"Demonstration of electron filtering to increase the Seebeck Coefficient in In[sub 0.53] Ga[sub 0.47] As/In[sub 0.53] Ga[sub 0.28] Al [sub 0.19] As superlattices"
J. M Zide, D. Vashaee, Z. X. Brian, G. Zeng, J. E. Bowers, A. Shakouri, and A. C. Gossard
Physical Review B
Vol. 74, No. 20
December 1, (2006)