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. 


Recent News: 

     August 25th, 2016   

                                                       Publication of our manuscript in JETP Letters. 
 
                                                       Zero differential resistance state of two dimensional electron gas in one dimensional periodic potential at high                                                           filling factors                                                                                                                                                                                                      A. A. Bykov, I. S. Strygin, A. V. Goran, E. E. Rodyakina,  W. Mayer and S. A. Vitkalov                                                                                         Pisma v ZhETF, 104, 258 (2016) (in Russian)



 
     June 28th, 2016
      
     Publication of our manuscript in the APS Physical Review B.                                                      

                                                          

                                                          Resistance oscillations of two-dimensional electrons in crossed electric and tilted magnetic fields
                                                          W. Mayer, S. Vitkalov and A. A. Bykov
                                                           Phys. Rev. B 93, 245436



     March 17th, 2016

     William Mayer(PhD Student) from the microwave lab will give the following talk at the 2016 APS                   March Meeting in Baltimore, MD:

     Magneto-inter-subband oscillations in GaAs quantum wells with three populated subbands                 placed in tilted magnetic fields
                                                          William Mayer: Thursday. March 17th, 11:15am
                                                          Session S51: Thermodynamic & Transport Properties in Semiconductors


 
     March 14th, 2016
      
     Publication of our manuscript in the APS Physical Review B.                                                      

                                                          
                                                          Magnetointersubband resistance oscillations in GaAs quantum wells placed in a tilted magnetic                                                                  field
                                                          William Mayer, Jesse Kanter, Javad Shabani, Sergey Vitkalov, A. K. Bakarov, and A. A. Bykov
                                                           Phys. Rev. B 93, 115309

   
                                                     

 October 8th, 2015

Publication of our manuscript in the APS Physical Review B.

Quantum electron lifetime in GaAs quantum wells with three populated subbands
 Scott Dietrich, Jesse Kanter, W. Mayer, Sergey Vitkalov, D. V. Dmitriev and A. A. Bykov
 Phys. Rev. B 92. 155411

 July 10th, 2015

William Mayer (PhD student) will be presenting a poster at the upcoming 11th International Conference on Materials and Mechanisms of Superconductivity to be held in Geneva, Switzerland from August 23-28, 2015. 

Poster Title: Frequency dispersion of nonlinear response of thin superconducting films

  
 June 26th, 2015

The CCNY Microwave Lab has officially moved into the brand new City College Center for Discovery and Innovation located adjacent to the CUNY Advanced Science and Research Center (ASRC). We can now be found at the address listed below.

CCNY Microwave Laboratory
85 St. Nicholas Terrace Room 1251
New York, NY 10027

  
 May 28th, 2015

We proudly to announce the publication of another manuscript in the APS Physical Review B.

Dynamics of quantal heating in electron systems with discrete spectra
Scott Dietrich, William Mayer, Sergey Vitkalov, and A. A. Bykov

 Phys. Rev. B 91, 205439
 May 25th, 2015

We proudly to announce the publication of another manuscript in JETP Letters.

Interference of commensurate and microwave-induced oscillations of the magnetoresistance of a two-dimensional electron gas in a one-dimensional lateral superlattice                                                                  
A. A. Bykov, A. V. Goran, W. Mayer, and S. A. Vitkalov                                                                               JETP Letters, 2015, Vol. 101, No. 10, pp. 703–707


 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
Nanoscience NY

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.
  
 
January, 2015

Graduate students from the microwave lab will be giving the following talks at the upcoming APS March Meeting in San Antonio, TX:

Intersubband Oscillations in GaAs Quantum Wells with Three Populated Subbands

Jesse Kanter
Tuesday, March 3, 2015 at 12:15pm

Dynamics of Quantal Heating in Electron Systems with Discrete Spectra

William Mayer
Tuesday, March 3, 2015 at 11:51am

Broadband Coupling of Microwave Signals to Thin Conductors in Cryogenic Systems

Scott Dietrich
Monday, March 2, 2015 at 12:15pm

 
December, 2014

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.


  
October, 2014

Here is an advanced e-print of our latest publication:

Dynamics of Quantal Heating in Electron Systems with Discrete Spectra
Scott DietrichWilliam MayerSergey Vitkalov, and A. A. Bykov

Available at arXiv.org.
 
August, 2014

PhD student, Scott Dietrich, gave a talk entitled "Dynamics of Quantal Heating of 2D Electrons in Crossed Electric and Quantizing Magnetic Fields" at the 32nd International Conference on the Physics of Semiconductors in Austin, TX.

   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)
  
  
  
  
  


Research Supported by:

                      
City University of New York Research Office
City College of New York Division of Science