scholarly journals Microwave resonance in a high-quality GaAs/AlGaAs two-dimensional electron system in the low-density and low-mobility condition

2019 ◽  
Vol 100 (15) ◽  
Author(s):  
R. G. Mani ◽  
A. Kriisa ◽  
C. Reichl ◽  
W. Wegscheider
Keyword(s):  
Electron System ◽  
Low Density ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
High Quality ◽  
Microwave Resonance ◽  
Dimensional Electron System

High‐quality two‐dimensional electron system confined in an AlAs quantum well

1993 ◽  
Vol 62 (24) ◽  
pp. 3120-3122 ◽  
Author(s):  
T. S. Lay ◽  
J. J. Heremans ◽  
Y. W. Suen ◽  
M. B. Santos ◽  
K. Hirakawa ◽  
...  
Keyword(s):  
Quantum Well ◽  
Electron System ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
High Quality ◽  
Dimensional Electron System

scholarly journals AC MAGNETOTRANSPORT IN REENTRANT INSULATING PHASES OF TWO-DIMENSIONAL ELECTRONS NEAR 1/5 AND 1/3 LANDAU FILLINGS

2004 ◽  
Vol 18 (27n29) ◽  
pp. 3553-3556
Author(s):  
YONG P. CHEN ◽  
Z. H. WANG ◽  
R. M. LEWIS ◽  
P. D. YE ◽  
L. W. ENGEL ◽  
...  
Keyword(s):  
High Frequency ◽  
Electron System ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
High Quality ◽  
Data Support ◽  
Resonant Behavior ◽  
Dimensional Electron System ◽  
Insulating Phase

We have measured high frequency magnetotransport of a high quality two-dimensional electron system (2DES) near the reentrant insulating phase (RIP) at Landau fillings (ν) between 1/5 and 2/9. The magnetoconductivity in the RIP has resonant behavior around 150 MHz, showing a peak at ν~0.21. Our data support the interpretation of the RIP as due to some pinned electron solid. We have also investigated a narrowly confined 2DES recently found to have a RIP at 1/3<ν<1/2 and we have revealed features, not seen in DC transport, that suggest some intriguing interplay between the 1/3 FQHE and RIP.

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
Sign in / Sign up

Export Citation Format

Share Document