Valley polarization assisted spin polarization in two dimensions

V T Renard, B. A. Piot, X Waintal, G Fleury, D Cooper, Y Niida, David Tregurtha, A Fujiwara, Y Hirayama, Kei Takashina

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Abstract

Valleytronics is rapidly emerging as an exciting area of basic and applied research. In two-dimensional systems, valley polarization can dramatically modify physical properties through electron–electron interactions as demonstrated by such phenomena as the fractional quantum Hall effect and the metal-insulator transition. Here, we address the electrons’ spin alignment in a magnetic field in silicon-on-insulator quantum wells under valley polarization. In stark contrast to expectations from a non-interacting model, we show experimentally that less magnetic field can be required to fully spin polarize a valley-polarized system than a valley-degenerate one. Furthermore, we show that these observations are quantitatively described by parameter-free ab initio quantum Monte Carlo simulations. We interpret the results as a manifestation of the greater stability of the spin- and valley-degenerate system against ferromagnetic instability and Wigner crystalization, which in turn suggests the existence of a new strongly correlated electron liquid at low electron densities.
Original languageEnglish
Article number7230
Pages (from-to)1-8
Number of pages8
JournalNature Communications
Volume6
Early online date1 Jun 2015
DOIs
Publication statusPublished - 1 Jun 2015

Cite this

Renard, V. T., Piot, B. A., Waintal, X., Fleury, G., Cooper, D., Niida, Y., ... Takashina, K. (2015). Valley polarization assisted spin polarization in two dimensions. Nature Communications, 6, 1-8. [7230]. https://doi.org/10.1038/ncomms8230

Valley polarization assisted spin polarization in two dimensions. / Renard, V T; Piot, B. A.; Waintal, X; Fleury, G; Cooper, D; Niida, Y; Tregurtha, David; Fujiwara, A; Hirayama, Y; Takashina, Kei.

In: Nature Communications, Vol. 6, 7230, 01.06.2015, p. 1-8.

Research output: Contribution to journalArticle

Renard, VT, Piot, BA, Waintal, X, Fleury, G, Cooper, D, Niida, Y, Tregurtha, D, Fujiwara, A, Hirayama, Y & Takashina, K 2015, 'Valley polarization assisted spin polarization in two dimensions', Nature Communications, vol. 6, 7230, pp. 1-8. https://doi.org/10.1038/ncomms8230
Renard VT, Piot BA, Waintal X, Fleury G, Cooper D, Niida Y et al. Valley polarization assisted spin polarization in two dimensions. Nature Communications. 2015 Jun 1;6:1-8. 7230. https://doi.org/10.1038/ncomms8230
Renard, V T ; Piot, B. A. ; Waintal, X ; Fleury, G ; Cooper, D ; Niida, Y ; Tregurtha, David ; Fujiwara, A ; Hirayama, Y ; Takashina, Kei. / Valley polarization assisted spin polarization in two dimensions. In: Nature Communications. 2015 ; Vol. 6. pp. 1-8.
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