Magnetic field-induced helical mode and topological transitions in a topological insulator nanoribbon

Nature Nanotechnology
Luis A JaureguiYong P Chen

Abstract

The spin-helical Dirac fermion topological surface states in a topological insulator nanowire or nanoribbon promise novel topological devices and exotic physics such as Majorana fermions. Here, we report local and non-local transport measurements in Bi2Te3 topological insulator nanoribbons that exhibit quasi-ballistic transport over ∼2 μm. The conductance versus axial magnetic flux Φ exhibits Aharonov-Bohm oscillations with maxima occurring alternately at half-integer or integer flux quanta (Φ0 = h/e, where h is Planck's constant and e is the electron charge) depending periodically on the gate-tuned Fermi wavevector (kF) with period 2π/C (where C is the nanoribbon circumference). The conductance versus gate voltage also exhibits kF-periodic oscillations, anti-correlated between Φ = 0 and Φ0/2. These oscillations enable us to probe the Bi2Te3 band structure, and are consistent with the circumferentially quantized topological surface states forming a series of one-dimensional subbands, which undergo periodic magnetic field-induced topological transitions with the disappearance/appearance of the gapless Dirac point with a one-dimensional spin helical mode.

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Citations

Sep 7, 2019·Advanced Materials·Yumei JingHongqi Xu
May 3, 2018·Beilstein Journal of Nanotechnology·Sigurdur I ErlingssonAndrei Manolescu
Mar 30, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Abhishek BanerjeeP S Anil Kumar
Aug 5, 2017·Physical Review Letters·Sigurdur I ErlingssonDavid Sanchez
Jul 26, 2017·Scientific Reports·Ratnadwip SinghaPrabhat Mandal
Aug 28, 2020·Nanoscale Research Letters·Shiu-Ming HuangMitch M C Chou
Feb 8, 2020·Physical Review Letters·Naijia LiuJan Schroers
Feb 17, 2021·Nature Communications·Felix MünningYoichi Ando
Jan 30, 2021·Physical Review Letters·Cai-Zhen LiZhi-Min Liao
Jun 25, 2021·Science Advances·Daniel RosenbachThomas Schäpers
Jul 21, 2021·Nanotechnology·Javier OscaLlorenç Serra
Apr 15, 2020·ACS Nano·An-Qi WangZhi-Min Liao

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