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Quantum effect fingerprint

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In solid-state physics, the exact interactions of electrons are analyzed through in-depth detective work, ultimately giving a better understanding of the underlying physical phenomena.


For fans of the thriller genre, it’s no wonder that fingerprints must be carefully placed at the crime scene to resolve the case. In modern solid-state physics, scientists look for scattering processes (electron interactions) that hold the clues needed to get closer to the truth.

Revealing these important hints is especially difficult for complex materials in which many electrons play a role at the same time. In so-called “multi-electron systems,” trillions of electrons can be connected to each other to exchange energy and momentum. At the Vienna University of Technology, the University of Tübingen, and the Ecole Polytechnic in Paris, researchers have made significant progress. A new structure has been identified with the help of accurate analysis. The characteristic pattern of complex scattering processes helps to “clear”. Case. “

Scattering process and material properties

Among other properties, the scattering process determines the mobility of charge carriers and controls whether the system ultimately exhibits metal, insulation, or superconducting behavior. Simply put, these mathematical quantities reflect how strongly the electrons interact. Condensed matter physics researchers, with the help of extensive computer simulations, have identified the physical properties of multi-electron systems and ultimately solid-state physics such as “how unconventional superconductors work”. Try to answer the basic questions of physics. Or “How does the quantum physical phase transition occur at absolute zero?”

International research teams, including Professor Alessandro Toschi of the Vienna University of Technology (Patrick Chalupa, Matthias Reitner und Daniel Springer), Professor Sabine Andergassen of the University of Tubingen, and Thomas Schäfer of the Ecole Institute of Technology in Paris, are on this point. A detailed analysis of the scattering process and their comparison in different physical situations has enabled clear identification of “fingerprints”.The results of the study were published in the journal Physical review letter..

New connection revealed

Like forensic scientists at crime scenes, researchers tried to connect many details to get the big picture. They have identified characteristic structures of complex mathematical quantities that explain the scattering process and have succeeded in associating these structures with two basic phenomena in solid-state physics. It turns out that these basic phenomena are the formation of local magnetic moments and their screening by the so-called Kondo effect. Both of these decisively control the mobility of electrons. With this new connection, you can see at a glance the relevant physical effects in a complex scattering process. By identifying these “fingerprints”, it was even possible to discover alternative criteria for determining Kondo temperature, one of the most basic energy scales in theoretical solid-state physics.

Ultimately, these discoveries are unsolved mysteries in solid-state physics, such as quantum criticality in heavy fermion systems, unconventional superconductivity in strongly correlated quantum materials, and amazing magnetism in transition metal oxides. You can shed new light on the phenomenon. By correctly determining the underlying quantum fingerprints, these systems can be put on the right track for understanding at a basic level.


Sticky electrons: when repulsion turns into attractive force


For more information:
P. Chalupa et al. Fingerprint of local moment formation and its Kondo screening in the generalized sensitivity of multi-electron problems, Physical review letter (2021). DOI: 10.1103 / PhysRevLett.126.056403

Provided by Vienna University of Technology

Quote: CSI Solid-State: https: //phys.org/news/2021-02-csi-solid-state-fingerprints-quantum-effects.html Quantum effects (2021, 2) obtained on February 19, 2021 19th) Fingerprint

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