scholarly journals Photoluminescence spectroscopy of the low-density two-dimensional electron system in electric fields

2010 ◽  
Vol 3 (2) ◽  
pp. 1183-1188
Author(s):  
M. Yamaguchi ◽  
S. Nomura ◽  
H. Tamura ◽  
T. Akazaki
Keyword(s):  
Electric Fields ◽  
Electron System ◽  
Photoluminescence Spectroscopy ◽  
Low Density ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Dimensional Electron System

scholarly journals Magnetotransport in a two-dimensional electron system in dc electric fields

2007 ◽  
Vol 75 (4) ◽  
Author(s):  
W. Zhang ◽  
H.-S. Chiang ◽  
M. A. Zudov ◽  
L. N. Pfeiffer ◽  
K. W. West
Keyword(s):  
Electric Fields ◽  
Electron System ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Dimensional Electron System ◽  
Dc Electric Fields

scholarly journals Observation of spontaneous ferromagnetism in a two-dimensional electron system

2020 ◽  
Vol 117 (51) ◽  
pp. 32244-32250
Author(s):  
M. S. Hossain ◽  
M. K. Ma ◽  
K. A. Villegas Rosales ◽  
Y. J. Chung ◽  
L. N. Pfeiffer ◽  
...  
Keyword(s):  
Electron Density ◽  
Ground States ◽  
Electron System ◽  
Low Density ◽  
Ferromagnetic Transition ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Electron Effective Mass ◽  
Wigner Solid ◽  
Dimensional Electron System

What are the ground states of an interacting, low-density electron system? In the absence of disorder, it has long been expected that as the electron density is lowered, the exchange energy gained by aligning the electron spins should exceed the enhancement in the kinetic (Fermi) energy, leading to a (Bloch) ferromagnetic transition. At even lower densities, another transition to a (Wigner) solid, an ordered array of electrons, should occur. Experimental access to these regimes, however, has been limited because of the absence of a material platform that supports an electron system with very high quality (low disorder) and low density simultaneously. Here we explore the ground states of interacting electrons in an exceptionally clean, two-dimensional electron system confined to a modulation-doped AlAs quantum well. The large electron effective mass in this system allows us to reach very large values of the interaction parameterrs, defined as the ratio of the Coulomb to Fermi energies. As we lower the electron density via gate bias, we find a sequence of phases, qualitatively consistent with the above scenario: a paramagnetic phase at large densities, a spontaneous transition to a ferromagnetic state whenrssurpasses 35, and then a phase with strongly nonlinear current-voltage characteristics, suggestive of a pinned Wigner solid, whenrsexceeds≃38. However, our sample makes a transition to an insulating state atrs≃27, preceding the onset of the spontaneous ferromagnetism, implying that besides interaction, the role of disorder must also be taken into account in understanding the different phases of a realistic dilute electron system.

scholarly journals Spin Susceptibility of an Ultra-Low-Density Two-Dimensional Electron System

2003 ◽  
Vol 90 (5) ◽  
Author(s):  
J. Zhu ◽  
H. L. Stormer ◽  
L. N. Pfeiffer ◽  
K. W. Baldwin ◽  
K. W. West
Keyword(s):  
Electron System ◽  
Spin Susceptibility ◽  
Low Density ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Dimensional Electron System

Electron-hole separation in a two-dimensional electron system induced by electric fields

1997 ◽  
Vol 101 (2) ◽  
pp. 103-107 ◽  
Author(s):  
F. Plentz ◽  
D. Heiman ◽  
A. Pinczuk ◽  
L.N. Pfeiffer ◽  
K.W. West
Keyword(s):  
Electric Fields ◽  
Electron System ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Electron Hole ◽  
Dimensional Electron System
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