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Condensed Matter > Strongly Correlated Electrons

Title: Simple mechanisms for magnetooscillations NOT to detect Berry phase

Abstract: Phase of quantum magnetooscilalions is often associated with the Berry phase and is widely used to argue in favor of topological non-triviality of the system (Berry phase $2\pi n+\pi$). Nevertheless, the experimentally determined value may deviate from $2\pi n+\pi$ arbitrarily. In this paper we suggest two simple mechanisms drammatically affecting the experimentally observed value of the phase in three-dimensional topological insulators: (i) magnetic field dependence of the chemical potential, and (ii) possible non-uniformity of the system. These mechanisms are not limited to topological insulators and can be extended to other topologically trivial and non-trivial systems.
Comments: 7 pages, 4 figures
Subjects: Strongly Correlated Electrons (cond-mat.str-el); Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Cite as: arXiv:1803.06618 [cond-mat.str-el]
  (or arXiv:1803.06618v1 [cond-mat.str-el] for this version)

Submission history

From: Alexander Kuntsevich [view email]
[v1] Sun, 18 Mar 2018 07:32:12 GMT (148kb)