Excitation gaps in the fractional quantum Hall effect in tetracene
19 February 2001
We have measured the temperature dependence of the fractional quantum Hall effect at filling factors v = 1/3, 2/3, and 2/5 in tetracene in order to determine the associated excitation gaps. The stronger two-dimensional confinement of the hole gas compared to conventional inorganic semiconductors as well as the strong electron-electron interactions result in larger excitation gaps. As a result, the fractional quantum Hall effect is observable at moderately high temperatures. An excitation gap of 24 K at 9 T is estimated for v = 1/3.