Project

Back to overview

Quantum Coherence in Nanoscale Systems

English title Quantum Coherence in Nanoscale Systems
Applicant Zumbühl Dominik
Number 179024
Funding scheme Project funding (Div. I-III)
Research institution Departement Physik Universität Basel
Institution of higher education University of Basel - BS
Main discipline Condensed Matter Physics
Start/End 01.04.2018 - 31.03.2022
Approved amount 1'496'827.00
Show all

Keywords (8)

experimental condensed matter physics; nuclear demagnetization cooling; quantum wires; semiconductor spins; spin qubits; nanophysics; ultralow temperature physics; edge states and topological insulators

Lay Summary (German)

Lead
Die Quantenphysik wurde zwar schon vor über hundert Jahren entwickelt, allerdings ist es erst in jüngster Zeit, dass wir die Möglichkeiten in Händen halten um einzelne Quantensysteme im Labor zu untersuchen, zu verstehen, und kontrolliert zu manipulieren. Dies öffnet uns die Türen zur fundamentalen Studie der Gesetze der Quantenmechanik, z. B. in nanostrukturierten Proben, und legt das Fundament für zukünftige Quantentechnologien wie Quantencomputing und neue Quantenmaterialien. Die experimentelle Realisierung neuer Quantenzustände in Nanosystemen - mit dem Potenzial zukünftig als Qubits zu fungieren - und die Erforschung der zugrundeliegenden Physik gehört zu den spannendsten und aktivsten Forschungsgebieten der heutigen Festkörperphysik.
Lay summary

Zahlreiche Arbeitsgruppen arbeiten weltweit daran, mit Hightech-Kühlschränken Temperaturen möglichst nahe am absoluten Nullpunkt zu erreichen. Dieser liegt bei 0 Kelvin oder −273,15 °C. Für Physiker ist es erstrebenswert ihre Apparaturen soweit abzukühlen, dass sie diesem Kältemaximum möglichst nahekommen, da diese extrem tiefen Temperaturen ideale Bedingungen für Quantenexperimente bieten und sich ganz neue physikalische Phänomene untersuchen lassen. Das Prinzip der magnetischen Kühlung kann auch in der Nanoelektronik eingesetzt werden um damit Nanoelektronik Geräte auf Temperaturen nahe dem absoluten Nullpunkt abzukühlen. In diesem Projekt wollen wir Temperaturen unter 1 mK in Nanoelektronischen Schaltkreisen erreichen.

Bei solch tiefen Temperaturen lassen sich auch stabilere Quanten Bits, kurz Qubits, realisieren, die als Informationseinheit eines zukünftigen Quantencomputers dienen. Wir untersuchen solche Qubits in Halbleitermaterialien und untersuchen sie auf Ihre Stabilität und wie geeignet sie für Quantenrechner sind. Ausserdem untersuchen wir neuartige topologische Randzustände mit Hilfe von Quantendrähten.


