scholarly journals Quantum theory of spectral-diffusion-induced electron spin decoherence

2005 ◽  
Vol 72 (16) ◽  
Author(s):  
W. M. Witzel ◽  
Rogerio de Sousa ◽  
S. Das Sarma
Keyword(s):  
Quantum Theory ◽  
Electron Spin ◽  
Spectral Diffusion ◽  
Spin Decoherence

scholarly journals Tuning the spin coherence time of Cu(II)−(bis)oxamato and Cu(II)−(bis)oxamidato complexes by advanced ESR pulse protocols

2017 ◽  
Vol 8 ◽  
pp. 943-955 ◽  
Author(s):  
Ruslan Zaripov ◽  
Evgeniya Vavilova ◽  
Iskander Khairuzhdinov ◽  
Kev Salikhov ◽  
Violeta Voronkova ◽  
...  
Keyword(s):  
Electron Spin ◽  
Pulse Sequence ◽  
Building Blocks ◽  
Esr Spectra ◽  
Host Lattice ◽  
Spectral Diffusion ◽  
Molecular Structures ◽  
Spin Coherence ◽  
Spin Decoherence ◽  
Oxamidato Complexes

We have investigated with the pulsed ESR technique at X- and Q-band frequencies the coherence and relaxation of Cu spins S = 1/2 in single crystals of diamagnetically diluted mononuclear [n-Bu4N]2[Cu(opba)] (1%) in the host lattice of [n-Bu4N]2[Ni(opba)] (99%, opba = o-phenylenebis(oxamato)) and of diamagnetically diluted mononuclear [n-Bu4N]2[Cu(opbon-Pr2)] (1%) in the host lattice of [n-Bu4N]2[Ni(opbon-Pr2)] (99%, opbon-Pr2 = o-phenylenebis(N(propyl)oxamidato)). For that we have measured the electron spin dephasing time T m at different temperatures with the two-pulse primary echo and with the special Carr–Purcell–Meiboom–Gill (CPMG) multiple microwave pulse sequence. Application of the CPMG protocol has led to a substantial increase of the spin coherence lifetime in both complexes as compared to the primary echo results. It shows the efficiency of the suppression of the electron spin decoherence channel in the studied complexes arising due to spectral diffusion induced by a random modulation of the hyperfine interaction with the nuclear spins. We argue that this method can be used as a test for the relevance of the spectral diffusion for the electron spin decoherence. Our results have revealed a prominent role of the opba4– and opbon-Pr2 4– ligands for the dephasing of the Cu spins. The presence of additional 14N nuclei and protons in [Cu(opbon-Pr2)]2– as compared to [Cu(opba)]2– yields significantly shorter T m times. Such a detrimental effect of the opbon-Pr2 4− ligands has to be considered when discussing a potential application of the Cu(II)−(bis)oxamato and Cu(II)−(bis)oxamidato complexes as building blocks of more complex molecular structures in prototype spintronic devices. Furthermore, in our work we propose an improved CPMG pulse protocol that enables elimination of unwanted echoes that inevitably appear in the case of inhomogeneously broadened ESR spectra due to the selective excitation of electron spins.

Electron Spin Decoherence by Nuclei

2018 ◽  
Author(s):  
M. M. Glazov
Keyword(s):  
Electron Spin ◽  
Spin Dynamics ◽  
Magnetic Moments ◽  
Host Lattice ◽  
Spin Model ◽  
Relaxation Processes ◽  
Nuclear Spins ◽  
Model Calculations ◽  
Spin Decoherence ◽  
Quantum Mechanical Approach

The discussion of the electron spin decoherence and relaxation phenomena via the hyperfine interaction with host lattice spins is presented here. The spin relaxation processes processes limit the conservation time of spin states as well as the response time of the spin system to external perturbations. The central spin model, where the spin of charge carrier interacts with the bath of nuclear spins, is formulated. We also present different methods to calculate the spin dynamics within this model. Simple but physically transparent semiclassical treatment where the nuclear spins are considered as largely static classical magnetic moments is followed by more advanced quantum mechanical approach where the feedback of electron spin dynamics on the nuclei is taken into account. The chapter concludes with an overview of experimental data and its comparison with model calculations.

scholarly journals Removing Non-Size-Dependent Electron Spin Decoherence of Nanodiamond Quantum Sensors by Aerobic Oxidation

2019 ◽  
Vol 2 (6) ◽  
pp. 3701-3710 ◽  
Author(s):  
Ryuta Tsukahara ◽  
Masazumi Fujiwara ◽  
Yoshihiko Sera ◽  
Yushi Nishimura ◽  
Yuko Sugai ◽  
...  
Keyword(s):  
Electron Spin ◽  
Aerobic Oxidation ◽  
Size Dependent ◽  
Spin Decoherence
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