Project

Back to overview

Setup for studies of quantum phenomena in condensed matter systems at ultra-low temperatures in magnetic vector fields

English title Setup for studies of quantum phenomena in condensed matter systems at ultra-low temperatures in magnetic vector fields
Applicant Ronnow Henrik M.
Number 133815
Funding scheme R'EQUIP
Research institution Institut de physique de la matière condensée EPFL - SB - ICMP
Institution of higher education EPF Lausanne - EPFL
Main discipline Condensed Matter Physics
Start/End 01.04.2012 - 31.03.2017
Approved amount 250'000.00
Show all

Keywords (13)

quantum phenomena; quantum tunneling; quantum coherence and oscillations; nanomagnetism; Magnetometry; Scanning Probe magnetometry; magnetic pump-probe experiments; ultra-low temperatures; magnetic vector fields; quantum magnetism; spintronics; magnetization dynamics; optomechanical systems

Lay Summary (English)

Lead
Lay summary
Ultra-low temperatures and flexible magnetic fields are at the heart of a range of fascinating research topics in condensed matter physics. With a number of groups at EPFL working in the areas of spintronics, magnetization dynamics, quantum magnetism and optomechanical systems, a joint installation is being set up to fill the needs of these groups.This project will implement a state of the art facility combining ultra-low temperatures and precise directionally controlled magnetic fields for experimental investigations. The setup is devised to be flexible to allow for different types of measurements including low temperature DC and high frequency transport, high sensitivity magnetometry and others.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Publications

Publication
Dimensional Reduction in Quantum Dipolar Antiferromagnets
Babkevich P., Jeong M., Matsumoto Y., Kovacevic I., Finco A., Toft-Petersen R., Ritter C., Mansson M., Nakatsuji S., Ronnow H. M. (2016), Dimensional Reduction in Quantum Dipolar Antiferromagnets, in PHYSICAL REVIEW LETTERS, 116(19), 197202.
One-dimensional quantum magnetism in the anhydrous alum KTi(SO4)(2)
Nilsen G. J., Araja A., Tsirlin A. A., Mutka H., Kasinathan D., Ritter C., Ronnow H. M. (2015), One-dimensional quantum magnetism in the anhydrous alum KTi(SO4)(2), in NEW JOURNAL OF PHYSICS, 17, 113035.
Quantum critical scaling for a Heisenberg spin-1/2 chain around saturation
Jeong M., Ronnow H. M. (2015), Quantum critical scaling for a Heisenberg spin-1/2 chain around saturation, in Phys. Rev. B, 92, 180409.
Sc2Ga2CuO7: A possible quantum spin liquid near the percolation threshold
Kumar R., Khuntia P., Sheptyakov D., Freeman P. G., Ronnow H. M., Koteswararao B., Baenitz M., Jeong M., Mahajan A. V. (2015), Sc2Ga2CuO7: A possible quantum spin liquid near the percolation threshold, in PHYSICAL REVIEW B, 92(18), 180411.
An ultra-low temperature scanning Hall probe microscope for magnetic imaging below 40 mK
Karci Ozgur, Piatek Julian O., Jorba Pau, Dede Munir, Ronnow Henrik M., Oral Ahmet (2014), An ultra-low temperature scanning Hall probe microscope for magnetic imaging below 40 mK, in REVIEW OF SCIENTIFIC INSTRUMENTS, 85(10), 103703.
Nonequilibrium hysteresis and spin relaxation in the mixed-anisotropy dipolar-coupled spin-glass LiHo0.5Er0.5F4
Piatek J. O., Kovacevic I., Babkevich P., Piazza B. Dalla, Neithardt S., Gavilano J., Kraemer K. W., Ronnow H. M. (2014), Nonequilibrium hysteresis and spin relaxation in the mixed-anisotropy dipolar-coupled spin-glass LiHo0.5Er0.5F4, in PHYSICAL REVIEW B, 90(17), 174427.
Electronic structure of KTi(SO4)(2)center dot H2O: An S=1/2 frustrated chain antiferromagnet
Kasinathan Deepa, Koepernik K., Janson O., Nilsen G. J., Piatek J. O., Ronnow H. M., Rosner H. (2013), Electronic structure of KTi(SO4)(2)center dot H2O: An S=1/2 frustrated chain antiferromagnet, in PHYSICAL REVIEW B, 88(22), 224410.
Low-temperature spin dynamics of a valence bond glass in Ba2YMoO6
de Vries M. A., Piatek J. O., Misek M., Lord J. S., Ronnow H. M., Bos J-W G. (2013), Low-temperature spin dynamics of a valence bond glass in Ba2YMoO6, in NEW JOURNAL OF PHYSICS, 15, 043024.
Phase diagram with an enhanced spin-glass region of the mixed Ising-XY magnet LiHoxEr1-xF4
Piatek J. O., Dalla Piazza B., Nikseresht N., Tsyrulin N., Zivkovic I., Kraemer K. W., Laver M., Prokes K., Matas S., Christensen N. B., Ronnow H. M. (2013), Phase diagram with an enhanced spin-glass region of the mixed Ising-XY magnet LiHoxEr1-xF4, in PHYSICAL REVIEW B, 88(1), 014408.
Dipolar Antiferromagnetism and Quantum Criticality in LiErF4
Kraemer Conradin, Nikseresht Neda, Piatek Julian O., Tsyrulin Nikolay, Dalla Piazza Bastien, Kiefer Klaus, Klemke Bastian, Rosenbaum Thomas F., Aeppli Gabriel, Gannarelli Che, Prokes Karel, Podlesnyak Andrey, Straessle Thierry, Keller Lukas, Zaharko Oksana, Kraemer Karl W., Ronnow Henrik M. (2012), Dipolar Antiferromagnetism and Quantum Criticality in LiErF4, in SCIENCE, 336(6087), 1416-1419.

