Sourin Das

Research Summary:

My research interest during the past one year has been mainly focussed on the application of Bosonization Techniques and Luttinger Liquid Theory to 1D Quantum Wires and Quantum Dots that are formed in both Heterostructure and Carbon Nanotubes. We have computed the Conductance of an assembly of Quantum wires and Dots with different coupled geometries (both in strong and weak coupling limits), which show interesting resonance features. We have studied the behaviour of conductance for both tunnel-coupled and capacitively-coupled quantum wires and dots.

We have also been looking at Coulomb Blockade Quantum Dots in the Kondo Regime.

Recently, we have also been working on Quantum Charge Pumping through tunneled coupled Quantum Dots and Quantum Rings.


Publications and Preprints:

(1) Transport through multiply crossed carbon nano-tubes, with Sumathi Rao, manuscript in preparation.
(2) Transport through multiply connected quantum wires, with Sumathi Rao, manuscript in preparation.
(3) Adiabatic charge pumping through a quantum ring, with Argha Banerjee and Sumathi Rao,manuscript in preparation.
(4) Quantised charge pumping through multiple quantum dots, with Argha Banerjee and Sumathi Rao, cond-mat/0307324.
(5) Effective action and interaction energy of coupled quantum dots, with Sumathi Rao, cond-mat/0209033, to appear in Phys. Rev. B.
(6) Scattering phase shifts in quasi-one-dimension, with Prosenjit Singha Deo and Swarnali Bandopadhyay, Int. Jour. of Mod. Phys. B16, 2247-2277 (2002).


Conference/Workshops Attended:

(1) National Conference on Theoretical Physics, TP-2003 at Indian Association for the Cultivation of Science ( I. A. C. S.) , 2A & 2B Raja S C Mullick Road, Jadavpur, Kolkata - 700 032 , India. (January 21 - 24 , 2003).

(2) Regional meeting on Correlated Electron Systems at Harish - Chandra Research Institute ( H. R. I.) , Allahabad - 211 019 , India. (December 05 - 08 , 2002).

Visits to other Institutes:

(1) Visited The Abdus Salam International Centre for Theoretical Physics at Trieste, Italy. (August 20, 2002 - September 28,2002).
(2) Visited the Department of Physics, 104 Davey Laboratory, Penn State University at University Park, PA - 16 802, USA. (July 31, 2001 - August 15, 2002).


Invited Lectures/Seminars:

(1) Presented a seminar on Effective action and interaction energy of coupled quantum dots. at H. R. I., Allahabad (October 11, 2002)

Other Activities :

(1) Served the Department of Physics, 104 Davey Laboratory, Penn State University at University Park, PA - 16 802, USA as a Teaching Assistant for the Under Graduate course on Electricity and Magnetism for 2 semesters (Fall 2001 and Spring 2002).
(2) Served the Department of Physics, 104 Davey Laboratory, Penn State University at University Park, PA - 16 802, USA as a Lecturer and Course Adminstrator for the Under Graduate course on Mechanics during Summer 2002.