Possible Wigner solid phase transitions in a series of high-carrier-density two-dimensional hole gases
P J Rodgers; C J G M Langerak; B L Gallagher; R J Barraclough; M Henini; G Hill; S A J Wiegers; J A A J Perenboom; P J Rodgers; Dept. of Phys., Nottingham Univ., UK; C J G M Langerak; Dept. of Phys., Nottingham Univ., UK; B L Gallagher; Dept. of Phys., Nottingham Univ., UK; R J Barraclough; Dept. of Phys., Nottingham Univ., UK; M Henini; Dept. of Phys., Nottingham Univ., UK; G Hill; Dept. of Phys., Nottingham Univ., UK; S A J Wiegers; Dept. of Phys., Nottingham Univ., UK; J A A J Perenboom; Dept. of Phys., Nottingham Univ., UK
Журнал:
Journal of Physics: Condensed Matter
Дата:
1993-09-13
Аннотация:
Transport measurements on a series of high-mobility, high-carrier-density (1.0*10<sup>11</sup><or=n<sub>s</sub><or=1.6*10<sup>11</sup> cm<sup>-2</sup>) 2D hole systems in fields up to 30 T and temperatures down to 30 mK show transitions into a very-high-resistance state at a range of Landau level filling factors ( nu ) near 2/7. The insulating state shows clear voltage threshold behaviour and strong temperature dependence consistent with a strongly pinned Wigner solid. The authors also present measurements on a gated 2D hole gas which enabled the systematic variation of the carrier density near the Wigner solid phase boundary.
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