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Spin and Valley Effects on the Quantum Phase Transition in Two Dimensions

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Abstract

Using several independent methods, we find that the metal-insulator transition occurs in the strongly-interacting two-valley two-dimensional electron system in ultra-high mobility SiGe/Si/SiGe quantum wells in zero magnetic field. The transition survives in this system in parallel magnetic fields strong enough to completely polarize the electrons’ spins, thus making the electron system “spinless.” In both cases, the resistivity on the metallic side near the transition increases with decreasing temperature, reaches a maximum at a temperature Tmax, and then decreases. The decrease reaches more than an order of magnitude in zero magnetic field. The value of Tmax in zero magnetic field is found to be close to the renormalized Fermi temperature. However, rather than increasing along with the Fermi temperature, the value Tmax decreases appreciably for spinless electrons in spin-polarizing magnetic fields. The observed behavior of Tmax cannot be described by existing theories. The results indicate the spin-related origin of the effect. At the same time, the low-temperature resistivity drop in both spin-unpolarized and spinless electron systems is described quantitatively by the dynamical mean-field theory.

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Funding

A.A.S. was supported by RSF grant no. 22-22-00333. S.V.K. was supported by NSF grant no. 1904024.

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Authors and Affiliations

  1. Institute of Solid State Physics, 142432, Chernogolovka, Moscow oblast, Russia

    A. A. Shashkin

  2. Physics Department, Northeastern University, 02115, Boston, Massachusetts, USA

    S. V. Kravchenko

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  1. A. A. Shashkin
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  2. S. V. Kravchenko
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Correspondence to A. A. Shashkin or S. V. Kravchenko.

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ADDITIONAL INFORMATION

This article was prepared for the special issue of Journal of Experimental and Theoretical Physics dedicated to the 95th birthday of Professor E.I. Rashba.

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Shashkin, A.A., Kravchenko, S.V. Spin and Valley Effects on the Quantum Phase Transition in Two Dimensions. J. Exp. Theor. Phys. 135, 432–439 (2022). https://doi.org/10.1134/S1063776122100119

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