Dr. Ajeet Kumar
Dr. Ajeet Kumar's picture

User Info

Profile Name
Dr. Ajeet Kumar
Current Designation
Scientist
Residential Address

Room No. 33 and 116, Main Building,
National Physical Laboratory,
Dr. K.S. Krishnan Road,
New Delhi-11001

Telephone 1
1145608570
Grade
007
Brief Biodata
  • DP/DU No. and Name:
    6.05, Quantum Phenomenon and Applications
  • Current position and Address:

    Scientist, Quantum Phenomenon and Applications

    Room No. 33 and 116, Main Building,

    National Physical Laboratory,

    Dr. K.S. Krishnan Road,

    New Delhi-11001

  • Educational Qualifications:
  • Degree

    Subject

    University/Institute

    Year

    Ph. D.

    Nanotechnology

    Pennsylvania State University, USA

    2005-2010

    Intg 5Yr M.S.

    Chemistry

    Indian Institute of Technology Bombay, Mumbai, India

    2000-2005

  • Academics/Research Experience:
  • Year

    Duration

    Research field

    University / Institute

    Position

    Aug 2012 - present

     

    Transport properties in single molecule and single quantum-dot devices

    Quantum Phenomenon and Applications, CSIR - NPL, India.

    Scientist

    Oct. 2010 – June 2012

    One year nine months

    Development of new etching processes for next generation microprocessors

    PTD, Intel Corporation, Hillsboro, OR, USA

    Process RnD Engineer

    Aug 2005 - May 2010

    Four years ten months

    Control and Measurement of Single Molecules and Their Nanoscale Assemblies to Develop Molecular Machinery

    Pennsylvania State University, USA

    Ph. D.

  • Date of Joining NPL:
  •  
    31 August 2012
  • No. of Publications:
  •     SCI Journals

         Conference/ proceedings

          Books

         Total

               05

                       0

     0

            5

  • Current Activity :
  • Quantum Transport through novel quantum devices and Spintronics


    Primary goal of our research:
    • Nanofabrication using state-of-the-art focused ion beam (FIB) and E-beam lithography instruments.
    • Transport through single-molecule, metal-nanoparticle, and carbon-based quantum dots using various measurement techniques, such as probe station (RT and Liquid-He), MPMS, and liquid-He cryostat.
    • Tunneling spectroscopy in devices fabricated.


      We are interested in making electronic devices from single molecules and single quantum-dots. These devices show interesting physical properties due to their small size. Work has been done previously on such devices by other research groups. A few examples of such research are the fabrication of transistors from single Carbon-60 molecules, carbon nanotubes and conjugated organic molecules.


      In order to make devices, we have to first create two gold electrodes that are 1-2 nm apart. We start by making a thin gold wire, and then apply some voltage across the ends of the wire. The wire is like a tiny fuse - at some voltage and current it will break. If this procedure is done right, the break in the wire can be as small as 0.5 - 2 nm. After this it will be ready to stick various subject systems between the electrodes. In order to be able to stabilize small molecules between the gold contacts, we have to cool it down to low temperatures.


      The main feature of the transport properties of devices made with a molecule or a quantum dot is that they exhibit "coulomb blockade". The feature of this experiment is that the molecule or quantum dot is exactly one atom which gives the situation to study the electron-in-a-box quantum energy level states. If the molecule or quantum dot is magnetic and has a strong coupling with the electrodes, Kondo effect can be observed. The Kondo effect has many interesting consequences, such as the splitting of the conductance peak in a high magnetic field.

      *Interested motivated students with JRF can contact me for PhD*
  • Honours and Award:
    • Inspire Faculty Award Fellowship, July 2012.
    • Miller Fellowship Award for outstanding research effort, Department of Chemistry, Penn State, 2008-2009.
    • Graduate Fellowship for research accomplishments, Materials Research Institute, Penn State, 2007-2008.
    • Best Poster Award, Division of Colloid and Surface Chemistry, American Chemical Society, Fall National Meeting, Boston, 2007.
    • Incoming Graduate Student Award for outstanding graduate coursework and excellent teaching performance, Department of Chemistry, Penn State, 2006-07.
    • Dan H. Waugh Memorial Teaching Award Honorable Mention for exceptional efforts in teaching duties, Department of Chemistry, Penn State, 2006.
    • Roberts Fellowship, Department of Chemistry, Penn State, 2005.
  • Representative publications
    • Reversible Photo-Switching of Single Azobenzene Molecules in Controlled Nanoscale Environment, NANO LETTERS, Vol. 8, 1644-1648, 2008.
    • A Nanomechanical Actuator Driven Electrochemically by Artificial Molecular Muscles, ACS NANO, Vol. 3, 291, 2009.
    • Station Changing of Single Rotaxane Molecules under Electrochemical Control, ACS NANO, Vol. 4, 3697, 2010.
Alumni
No
Profile Department
Quantum Phenomena & Applications

History

Member for
3 years 51 weeks

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