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TRR 288:  Elastic Tuning and Response of Electronic Quantum Phases of Matter (ELASTO-Q-MAT)

Subject Area Physics
Term since 2020
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Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 422213477
 
Quantum materials are systems designed to showcase novel and often exotic electronic, magnetic, or optical properties arising from quantum mechanical phenomena at the atomic or subatomic level. Research on quantum materials is motivated by the potential for groundbreaking discoveries and transformative applications. Examples are novel superconductors, quantum magnets, quantum spin liquids, electronic nematics, and topological materials. Within the TRR we have developed innovative experimental techniques that enable precise strain tuning and the measurement of various physical properties, both at the world’s premier large-scale research facilities and University laboratories. Our approach allows us to manipulate material properties in ways chemistry alone cannot achieve. It has led to groundbreaking discoveries, such as novel states of matter like nematic quantum liquids, altermagnets, superelasticity, and unique nonlinear electron-lattice interactions in unconventional superconductors. Our development of novel experimental methods, such as the AC-elastocaloric effect under stress, magnetic circular dichroism in time-of-flight momentum microscopy, and scanning micro-Raman spectroscopy, provides unprecedented insights to uncover the often well-hidden secrets of quantum materials. Our forward-looking approach is to exploit and showcase - for a well-defined set of quantum materials - the intrinsic connection between correlated-electron dynamics and lattice dynamics. The long-term goals of the TRR are i) to develop a systematic understanding of physical phenomena that are the result of a strong coupling between electronic orders and the crystalline lattice, over a wide range of time- and length scales, ii) to design, understand, and advance electronic quantum materials with exceptional mechanical responsiveness, and iii) to explore the potential of such interacting systems to create new functionalities that enable or facilitate interfacing between mechanical and electronic properties. To formulate the concrete objectives, we will build upon breakthrough results and address a specific set of open problems. We propose to: 1) Advance the understanding of altermagnetism as a new class of magnetic d-, g- and i-wave order with strong elastic coupling and extremely promising spin transport properties. 2) Advance the identification of novel strain-tuned instabilities such as charge- and spin-density waves, ordered magnetism and spin liquids, and particularly the connection between first-principles theory and their experimental characterization. 3) Explore the many-body density of states of quantum materials using the elastocaloric effect. 4) Exploit super-elasticity with large maximum recoverable strain to design new materials with functional properties such as efficient elastocaloric cooling capabilities. 5) Explore spectroscopically and theoretically the coherent dynamics of strong local fluctuations that occur in states like nematic liquids.
DFG Programme CRC/Transregios

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Participating University Ruhr-Universität Bochum
 
 

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