2 research outputs found
Unveiling the double-peak structure of quantum oscillations in the specific heat
Quantum oscillation phenomenon is an essential tool to understand the
electronic structure of quantum matter. Here we report the first systematic
study of quantum oscillations in the electronic specific heat in
natural graphite. We show that the crossing of a single spin Landau level and
the Fermi energy give rise to a double-peak structure, in striking contrast to
the single peak expected from Lifshitz-Kosevich theory. Intriguingly, the
double-peak structure is predicted by the kernel term for in the
free electron theory. The represents a spectroscopic tuning fork of
width 4.8 which can be tuned at will to resonance. Using a coincidence
method, the double-peak structure can be used to accurately determine the Lande
-factor of quantum materials. More generally, the tuning fork can be used to
reveal any peak in fermionic density of states tuned by magnetic field, such as
Lifshitz transition in heavy-fermion compounds.Comment: 22 pages, 5 figure