A scanning tunneling microscope capable of electron spin resonance and pump-probe spectroscopy at mK temperature and in vector magnetic field

被引:25
|
作者
van Weerdenburg, Werner M. J. [1 ]
Steinbrecher, Manuel [1 ]
van Mullekom, Niels P. E. [1 ]
Gerritsen, Jan W. [1 ]
von Allworden, Henning [1 ]
Natterer, Fabian D. [2 ]
Khajetoorians, Alexander A. [1 ]
机构
[1] Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 AJ Nijmegen, Netherlands
[2] Univ Zurich, Dept Phys, CH-8057 Zurich, Switzerland
来源
REVIEW OF SCIENTIFIC INSTRUMENTS | 2021年 / 92卷 / 03期
基金
瑞士国家科学基金会; 欧洲研究理事会;
关键词
Spin dynamics - Scanning tunneling microscopy - Silver compounds - Magnesia - Electron spin resonance spectroscopy - Pumps - Electrospinning - Magnetic fields - Titanium dioxide;
D O I
10.1063/5.0040011
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
In the last decade, detecting spin dynamics at the atomic scale has been enabled by combining techniques such as electron spin resonance (ESR) or pump-probe spectroscopy with scanning tunneling microscopy (STM). Here, we demonstrate an ultra-high vacuum STM operational at milliKelvin (mK) temperatures and in a vector magnetic field capable of both ESR and pump-probe spectroscopy. By implementing GHz compatible cabling, we achieve appreciable RF amplitudes at the junction while maintaining the mK base temperature and high energy resolution. We demonstrate the successful operation of our setup by utilizing two experimental ESR modes (frequency sweep and magnetic field sweep) on an individual TiH molecule on MgO/Ag(100) and extract the effective g-factor. We trace the ESR transitions down to MHz into an unprecedented low frequency band enabled by the mK base temperature. We also implement an all-electrical pump-probe scheme based on waveform sequencing suited for studying dynamics down to the nanoseconds range. We benchmark our system by detecting the spin relaxation time T-1 of individual Fe atoms on MgO/Ag(100) and note a field strength and orientation dependent relaxation time.
引用
收藏
页数:9
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