Influence of temperature on the magnetic oscillations in graphene with spin splitting: a new approach
arXiv:1806.02152 · doi:10.1088/1361-648X/aac7ea
Abstract
We analyze the magnetic oscillations (MO) in pristine graphene, under a perpendicular magnetic field, taking into account the Zeeman effect. We consider a constant Fermi energy, such that the valence band is always full and only the conduction band is available. At zero temperature the MO consist of two sawtooth peaks, one for each spin. Both peaks have the same frequency, but different amplitude and phase. We show that, in order to observe the spin splitting in the MO, Fermi energy of about 0.1 eV is required. At low temperatures we obtain that the MO can be expressed as the MO at zero temperature, plus small Fermi-Dirac like functions, each centered around the MO peaks. Using this expression, we show that the spin splitting is observable in the MO only when the thermal energy is smaller than the Zeeman energy. We also analyze the shift of the MO extrema as the temperature increases. We show that it depends on the magnetic field, which implies a broken periodicity at nonzero temperature. Finally, we obtain an analytical expression for the MO envelope.
22 pages, 9 figures. Published version
References in corpus (7)
- The electronic properties of graphene
- Fermi velocity engineering in graphene by substrate modification
- Semiconductor few-electron quantum dot operated as a bipolar spin filter
- Ground state magnetization of conduction electrons in graphene with Zeeman effect
- Magnetic oscillations in silicene
- Valley properties of doped graphene in a magnetic field
- Magnetization in pristine graphene with Zeeman splitting and variable spin-orbit coupling