The big picture goal of this group is to investigate the nonlinear properties of condensed materials, mainly focusing on low-dimensional systems: quantum dots, quantum wells and thin films. One of the main developments of Sergey Vitkalov and his collaborators is the concept of quantal heating of the electrons in a two-dimensional electron gas, though the phenomenon will occur in any system with a quantized energy spectrum. This effect stands distinctly apart from traditional Joule heating and is absent in classical systems. Quantal heating produces a peculiar spectral distribution of electrons (a partially-flattened step-like distribution) that depends on the occupation of quantized energy states and deviates signiﬁcantly from the Fermi-Dirac form.
|February 20th, 2015|
We are proud to announce our latest publication in the APS Physical Review B Rapid Communication in collaboration with SUNY Buffalo and Brookhaven National Laboratory.
Frequency dispersion of nonlinear response of thin superconducting films in the Berezinskii-Kosterlitz-Thouless state
Scott Dietrich, William Mayer, Sean Byrnes, Sergey Vitkalov, A. Sergeev, Anthony T. Bollinger, and Ivan Božović
Phys. Rev. B 91, 060506(R)
|February 19th, 2015|
The ASRC will open its doors to the nanoscience community in the New York City metro area to host this free one-day symposium, Nanoscience NY.
Graduate students from the CCNY Microwave Lab will be presenting posters of their research, helping to open up the brand new CUNY Advanced Science Research Center and CCNY Science Facilities.
Graduate students from the microwave lab will be giving the following talks at the upcoming APS March Meeting in San Antonio, TX:
Scott Dietrich (PhD student) gave an invited talk entitled "Probing the Electron Dynamics Behind Quantal Heating of 2D Electrons" at the Physics Department of Clark University in Worcester, MA on December 10th.
Scott also was awarded the FGSA Travel Award for Excellence in Graduate Research in order to attend the APS March Meeting. The award comes from the Forum on Graduate Student Affairs, a division of APS dedicated to the professional development of graduate students in the field of physics.
Here is an advanced e-print of our latest publication:
Dynamics of Quantal Heating in Electron Systems with Discrete Spectra
Scott Dietrich, William Mayer, Sergey Vitkalov, and A. A. Bykov
Available at arXiv.org.
| March, 2014|
Two PhD students from our group contributed three talks and one poster to the APS March Meeting in Denver, CO.
"Frequency dispersion of nonlinear response of thin superconducting films"
- Scott Dietrich (Talk)
"Nonlinear magneto-transport in two dimensional electron system with anisotropic mobility"
- William Mayer (Talk)
"I-V characteristics of atomically thin superconducting La2−xSrxCuO films"
- Scott Dietrich (Talk)
"Bolometric calibration of microwave power in low temperature systems" (Poster)