华东师范大学学报（自然科学版） >

2021 , Vol. 2021 >Issue 1: 92 - 102

DOI: https://doi.org/10.3969/j.issn.1000-5641.202022005

物理学与电子学

CdS晶体电子自旋相干动力学

  • 郭家兴 ,
  • 吴真 ,
  • 梁盼 ,
  • 姜美珍 ,
  • 胡蓉蓉 ,
  • 张圆圆 ,
  • 冯东海
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  • 1. 华东师范大学 精密光谱科学与技术国家重点实验室, 上海　200241
    2. 上海电机学院 文理学院, 上海　201306
    3. 上海应用技术大学 理学院, 上海　200235

收稿日期: 2020-03-14

  网络出版日期: 2021-01-28

基金资助

国家自然科学基金(91950112); 上海市自然科学基金(19ZR1414500)

收起

Electron spin coherence dynamics in CdS crystals

  • Jiaxing GUO ,
  • Zhen WU ,
  • Pan LIANG ,
  • Meizhen JIANG ,
  • Rongrong HU ,
  • Yuanyuan ZHANG ,
  • Donghai FENG
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  • 1. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai　200241, China
    2. College of Arts and Sciences, Shanghai Dianji University, Shanghai　201306, China
    3. Colloge of Sciences, Shanghai Institute of Technology, Shanghai　200235, China

Received date: 2020-03-14

  Online published: 2021-01-28

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摘要

利用时间分辨克尔旋转(Time-Resolved Kerr Rotation, TRKR)光谱技术研究了纤锌矿n-CdS(n型掺杂)(0001)面单晶在不同温度、不同波长下的电子自旋相干动力学. 发现低温下该材料存在两种电子自旋信号: 一种是在较长泵浦探测波长下存在的长寿命自旋信号, 低温5 K时其自旋退相位时间长达4.8 ns, 随着温度的升高不断减小; 另一种为较短泵浦探测波长下存在的短寿命自旋信号, 其自旋退相位时间约为40 ps, 可以持续到室温, 该自旋信号几乎不受温度的影响. 研究表明, 长寿命自旋信号来自于局域电子, 而短寿命自旋信号来自于导带自由电子.

关键词： 电子自旋; CdS; 单晶; 泵浦-探测

本文引用格式

郭家兴 , 吴真 , 梁盼 , 姜美珍 , 胡蓉蓉 , 张圆圆 , 冯东海 . CdS晶体电子自旋相干动力学[J]. 华东师范大学学报（自然科学版）, 2021 , 2021(1) : 92 -102 . DOI: 10.3969/j.issn.1000-5641.202022005

Abstract

In this paper, we use time-resolved Kerr rotation(TRKR) spectroscopy to study the electron spin coherence dynamics of a wurtzite (0001) plane n-CdS single crystal at different temperatures and wavelengths. Two types of electronic spin signals are observed in this material at low temperatures. One is a long-lived spin signal at relatively long pump probe wavelengths, where the spin dephasing time exceeds 4.8 ns at 5 K and decreases with increasing temperature. The other is a short-lived spin signal at relatively short pump probe wavelengths, where the spin dephasing time is about 40 ps and persists up to room temperature; in this case, the spin signal is largely independent of temperature. Studies have shown that long-lived spin signals can be attributed to localized electrons, while short-lived spin signals can be attributed to conduction delocalized electrons.

Key words： electron spin; CdS; single crystal; pump-probe

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