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Fermionic quasiparticles caught slowly disappearing for the first time – Physics World

Fermionic quasiparticles caught slowly disappearing for the first time – Physics World
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Nordrhein westfalenShovon palManfred fiebigUniversity of bonnNature physics

When electrons slowly vanish during cooling

Many substances change their properties when they are cooled below a certain critical temperature. Such a phase transition occurs, for example, when water freezes. However, in certain metals there .

Nordrhein westfalenHans krohaShovon palManfred fiebigCornelius krellnerJohann krohaChia jung yangKristin kliemtTransdisciplinary research area matterUniversity of bonnBethe centerTheoretical physicsTransdisciplinary research areaGerman researchJung yangPhase transitions

When electrons slowly vanish during cooling

Many substances change their properties when they are cooled below a certain critical temperature. Such a phase transition occurs, for example, when water freezes. However, in certain metals there are phase transitions that do not exist in the macrocosm. They arise because of the special laws of quantum mechanics that apply in the realm of nature’s smallest building blocks. It is thought that the concept of electrons as carriers of quantized electric charge no longer applies near these exotic phase transitions. Researchers at the University of Bonn and ETH Zurich have now found a way to prove this directly. Their findings allow new insights into the exotic world of quantum physics. The publication has now been released in the journal Nature Physics.

Nordrhein westfalenShovon palKristin kliemtManfred fiebigChia jung yangHans krohaCornelius krellnerJohann krohaInstitute of physicsBethe centerTransdisciplinary research area matterUniversity of bonnGerman research foundationSwiss national science foundationMethod of researchTheoretical physics

When Functional Materials Become Squishy

Date Time When Functional Materials Become Squishy Most people associate terahertz radiation from airport scanners. These radiations can, however, unleash a bag full of surprises when used to interrogate novel materials. An international team of researchers from the Department of Materials in ETH Zurich and Max-Born-Institute in Berlin joined hands to unravel a very fundamental question on the origin of nonlinearities of a characteristic vibrational mode that becomes soft and squishy when approaching towards the phase transition. In functional materials, we want to have novel effects as large and new as possible with perturbations as small as possible. Though seemingly contradictory, such a requirement can be met by taking the material close to a phase transition, where the material becomes unstable and nonlinear in some form. In ferroelectric materials, for example, a certain vibrational mode becomes “soft” near the phase transition; that is, the frequency of the mode decreas

Manfred fiebigChia jung yangMorgan trassinNives strkaljShovon palMichael woernerDepartment of materialsTerahertz soft mode nonlinearitiesFerroelectric perovskitesEth zurichம்யாந்ஃப்ரெட் பிஎபிக்மைக்கேல் வொஏர்னேற்துறை ஆஃப் பொருட்கள்எத் ஸுரி