Method and device for detecting electron spin transient information

A technology of electron spin and transient information, which can be used in measurement devices, radiation measurement, particle motion recording, etc.

Active Publication Date: 2019-03-29
EAST CHINA NORMAL UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, in general, the pump-probe technique is difficult to distinguish the electronic spin information of

Method used

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  • Method and device for detecting electron spin transient information
  • Method and device for detecting electron spin transient information
  • Method and device for detecting electron spin transient information

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Embodiment

[0019] Ce doped with YAG crystal 3+ Taking the spin detection of ions as an example, under the action of a continuous laser with a wavelength of 473nm, electrons will obtain a transition from the ground state 4f energy level to the excited state 5d energy level. figure 1 It is a specific device for detecting the transient process of electron spin. The 473nm laser is generated by a diode-pumped low-noise solid-state continuous laser. The continuous laser source obtains periodically and continuously switched left-handed and right-handed circularly polarized light through a polarizer, an electro-optic modulator and a 1 / 4 wave plate; the fluorescence detection window is set at 528-537nm, and the light is collected through a convex lens, and the filter The excitation light is filtered out, the fluorescence enters the avalanche photodiode through a 1 / 4 wave plate and an analyzer, and the signal finally enters the digital oscilloscope for detection.

[0020] figure 2 For specific...

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Abstract

The invention discloses a method and a device for detecting electron spin transient information. The method is particularly used for detecting a spin longitudinal relaxation transient process of a long-life electron with hundred-nanosecond to hundred-millisecond magnitude, and belongs to the crossed field of laser application technology and spintronics. The method is characterized in that left-hand and right-hand circular polarization laser which is periodically and continuously switched is used for exciting a material so that a spin non-balanced period of the electron dynamically evolves. Thelight emitting transient process of the detected material can reflect evolution of layout number of the electrons in different electron energy grades, and furthermore electron spin relaxation time and spin polarization are estimated. The method and the device have advantages of high detecting sensitivity, easy quantitative analysis for spin polarization, capability of detecting the spin evolutionof the long-lifetime electron, easy detection for spin information of ground state electron, etc.

Description

technical field [0001] The invention belongs to the interdisciplinary field of laser application technology and spintronics, and relates to a method and device for detecting transient information of electron spins; especially for detecting longitudinal relaxation of long-lived electron spins on the order of hundreds of nanoseconds to hundreds of milliseconds transient process. Background technique [0002] The electron spins of semiconductor quantum dots and rare earth ion-doped solid-state systems have long spin lifetimes, which are expected to be used in the solid-state realization of quantum information processing; using the spin degree of freedom of electrons, it is expected to develop a new generation of spin-based information carriers Quantum devices with low power consumption, high speed, and high integration density. In recent years, the polarization of electron spin and the detection of its transient process have attracted extensive attention of researchers. [00...

Claims

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Application Information

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IPC IPC(8): G01T5/00
CPCG01T5/00
Inventor 梁盼冯东海吴真张圆圆胡蓉蓉郭家兴
Owner EAST CHINA NORMAL UNIV
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