Work

Quantum Capacitance of a Topological Insulator-Ferromagnet Interface

Year: 2017

Type: article

Abstract: We study the quantum capacitance in a topological insulator thin film system magnetized in the in-plane direction in the presence of an out-of-plane magnetic field and hexagonal warping. To first order, the modification in quantum capacitance due to hexagonal warping compared to the clean case, where both the in-plane magnetization and hexagonal warping are absent, is always negative, and increases in magnitude monotonically with the energy difference from the charge neutrality point. In contrast, the change in the quantum capacitance due to in-plane magnetization oscillates with the energy in general, except when a certain relation between the inter-surface coupling, out of plane Zeeman energy splitting and magnetic field strength is satisfied. In this special case, the quantum capacitance remains unchanged by the in-plane magnetization for all energies.

Source: Scientific Reports

DOI: 10.1038/srep45016

Authors: Zhuo Bin Siu, Debashree Chowdhury, Mansoor B. A. Jalil, Banasri Basu

Institutions: National University of Singapore, Harish-Chandra Research Institute, Indian Statistical Institute

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,690

Funders: National Research Foundation, National Research Foundation Singapore, Ministry of Education, India