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Magnetization of a strongly interacting two-dimensional electron system in perpendicular magnetic fields
S Anissimova1, A Venkatesan, A A Shashkin
1Physics Department, Northeastern University, Boston, Massachusetts 02115, USA.
Physical Review Letters
|February 21, 2006
Summary
We measured thermodynamic magnetization in a two-dimensional electron system. Intralevel interactions significantly alter magnetization without changing key spectrum characteristics like the Landé g factor and cyclotron mass.
Area of Science:
- Condensed matter physics
- Materials science
Background:
- Strongly correlated electron systems exhibit complex behaviors.
- Understanding two-dimensional electron systems (2DES) is crucial for quantum electronics.
Purpose of the Study:
- To measure thermodynamic magnetization in a low-disordered 2DES in silicon.
- To determine spectrum characteristics (Landé g factor and cyclotron mass) using a novel method.
- To investigate the impact of intralevel interactions on magnetization.
Main Methods:
- Thermodynamic magnetization measurements in perpendicular magnetic fields.
- A new parameter-free method to determine Landé g factor (g*) and cyclotron mass (m*).
- Measurements conducted with the Fermi level outside spectral gaps, avoiding interlevel quasiparticle interactions.
Main Results:
- A parameter-free method successfully determined g* and m* in the 2DES.
- Intralevel interactions were observed to strongly modify thermodynamic magnetization.
- The determined g* and m* remained unaffected by intralevel interactions.
Conclusions:
- Intralevel interactions play a significant role in the thermodynamic magnetization of 2DES.
- The novel method provides accurate determination of spectrum characteristics.
- This research advances the understanding of strongly correlated electron systems in silicon.
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