Direct link to Lay Summary Last update: 05.04.2018

Responsible applicant and co-applicants

Employees

Publications

Publication
Symmetry breaking of the persistent spin helix in quantum transport
Weigele Pirmin J., Marinescu D. C., Dettwiler Florian, Fu Jiyong, Mack Shawn, Egues J. Carlos, Awschalom David D., Zumbühl Dominik M. (2020), Symmetry breaking of the persistent spin helix in quantum transport, in Physical Review B, 101(3), 035414-035414.
Efficiently measuring a quantum device using machine learning
Lennon D. T., Moon H., Camenzind L. C., Yu Liuqi, Zumbühl D. M., Briggs G. A .D., Osborne M. A., Laird E. A., Ares N. (2019), Efficiently measuring a quantum device using machine learning, in npj Quantum Information, 5(1), 79-79.
Characterization of hydrogen plasma defined graphene edges
Rehmann Mirko K., Kalyoncu Yemliha B., Kisiel Marcin, Pascher Nikola, Giessibl Franz J., Müller Fabian, Watanabe Kenji, Taniguchi Takashi, Meyer Ernst, Liu Ming-Hao, Zumbühl Dominik M. (2019), Characterization of hydrogen plasma defined graphene edges, in Carbon, 150, 417-424.
Spectroscopy of Quantum Dot Orbitals with In-Plane Magnetic Fields
Camenzind Leon C., Yu Liuqi, Stano Peter, Zimmerman Jeramy D., Gossard Arthur C., Loss Daniel, Zumbühl Dominik M. (2019), Spectroscopy of Quantum Dot Orbitals with In-Plane Magnetic Fields, in Physical Review Letters, 122(20), 207701-207701.
Closed-Form Weak Localization Magnetoconductivity in Quantum Wells with Arbitrary Rashba and Dresselhaus Spin-Orbit Interactions
Marinescu D. C., Weigele Pirmin J., Zumbühl Dominik M., Egues J. Carlos (2019), Closed-Form Weak Localization Magnetoconductivity in Quantum Wells with Arbitrary Rashba and Dresselhaus Spin-Orbit Interactions, in Physical Review Letters, 122(15), 156601-156601.
Orbital effects of a strong in-plane magnetic field on a gate-defined quantum dot
Stano Peter, Hsu Chen-Hsuan, Camenzind Leon C., Yu Liuqi, Zumbühl Dominik, Loss Daniel (2019), Orbital effects of a strong in-plane magnetic field on a gate-defined quantum dot, in Physical Review B, 99(8), 085308-085308.
Hyperfine-phonon spin relaxation in a single-electron GaAs quantum dot
Camenzind Leon C., Yu Liuqi, Stano Peter, Zimmerman Jeramy D., Gossard Arthur C., Loss Daniel, Zumbühl Dominik M. (2018), Hyperfine-phonon spin relaxation in a single-electron GaAs quantum dot, in Nature Communications, 9(1), 3454-3454.
Evolution of the quantum Hall bulk spectrum into chiral edge states
Patlatiuk T., Scheller C. P., Hill D., Tserkovnyak Y., Barak G., Yacoby A., Pfeiffer L. N., West K. W., Zumbühl D. M. (2018), Evolution of the quantum Hall bulk spectrum into chiral edge states, in Nature Communications, 9(1), 3692-3692.
g -factor of electrons in gate-defined quantum dots in a strong in-plane magnetic field
Stano Peter, Hsu Chen-Hsuan, Serina Marcel, Camenzind Leon C., Zumbühl Dominik M., Loss Daniel (2018), g -factor of electrons in gate-defined quantum dots in a strong in-plane magnetic field, in Physical Review B, 98(19), 195314-195314.
Ambipolar quantum dots in undoped silicon fin field-effect transistors
Kuhlmann Andreas V., Deshpande Veeresh, Camenzind Leon C., Zumbühl Dominik M., Fuhrer Andreas (2018), Ambipolar quantum dots in undoped silicon fin field-effect transistors, in Applied Physics Letters, 113(12), 122107-122107.
Single, double, and triple quantum dots in Ge/Si nanowires
Froning F. N. M., Rehmann M. K., Ridderbos J., Brauns M., Zwanenburg F. A., Li A., Bakkers E. P. A. M., Zumbühl D. M., Braakman F. R. (2018), Single, double, and triple quantum dots in Ge/Si nanowires, in Applied Physics Letters, 113(7), 073102-073102.
Template-Assisted Scalable Nanowire Networks
Friedl Martin, Cerveny Kris, Weigele Pirmin, Tütüncüoglu Gozde, Martí-Sánchez Sara, Huang Chunyi, Patlatiuk Taras, Potts Heidi, Sun Zhiyuan, Hill Megan O., Güniat Lucas, Kim Wonjong, Zamani Mahdi, Dubrovskii Vladimir G., Arbiol Jordi, Lauhon Lincoln J., Zumbühl Dominik M., Fontcuberta i Morral Anna (2018), Template-Assisted Scalable Nanowire Networks, in Nano Letters, 18(4), 2666-2671.

