. The type 2 superconductor has the vortex property. So the magnetic moment of this sample changes with the external magnetic field. I measure this property with very high resolution. The resolution of our method is about 10^-11emu/sqrt(Hz) now. Also I'm interested in Transom qubit which is using the SQUID component.