Collaboration

Group / person Country
Types of collaboration
London Centre for Nanotechnology Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
- Exchange of personnel
R. Lortz, University of Hong Kong Hongkong (Asia)
- in-depth/constructive exchanges on approaches, methods or results
- Exchange of personnel
Institut Laue Langevin, France France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
Copenhagen University Denmark (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
- Exchange of personnel
K. Kraemer, Uni Bern Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
ICMP, EPFL Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Awards

Title Year
Julian Piatek from Laboratory of Quantum Magnetism has received special honorary mention at the 2012 DuPont Kevlar Innovation Award. A key challenge in working at ultra-low temperatures is to have a rigid mechanical connection with as low a thermal conductivity as possible. The invention by LQM's PhD student Julian Piatek offers a simple yet powerful solution constructed by kevlar threads. 2012

Associated projects

Number Title Start Funding scheme
166271 Nonlinear Probes of quantum localized systems 01.03.2017 Project funding (Div. I-III)
121898 Dimer Physics - from new Quantum Phases to Superconductivity 01.01.2009 Project funding (Div. I-III)
129720 Dynamics of domain walls and magnetic topological solitons 01.06.2010 Project funding (Div. I-III)
166298 Quantum Magnetism - Checkerboards, Skyrmions and Dipoles 01.06.2016 Project funding (Div. I-III)
162110 Harnessing Molecular Crystals for Quantum Magnets and Elucidating Quantum Critical Physics 01.03.2016 Bilateral programmes
121397 Sub-Kelvin high sensitivity magnetometer for magnetic materials exploration 01.07.2008 R'EQUIP
130522 Quantum Magnetism - Dimer Physics and Dipolar Criticality 01.04.2010 Project funding (Div. I-III)
116590 From Quantum Phase transitions to Addressable Spin Clusters 01.04.2007 Project funding (Div. I-III)
144972 High efficiency neutron spectrometer optimized for investigations under extreme conditions 01.01.2014 R'EQUIP
146870 Quantum Magnetism - Spinons, Skyrmions and Dipoles 01.04.2013 Project funding (Div. I-III)
141962 Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials 01.01.2013 Sinergia
117817 Magnetic excitations in novel metal-organic quantum materials and molecular magnets 01.01.2008 Project funding (Div. I-III)

Abstract

This proposal aims at acquiring a state of the art low-temperature facility (dilution refrigerator) specifically equipped to provide high cooling power (400microW) with ultra-low base temperature below 10mK, in combination with a specially designed high field superconducting vector-cryomagnet with unmatched field stability and accuracy. The applicant group is formed by 3 new professors at EPFL focusing on different activities at the forefronts of the overarching topic of quantum functionality in condensed matter: M. Kläui (Laboratory of Nanomagnetism and Spin Dynamics), H. M. Ronnow (Laboratory for Quantum Magnetism) and T. Kippenberg (Laboratory of Photonics and Quantum Measurements). In addition to the scientific synergies, which have been strengthened by the formation of the new Institute of Condensed Matter Physics, our activities share common infrastructure needs - most notably measurements in magnetic fields at ultra-low temperatures.Scientifically, a strong emphasis will be put on macroscopic quantum effects occurring in magnetic systems and we will study in particular the transition from classical spin dynamics to quantum tunnelling of domain walls. By correlating the tunnelling parameters and geometry as well as the wall spin structure, key information about magnetic properties, the potential landscape, and the dissipation channels will be ascertained. Beyond tunnelling we will study macroscopic quantum coherence effects, such as Bloch oscillations of domain walls occurring at mK temperatures in superlattices. Magnetic edge states will be probed in graphene nanostructures synthesized by a bottom-up chemical approach. We will study the effects on the spin transport, possible half-metallic behaviour and eventually use such nanoribbons for qubits.Bulk quantum magnets will be studied along 3 main directions: i) exploration of new model materials with novel quantum phases; ii) high precision studies of quantum phase transitions, and iii) magnetic pump-probe type measurements of non-equilibrium properties. The latter will address the surge of theoretical interest in so-called quantum quenches. While technically very challenging, it can open the gates to a new paradigm of experiments in quantum magnetism.Finally, the third applicant is among the world leaders in the new field of cavity optomechanics, which studies the coupling of light to mechanical degrees of freedom. This coupling has allowed to achieve measurements at the quantum limit of mechanical motion. The high cooling power low base-temperature system will allow to pursue the enigmatic goal of ground state cooling a microscopic system.In addition to serving the applicants’ research programs, the competitive temperature-field range combined with several advanced measurement possibilities including high frequencies and high pressures will make it a unique attraction welcoming collaborating groups from within Switzerland and beyond.
-