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In this paper we study in detail different types of topological solitonswhich are possible in bilayer quantum Hall systems at filling fraction $\nu =1$when spin degrees of freedom are included. Starting from a microscopicHamiltonian we derive an effective energy functional for studying suchexcitations. The gauge invariance and $CP^{3}$ character of this energyfuctional and their consequences are examined. Then we identify permissibleclasses of finite energy solutions which are topologically non-trivial. We alsonumerically evaulate a representative solution in which a pseudospin (layerdegrees of freedom) bimeron in a given spin component is intertwined withspin-skyrmions in each layer, and and discuss whether it is energeticallyfavoured as the lowest lying excitation in such system with some numericalresults.Comment: Revised version with more numerical results one more figure and table  added. Total 32 pages,6 Postscript figures. Correspondence to  sankalpa@imsc.ernet.i

physical review. b, condensed matter

Quantum Hall solitons with intertwined spin and pseudospin at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ν</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mn /></mml:math>

Quantum Hall solitons with intertwined spin and pseudospin atν=1