Probing quantum coherence in single-atom electron spin resonance
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Título: | Probing quantum coherence in single-atom electron spin resonance |
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Autor/es: | Willke, Philip | Paul, William | Natterer, Fabian D. | Yang, Kai | Bae, Yujeong | Choi, Taeyoung | Fernández-Rossier, Joaquín | Heinrich, Andreas J. | Lutz, Christoper P. |
Grupo/s de investigación o GITE: | Grupo de Nanofísica |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física Aplicada |
Palabras clave: | Quantum coherence | Single-atom electron | Spin resonance |
Área/s de conocimiento: | Física de la Materia Condensada |
Fecha de publicación: | 16-feb-2018 |
Editor: | American Association for the Advancement of Science |
Cita bibliográfica: | Science Advances. 2018, 4(2): eaaq1543. doi:10.1126/sciadv.aaq1543 |
Resumen: | Spin resonance of individual spin centers allows applications ranging from quantum information technology to atomic-scale magnetometry. To protect the quantum properties of a spin, control over its local environment, including energy relaxation and decoherence processes, is crucial. However, in most existing architectures, the environment remains fixed by the crystal structure and electrical contacts. Recently, spin-polarized scanning tunneling microscopy (STM), in combination with electron spin resonance (ESR), allowed the study of single adatoms and inter-atomic coupling with an unprecedented combination of spatial and energy resolution. We elucidate and control the interplay of an Fe single spin with its atomic-scale environment by precisely tuning the phase coherence time T2 using the STM tip as a variable electrode. We find that the decoherence rate is the sum of two main contributions. The first scales linearly with tunnel current and shows that, on average, every tunneling electron causes one dephasing event. The second, effective even without current, arises from thermally activated spin-flip processes of tip spins. Understanding these interactions allows us to maximize T2 and improve the energy resolution. It also allows us to maximize the amplitude of the ESR signal, which supports measurements even at elevated temperatures as high as 4 K. Thus, ESR-STM allows control of quantum coherence in individual, electrically accessible spins. |
Patrocinador/es: | We acknowledge financial support from the Office of Naval Research. P.W. acknowledges financial support from the German academic exchange service. P.W., Y.B., and A.J.H. acknowledge support from the Institute for Basic Science under grant IBS-R027-D1. F.D.N. appreciates support from the Swiss National Science Foundation under project number PZ00P2_167965. W.P. thanks the Natural Sciences and Engineering Research Council of Canada for fellowship support. J.F.-R. thanks National Funds through Fundação para a Ciência e a Tecnologia, under project no. PTDC/FIS-NAN/4662/2014 (016656). |
URI: | http://hdl.handle.net/10045/74488 |
ISSN: | 2375-2548 |
DOI: | 10.1126/sciadv.aaq1543 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1126/sciadv.aaq1543 |
Aparece en las colecciones: | INV - Grupo de Nanofísica - Artículos de Revistas |
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