Kavli Affiliate: Anton Akhmerov
| First 5 Authors: Kostas Vilkelis, Ady Stern, Anton Akhmerov, ,
| Summary:
Orbital diamagnetism requires closed orbits according to the
Liftshiftz-Kosevich theory. Therefore, one might expect that open Fermi
surfaces do not have a diamagnetic response. Contrary to this expectation, we
show that open orbits in finite systems do contribute a magnetic response which
oscillates between diamagnetism and paramagnetism. The oscillations are similar
to the Aharonov-Bohm effect, because the oscillation phase is set by the number
of flux quanta through the area defined by the width of the sample and the
distance between adjacent atomic layers. The magnetic response originates from
the closed trajectories formed by counter-propagating open orbits coupled via
specular boundary reflections. The phenomenon acts as a probe of the phase
coherence of open electron trajectories.
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