Schnol's Theorem and Spectral Properties of Massless Dirac Operators with Scalar Potentials

作者：Schmidt Karl Michael^*; Umeda Tomio

来源：Letters in Mathematical Physics, 2015, 105(11): 1479-1497.

DOI：10.1007/s11005-015-0799-1

• massless Dirac operators
• scalar potentials
• graphene
• embedded eigenvalues

The spectra of massless Dirac operators are of essential interest, e.g., for the electronic properties of graphene, but fundamental questions such as the existence of spectral gaps remain open. We show that the eigenvalues of massless Dirac operators with suitable real-valued potentials lie inside small sets easily characterized in terms of properties of the potentials, and we prove a Schnol-type theorem relating spectral points to polynomial boundedness of solutions of the Dirac equation. Moreover, we show that, under minimal hypotheses which leave the potential essentially unrestrained in large parts of space, the spectrum of the massless Dirac operator covers the whole real line; in particular, this will be the case if the potential is nearly constant in a sequence of regions.

• 出版日期2015-11