Vishik Lab: Spectroscopies of Advanced Materials

Department of Physics, University of California Davis

Ultrafast optics experiments on electron-doped cuprates

A paper from my postdoc is out!

http://journals.aps.org/prb/abstract/10.1103/PhysRevB.95.115125

https://arxiv.org/abs/1601.06694

Electron-doped cuprates are the lesser-studied siblings of the hole-doped high temperature superconductors.  Though they share copper-oxygen planes with the hole-doped cuprates, they have a phase diagram similar to other unconventional superconductors (heavy fermions, organics, iron-based) with an antiferromagnetic phase that abuts against or possibly coexists with superconductivity.  In this paper we explored antiferromagnetic correlations in thin films of LCCO, using femtosecond pump-probe spectrocopy.  We were sensitive to antiferromagnetic correlations via this optical technique because they open a spectral gap in the band dispersion, and the dynamics of excitation recombination across this gap can give information about timescales over which antiferromagnetic correlations are static and coupling between electrons and high-frequency boson.

Some lighter reading

Here are a few of my recent general-audience articles in Forbes and HuffPo about condensed matter, physics/science research, and metallic hydrogen

These articles and others are generally posted on my Media and contact page

Announcements about courses

  • There is conflicting information about the time for Physics 140A (Winter 2017).  The correct time is Tuesday/Thursday, 12:10-1:30PM, Physics building, room 140.  A syllubus can be found in the Courses section of this website or on Canvas.
  • My portion of the lecture slides for Physics 250 (Special topics: Spectroscopies of quantum materials) is now posted under Courses.  I hope this can be a useful resource for those of you interested in ARPES, time-domain spectroscopeis, and applications of these tools for learning about a variety of quantum materials!

Welcome to my website!

I am excited to start as an assistant professor in the physics department at the University of California Davis, and I am building a lab focused on the growth and study of novel quantum materials, particularly unconventional and high temperature superconductors, correlated electron systems, topological materials, and energy materials.  This lab will use both angle-resolved photoemission spectroscopy (ARPES) and time resolved techniques for elucidating the electronic structure and dynamics of quantum materials such as unconventional superconductors, materials with topological surface state, and 2D materials.   These advanced materials hold promise for revealing new emergent phenomena, elucidating interactions in many body systems, and enabling tomorrow’s electronics and energy resources.