Quantum capacitance anomalies of two-dimensional non-equilibrium states under microwave irradiation

Event Details
  • Date/Time:
    • Thursday March 9, 2017
      3:00 pm - 4:00 pm
  • Location: Howey Physics Bldg. Rm. N110
  • Phone: 404-894-8886
  • URL:
  • Email:
  • Fee(s):
    Free
  • Extras:
Contact

amorain@gatech.edu

Summaries

Summary Sentence: Quantum capacitance anomalies of two-dimensional non-equilibrium states under microwave irradiation

Full Summary: No summary paragraph submitted.

School of Physics Hard Condensed Matter Seminar: Prof. Chi Zhang, ICQM, Peking University

We report our direct study of the compressibility on ultrahigh mobility two-dimensional electron system (μ ~ 1×10cm2/Vs) in GaAs/AlGaAs quantum wells under microwave (MW) irradiation. The field penetration current results show that the quantum capacitance oscillates with microwave induced resistance oscillations (MIRO), however, the trend is opposite with respect to the compressibility for usual equilibrium states in previous theoretical explanations.

The anomalous phenomena provide a platform for study on the non-equilibrium system under microwave, and point to the current domains and inhomogeneity induced by radiation. Moreover, the quantum capacitance indication for multi-photon process around j = 1/2 is detected under intensive microwave below 30 GHz.

Additional Information

In Campus Calendar
Yes
Groups

School of Physics, College of Sciences

Invited Audience
Faculty/Staff, Undergraduate students, Graduate students
Categories
Seminar/Lecture/Colloquium
Keywords
physics
Status
  • Created By: Alison Morain
  • Workflow Status: Published
  • Created On: Feb 27, 2017 - 12:05pm
  • Last Updated: Apr 13, 2017 - 5:12pm