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π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

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In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as annulenes. In...
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Aharonov-casher effect in Bi2Se3 square-ring interferometers.

Fanming Qu1, Fan Yang, Jun Chen

  • 1Daniel Chee Tsui Laboratory, Institute of Physics, Chinese Academy of Sciences, Beijing, People's Republic of China.

Physical Review Letters
|July 30, 2011
PubMed
Summary
This summary is machine-generated.

Researchers explored electrical control of spin dynamics in bismuth selenide (Bi(2)Se(3)) using ring interferometers. They observed unique resistance oscillations and demonstrated significant tunability of spin precession, highlighting Bi(2)Se(3) for spintronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Bismuth selenide (Bi(2)Se(3)) exhibits strong spin-orbit coupling, a key property for spintronic applications.
  • Controlling spin dynamics electrically is crucial for developing next-generation electronic devices.

Purpose of the Study:

  • To investigate the electrical control of spin dynamics in Bi(2)Se(3) using ring-type interferometers.
  • To explore the potential of Bi(2)Se(3) in novel spintronic devices.

Main Methods:

  • Fabrication of ring-type interferometers using Bi(2)Se(3).
  • Measurement of resistance oscillations under varying magnetic fields and gate voltages.
  • Analysis of Aharonov-Bohm, Altshuler-Aronov-Spivak, and Aharonov-Casher effects.

Main Results:

  • Observation of Aharonov-Bohm and Altshuler-Aronov-Spivak resistance oscillations with magnetic field.
  • Observation of Aharonov-Casher resistance oscillations with gate voltage, indicating a Berry phase of π.
  • Demonstration of significant tunability of the spin precession angle via gate voltage.

Conclusions:

  • Bi(2)Se(3) exhibits robust spin-dependent transport phenomena.
  • The large tunability of spin precession angle confirms Bi(2)Se(3) as a promising material for spintronic applications.
  • Strong spin-orbit coupling in Bi(2)Se(3) facilitates electrical control of spin dynamics.