用四个电触点同时测量载流子密度、迁移率及其瞬态：频率复用霍尔效应方法

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-06-20 DOI:10.1063/5.0272113

Can C. Aygen, Christopher Cravey, Jiajun Luo, James Williams, D. Bruce Buchholz, David R. Daughton, Christian Reichl, Werner Wegscheider, Matthew A. Grayson

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引用次数: 0

摘要

频率复用霍尔效应法（FMHM）仅使用四个电触点即可同时测量任意形状样品中随时间变化的霍尔Rxy(t)和纵向电阻Rxx(t)。FMHM应用Onsager互易关系以及三个独立的电流源和三个锁相放大器在三个不同的频率。瞬态FMHM测量固定磁场B下德鲁德极限下Rxx(t)和Rxy(t)随时间变化的样品，参数FMHM测量Rxx[A(t)]和Rxy[A(t)]，其中A(t)是一个随时间变化的控制参数，如B(t)或温度t (t)。在固定磁场B的Drude区，用FMHM测量了GaN/AlGaN二维电子体系和Zn0.3In1.4Sn0.3O3非晶态氧化薄膜上的瞬时光电性n(t)和μ(t)。参数FMHM在Drude体系中用于研究持续光电性n(T)和μ(T)的温度依赖性，在量子Hall体系中用于研究GaAs量子阱中Rxx(B)和Rxy(B)的磁场依赖性。

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Simultaneous measurement of charge carrier density, mobility, and their transients with four electrical contacts: Frequency-multiplexed Hall effect method

The frequency multiplexed Hall effect method (FMHM) simultaneously measures time-dependent Hall Rxy(t) and longitudinal resistance Rxx(t) in arbitrary shaped samples using only four electrical contacts. FMHM applies the Onsager reciprocity relations along with three independent current sources and three lock-in amplifiers at three different frequencies. Transient FMHM measures samples with time-dependent Rxx(t) and Rxy(t) in the Drude limit at fixed magnetic field B. Parametric FMHM measures Rxx[A(t)] and Rxy[A(t)], where A(t) is an time-dependent control parameter such as B(t) or temperature T(t). Transient FMHM is demonstrated in the Drude regime at fixed magnetic field B to measure photoconductivity transients n(t) and μ(t) in GaN/AlGaN two-dimensional electron systems and on Zn0.3In1.4Sn0.3O3 amorphous oxide thin films. Parametric FMHM is demonstrated both in the Drude regime to study the temperature dependence of persistent photoconductivity n(T) and μ(T) and in the quantum Hall regime to study the magnetic-field dependence of Rxx(B) and Rxy(B) in GaAs quantum wells.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.