Journal
PHYSICAL REVIEW LETTERS
Volume 96, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.96.236801
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The valley splitting, which lifts the degeneracy of the lowest two valley states in a SiO2/Si(100)/SiO2 quantum well, is examined through transport measurements. We demonstrate that the valley splitting can be observed directly as a step in the conductance defining a boundary between valley-unpolarized and -polarized regions. This persists to well above liquid helium temperature and shows no dependence on magnetic field, indicating that single-particle valley splitting and valley polarization exist in (100) silicon even at zero magnetic field.
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