Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-04-17
Phys. Rev. B 80, 121303(R) (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 3 figures
Scientific paper
10.1103/PhysRevB.80.121303
We calculate the valley degeneracy ($g_v$) dependence of the many-body renormalization of quasiparticle properties in multivalley 2D semiconductor structures due to the Coulomb interaction between the carriers. Quite unexpectedly, the $g_v$ dependence of many-body effects is nontrivial and non-generic, and depends qualitatively on the specific Fermi liquid property under consideration. While the interacting 2D compressibility manifests monotonically increasing many-body renormalization with increasing $g_v$, the 2D spin susceptibility exhibits an interesting non-monotonic $g_v$ dependence with the susceptibility increasing (decreasing) with $g_v$ for smaller (larger) values of $g_v$ with the renormalization effect peaking around $g_v\sim 1-2$. Our theoretical results provide a clear conceptual understanding of recent valley-dependent 2D susceptibility measurements in AlAs quantum wells.
Hwang Euyheon H.
Li Qian
Sarma Sankar Das
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