Valley susceptibility of an interacting two-dimensional electron system.
We report direct measurements of the valley susceptibility, the change of valley population in response to an applied symmetry-breaking strain, in an AlAs two-dimensional electron system. As the two-dimensional density is reduced, the valley susceptibility dramatically increases relative to its band value, reflecting the system's strong electron-electron interaction. The increase has a remarkable resemblance to the enhancement of the spin susceptibility and establishes the analogy between the spin and valley degrees of freedom.
Gunawan
O
O
Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.
Shkolnikov
Y P
YP
Vakili
K
K
Gokmen
T
T
De Poortere
E P
EP
Shayegan
M
M