THz Time-domain Spectroscopy: Unlocking New Materials Physics in Novel Condensed Matter Systems

IQSE AMO QO Seminar Series

Pizza will be served for IQSE members at 11:00 am. The talk will start around 11:30 am.

Speaker: Dr. David J. Hilton

Venue: IQSE SEMINAR ROOM (MPHY 578)

ABOUT THE SPEAKER: Dr. Hilton’s research program focuses on the study of insulator-to-metal phase transitions in transition metal oxides and ultrafast investigations of high mobility 2DEGs and dichalcogenides. Primary research tools are ultrafast laser systems, nonlinear optical systems, and high magnetic field spectroscopy, both at Baylor as well as in collaboration with the National High Magnetic Field Laboratory in Tallahassee, FL.

EVENT DETAILS: Terahertz time-domain spectroscopy is it powerful optical technique that can measure low energy excitations and condensed matter materials on the sub-picosecond time scale. In this talk, I will discuss two recent experiments using terahertz time-domain spectroscopy to demonstrate. In the first part of my talk, I will discuss recent experiments to develop near and middle infrared electronic materials for next generation communications platforms. In current wireless technology, silicon and silicon -germanium are commonly-used semiconductors as emitters in wireless communications.  As bandwidth requirements continue to increase from gigahertz into the lower terahertz band, novel electronic materials will be required as next generation materials.  Our experiments examine one such material, bismuth doped gallium arsenide, and its suitability for future electronics applications. In the second part of my talk, I will discuss our recent experiments using strain to suppress superconductivity simple class of iron-based superconductors.  FeSe is the prototype “11” iron-based superconductor with the transition temperature in the bulk of 8 to 10 Kelvin.  We demonstrate in strained FeSe samples via growth on a lattice mismatched super rate, the suppression of the superconducting dome with a T_C < 2 K.  In the final part of my talk, I will discuss our future planes experiments with this material system to study the ground state in Fe_1-xCu_xSe near its quantum critical point (xc =1.5%), which should permit us to dynamically characterize this Quantum phase transition.

ZOOM information:

https://tamu.zoom.us/j/98156251523?pwd=QVdSdGxtL1UyY0g1L083SU5QR0QrUT09

Meeting ID: 981 5625 1523
Passcode: 297578

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