Research Interests

• My research interest is in the field of condensed matter physics, particularly the theory of strongly correlated electron systems. Novel phenomena observed in low dimensional electron systems at low temperatures have been the subject of my work during past few years.
Recent advancements in technology has made it possible to fabricate extremely small structures, of the size of nanometers ( 10^-9 meters).

Nanostructures like nanorings or nanowires as one dimensional example are capable of remarkably different physical behavior than what we expect from past experiments.

• The quantum coherence of electrons observed in two dimensional double quantum wells known as Bilayer Quantum Hall Systems is another example of physically rich and technologically challenging part of the condensed matter physic.
Currently I am working on the problem of energy storage in antiferroelectric liquid crystals ( Smectic C_A) at Case university with Prof. Rolfe Petschek.

Brief Description of Research

Textures in Bilayer Quantum Hall Systems
Combine Spin Pseudospin in Quantum Hall Systems
Nano Rings

Selected Publications

Polarization Transitions in Quantum Ring Arrays
Bahman Roostaei and Kieran J. Mullen, A. T. Rezakhani
 Phys. Rev. B 78, 075411 (2008)

Pseudo spin vortex-antivortex states with interwoven spin textures
in double layer quantum Hall systems
J. Bourassa, B. Roostaei, R. Cote, H. A. Fertig and K. Mullen
Phys. Rev. B. 74, 195320 (2006)
Selected for the November 27, 2006 issue of Virtual Journal of Nanoscale Science & Technology.

Theory of activated transport in bilayer quantum Hall systems
Bahman Roostaei, Kieran Mullen, Herbert Fertig, Steven Simon
Phys. Rev. Lett. 101, 046804 (2008)