Physics & Astronomy Colloquium - Chih-Chun Chien, Univ. of California, Merced

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Physics & Astronomy Colloquium - Chih-Chun Chien, Univ. of California, Merced

Title: "Quantum Transport in Ultracold Atoms"

Friday, April 13, 2018
Wilder 104
Intended Audience(s): Public
Categories: Lectures & Seminars

Abstract: Recent advance in cooling and trapping atoms has brought exciting quantum phenomena, including atomic Bose-Einstein condensate (BEC), superfluid, Mott insulator, and topological phases. One realistic yet ambitious goal is to use cold-atoms and optical potentials to simulate and complement electronic devices, and this leads to a thriving field called atomtronics. In contrast to electronic systems, cold-atoms are charge neutral and isolated from their environment. Moreover, strong quantum effects drastically alter transport properties of cold-atoms. I will first review breakthroughs in the study of quantum transport using various cold-atom systems and contrast theoretical descriptions in open- and closed- system approaches. Naïve applications of transport theories of electronic systems to cold atoms may lead to incorrect interpretations. To demonstrate similarities of physics across various fields, I will discuss the phenomenon of negative differential conductance, which has been studied in plasma and solid-state systems. By tuning the interaction and chemical potential of cold-atoms, negative differential conductance can also appear in quantum transport of cold-atoms.

Short bio of the speaker: Chih-Chun Chien got his PhD from the University of Chicago in 2009. He moved to Los Alamos National Laboratory, first as a director funded fellow and then an Oppenheimer fellow. He is currently a physics assistant professor at University of California, Merced, working on theoretical atomic and molecular physics. His research covers ultracold atoms, superfluids and superconductors, quantum and thermal transport, and mathematical physics.

For more information, contact:
Tressena Manning

Events are free and open to the public unless otherwise noted.