Spin-independent origin of the strongly enhanced effective mass in a dilute 2D electron system.
We accurately measure the effective mass in a dilute two-dimensional electron system in silicon by analyzing the temperature dependence of the Shubnikov-de Haas oscillations in the low-temperature limit. A sharp increase of the effective mass with decreasing electron density is observed. We find that the enhanced effective mass is independent of the degree of spin polarization, which points to a spin-independent origin of the mass enhancement and is in contradiction with existing theories.
Shashkin
A A
AA
Physics Department, Northeastern University, Boston, Massachusetts 02115, USA.
Rahimi
Maryam
M
Anissimova
S
S
Kravchenko
S V
SV
Dolgopolov
V T
VT
Klapwijk
T M
TM