Resistivity measurements of a black phosphorus (bP) field-effect transistor 16 nm thick in parallel magnetic fields up to 45 T are reported as a function of the angle between the in-plane field and the source-drain (S-D) axis of the device. The crystallographic directions of the bP crystal are determined by Raman spectroscopy, with the zigzag axis found to be within 5° of the S-D axis and the armchair axis in the orthogonal planar direction. A transverse magnetoresistance (TMR) as well as a classically forbidden longitudinal magnetoresistance (LMR) are observed. Both are found to be strongly anisotropic and nonmonotonic with increasing in-plane field. Surprisingly, the relative magnitude (in %) of the positive LMR is larger than the TMR above ?32 T. Considering the known anisotropy of bP whose zigzag and armchair effective masses differ by a factor of ?7, the experiment strongly suggests this LMR to be a consequence of the anisotropic Fermi surface of bP.
Nonclassical Longitudinal Magnetoresistance in Anisotropic Black Phosphorus
Telesio F.;Serrano Ruiz M.;Caporali M.;Peruzzini M.;Carrega M.;Heun S.;
2020
Abstract
Resistivity measurements of a black phosphorus (bP) field-effect transistor 16 nm thick in parallel magnetic fields up to 45 T are reported as a function of the angle between the in-plane field and the source-drain (S-D) axis of the device. The crystallographic directions of the bP crystal are determined by Raman spectroscopy, with the zigzag axis found to be within 5° of the S-D axis and the armchair axis in the orthogonal planar direction. A transverse magnetoresistance (TMR) as well as a classically forbidden longitudinal magnetoresistance (LMR) are observed. Both are found to be strongly anisotropic and nonmonotonic with increasing in-plane field. Surprisingly, the relative magnitude (in %) of the positive LMR is larger than the TMR above ?32 T. Considering the known anisotropy of bP whose zigzag and armchair effective masses differ by a factor of ?7, the experiment strongly suggests this LMR to be a consequence of the anisotropic Fermi surface of bP.| File | Dimensione | Formato | |
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Descrizione: "This is the peer reviewed version of the following article: Telesio, F., Hemsworth, N., Dickerson, W., Petrescu, M., Tayari, V., Yu, O., Graf, D., Serrano-Ruiz, M., Caporali, M., Peruzzini, M., Carrega, M., Szkopek, T., Heun, S. and Gervais, G. (2020), Nonclassical Longitudinal Magnetoresistance in Anisotropic Black Phosphorus. Phys. Status Solidi RRL, 14: 1900347, which has been published in final form at https://doi.org/10.1002/pssr.201900347. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited."
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