Collaboration

Group / person Country
Types of collaboration
Prof. Dr. Jose Carlos Egues, University of Sao Paulo, Brazil Brazil (South America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Prof. Dr. Ilaria Zardo, University of Basel Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
European Microkelvin Platform EMP Finland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
- Industry/business/other use-inspired collaboration
Prof. Dr. Amir Yacoby, Harvard University, Cambridge, MA United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
NCCR Quantum Science and Technology QSIT Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
- Industry/business/other use-inspired collaboration
Prof. Dr. Christian Schönenberger, University of Basel Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Prof. Dr. Jelena Klinovaja, University of Basel Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Prof. Dr. Anna Fontcuberta i Morral, EPFL Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
Prof. Dr. Art Gossart, UCSB, Santa Barbara, California United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. Dr. Daniel Loss, University of Basel Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Dr. Loren Pfeiffer, Princeton University United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. Dr. Werner Wegscheider, ETHZ Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Condensed Matter Physics Seminar, Weizmann Institute of Science Individual talk Spins and their Orbits in GaAs Quantum Dots 27.11.2019 Rehovot, Israel, Israel Zumbühl Dominik;
Physicw Colloquium, The Hebrew University of Jerusalem, Israel Individual talk Spins and their Orbits in GaAs Quantum Dots 25.11.2019 Jerusalem, Israel Zumbühl Dominik;
2D Materials: from Fundamentals to Spintronics Talk given at a conference Edge State Spectroscopy with a Quantum Wire and Graphene Edges 01.10.2019 Natal, Brazil Zumbühl Dominik;
International advanced school on low and ultra-low temperature physics Talk given at a conference Lectures on 2D gases and semiconductor nanostructures 13.09.2019 Zemplinska Sirava and Kosice, Slovakia, Slovakia Zumbühl Dominik;
Spins in a Quantum 1D Multi-Particle Environment Talk given at a conference Edge State Spectroscopy with a GaAs Quantum Wire 03.09.2019 LMU Munich, Germany Zumbühl Dominik;
Quantum Designer Physics 2019 Talk given at a conference Spectroscopy of Quantum Dot Orbitals with In-Plane Magnetic Fields 02.07.2019 San Sebastian, Spain Zumbühl Dominik;
Spin Canada 2019 Talk given at a conference Spins and Orbits in GaAs Quantum Dots 24.06.2019 Montebello, Canada Zumbühl Dominik;
1D Systems for Quantum Technology, 700. WE-Heraeus Seminar Talk given at a conference Edge State Spectroscopy with a GaAs Quantum Wire 16.06.2019 Bad Honnef, Germany Patlatiuk Taras; Zumbühl Dominik;
Institute of Physics workshop "Cooling Electrons below 1 mK for Novel Physics" Talk given at a conference On-and-off chip magnetic cooling for nanoelectronics below 1 mK 19.09.2018 Cardiff, Wales, UK, Great Britain and Northern Ireland Zumbühl Dominik;
4th School and Conference on Spin-Based Quantum Information Processing Talk given at a conference Spin Relaxation, Orbital Spectroscopy and g-Factors of GaAs Spins 14.09.2018 Konstanz, Germany Froning Florian; Carballido Miguel; Camenzind Leon; Patlatiuk Taras; Zumbühl Dominik; Braakman Floris Rembrandt; Rehmann Mirko;
Quantum Designer Physics 2018 Talk given at a conference Spins and Orbits in Semiconductor Nanostructures 17.07.2018 San Sebastian, Spain Zumbühl Dominik;
APS March Meeting Los Angeles Talk given at a conference Stretching and Breaking the Persistent Spin Helix 05.04.2018 Los Angeles, United States of America Carballido Miguel; Zumbühl Dominik; Camenzind Leon; Froning Florian; Patlatiuk Taras; Braakman Floris Rembrandt; Rehmann Mirko;


Communication with the public

Communication Title Media Place Year
Talks/events/exhibitions Primarschule Hutten, Blitz, Donner, und Generatoren, Schulstunde 3. Klasse, mit Experimenten. German-speaking Switzerland 2020
Talks/events/exhibitions TecDay Romanshorn, Der Quantencomputer - Superrechner der Zukunft? Western Switzerland German-speaking Switzerland 2020
Talks/events/exhibitions Physics Show and Experiments, Technik und Naturwissenschaften Basel, MuBa. German-speaking Switzerland 2019
Talks/events/exhibitions TecDay Trogen, Der Quantencomputer - Superrechner der Zukunft? German-speaking Switzerland 2019
Media relations: radio, television Wissenschaftsmagazin, radio SRF2 SRF2 German-speaking Switzerland 2019
Talks/events/exhibitions Young Physicists Forum 2019, Quantum Information German-speaking Switzerland Western Switzerland Italian-speaking Switzerland 2019
Talks/events/exhibitions Saturday University, Sissach, Nanoelektronik für den Quantencomputer German-speaking Switzerland 2018
Talks/events/exhibitions TecDay Kanti Olten, Der Quantencomputer - Superrechner der Zukunft? German-speaking Switzerland Western Switzerland 2018
Talks/events/exhibitions Visit of Gym Muttenz at Physics Department, "Der Quantencomputer: Superrechner der Zukunft" German-speaking Switzerland 2018

Associated projects

Number Title Start Funding scheme
157213 Quantum Coherence in Nanoscale Systems 01.10.2014 Project funding (Div. I-III)

Abstract

This proposal describes work on three related projects, outlined below: microkelvin nanoelectronics, tunneling spectroscopy in quantum wires, and spin qubits.Ultralow temperatures below 1 mK in electronic transport experiments can open the door to novel quantum states of matter and boost quantum coherence e.g. in qubits or Majorana devices. Over the past years, our group in Basel has developed a new technique of cooling nanoelectronic devices to ultralow temperatures: we have adapted the well established technique of adiabatic nuclear demagnetization to the specific needs of quantum transport experiments. We have recently demonstrated 150 microK in the nuclear refrigerators, and currently hold the records for the lowest temperatures in both tunnel junction thermometers as well as Coulomb blockade thermometers. After years of efforts, breaking of the 1 mK barrier is imminent, and in this proposal, we are describing our proposed routes down to 1 mK and below. In recent experiments, we have used cleaved edge overgrowth GaAs quantum wires to develop momentum-resolved tunneling spectroscopy. This allows us to probe the evolution of the chiral quantum Hall edge states with unprecedented resolution down to 1 nm, ranging from very low magnetic fields all the way to high fields where depopulation occurs. In this proposal, we will employ and modify the tunneling spectroscopy to probe a broad range of fascinating effects including fractional quantum Hall states, exchange enhanced spin splitting and edge state separation, edge state reconstruction upon depopulation, and Fermi level pinning. Finally, this technique could be modified slightly to be useful to study edge states in other materials such as graphene or transition metal dichalcogenides, or for the study of quantum wires themselves. Finally, we propose to study spin qubits in Ge/Si quantum wires and gate defined GaAs quantum dots. With the piezo-electric rotator which is operating in our cryostat, numerous new possibilities are opening up for applying strong magnetic fields up to 14 T in any direction in a 2D plane. Using our advance spectroscopy methods, we will measure the g-factor anisotropy and spin tunneling asymmetry, and compare it to model predictions. Much larger Rabi frequencies than before are expected when using an optimized spin-orbit configuration, which we will test in experiments. In Ge/Si qubits, we propose the a path from forming repeatable gate defined quantum dots in these wires, to electrical control of the very strong SO coupling. The strength of this SO coupling can be tuned using side gates. Finally, we propose electric-dipole spin resonance experiments in these wires, which are predicted to give very fast Rabi frequencies.
-