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Yamabayashi T, Horii Y, Li ZY, Yamashita M. Magnetic Relaxations of Chromium Nitride Porphyrinato Complexes Driven by the Anisotropic g-Factor. Chemistry 2024; 30:e202303082. [PMID: 37880199 DOI: 10.1002/chem.202303082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 10/20/2023] [Accepted: 10/25/2023] [Indexed: 10/27/2023]
Abstract
Molecule-based magnetic materials are useful candidates as the spin qubit due to their long coherence time and high designability. The anisotropy of the g-values of the metal complexes can be utilized to access the individual spin of the metal complexes, making it possible to achieve the scalable molecular spin qubit. For this goal, it is important to evaluate the effect of g-value anisotropy on the magnetic relaxation behaviour. This study reports the slow magnetic relaxation behaviour of chromium nitride (CrN2+ ) porphyrinato complex (1), which is structurally and magnetically similar with the vanadyl (VO2+ ) porphyrinato complex (2) which is known as the excellent spin qubit. Detailed analyses for vibrational and dynamical magnetism of 1 and 2 revealed that g-value anisotropy accelerates magnetic relaxations greater than the internal magnetic field from nuclear spin does. These results provide a design criterion for construction of multiple spin qubit based on g-tensor engineering.
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Affiliation(s)
- Tsutomu Yamabayashi
- Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba Aoba-ku, Sendai, Miyagi, 980-8578, Japan
| | - Yoji Horii
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara, 630-8506, Japan
| | - Zhao-Yang Li
- School of Materials Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Masahiro Yamashita
- Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba Aoba-ku, Sendai, Miyagi, 980-8578, Japan
- School of Chemical Science and Engineering, Tongji University, Siping Road 1239, Shanghai, 200092, P. R. China
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2
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Krishnan R, Biswas S, Hsueh YL, Ma H, Rahman R, Weber B. Spin-Valley Locking for In-Gap Quantum Dots in a MoS 2 Transistor. Nano Lett 2023. [PMID: 37363814 DOI: 10.1021/acs.nanolett.3c01779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/28/2023]
Abstract
Spins confined to atomically thin semiconductors are being actively explored as quantum information carriers. In transition metal dichalcogenides (TMDCs), the hexagonal crystal lattice gives rise to an additional valley degree of freedom with spin-valley locking and potentially enhanced spin life and coherence times. However, realizing well-separated single-particle levels and achieving transparent electrical contact to address them has remained challenging. Here, we report well-defined spin states in a few-layer MoS2 transistor, characterized with a spectral resolution of ∼50 μeV at Tel = 150 mK. Ground state magnetospectroscopy confirms a finite Berry-curvature induced coupling of spin and valley, reflected in a pronounced Zeeman anisotropy, with a large out-of-plane g-factor of g⊥ ≃ 8. A finite in-plane g-factor (g∥ ≃ 0.55-0.8) allows us to quantify spin-valley locking and estimate the spin-orbit splitting 2ΔSO ∼ 100 μeV. The demonstration of spin-valley locking is an important milestone toward realizing spin-valley quantum bits.
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Affiliation(s)
- Radha Krishnan
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371
| | - Sangram Biswas
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371
| | - Yu-Ling Hsueh
- School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Hongyang Ma
- School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Rajib Rahman
- School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Bent Weber
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371
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3
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Meyer M, Déprez C, van Abswoude TR, Meijer IN, Liu D, Wang CA, Karwal S, Oosterhout S, Borsoi F, Sammak A, Hendrickx NW, Scappucci G, Veldhorst M. Electrical Control of Uniformity in Quantum Dot Devices. Nano Lett 2023; 23:2522-2529. [PMID: 36975126 PMCID: PMC10103318 DOI: 10.1021/acs.nanolett.2c04446] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 03/20/2023] [Indexed: 06/18/2023]
Abstract
Highly uniform quantum systems are essential for the practical implementation of scalable quantum processors. While quantum dot spin qubits based on semiconductor technology are a promising platform for large-scale quantum computing, their small size makes them particularly sensitive to their local environment. Here, we present a method to electrically obtain a high degree of uniformity in the intrinsic potential landscape using hysteretic shifts of the gate voltage characteristics. We demonstrate the tuning of pinch-off voltages in quantum dot devices over hundreds of millivolts that then remain stable at least for hours. Applying our method, we homogenize the pinch-off voltages of the plunger gates in a linear array for four quantum dots, reducing the spread in pinch-off voltages by one order of magnitude. This work provides a new tool for the tuning of quantum dot devices and offers new perspectives for the implementation of scalable spin qubit arrays.
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Affiliation(s)
- Marcel Meyer
- QuTech
and Kavli Institute of Nanoscience, Delft
University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands
| | - Corentin Déprez
- QuTech
and Kavli Institute of Nanoscience, Delft
University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands
| | - Timo R. van Abswoude
- QuTech
and Kavli Institute of Nanoscience, Delft
University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands
| | - Ilja N. Meijer
- QuTech
and Kavli Institute of Nanoscience, Delft
University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands
| | - Dingshan Liu
- QuTech
and Kavli Institute of Nanoscience, Delft
University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands
| | - Chien-An Wang
- QuTech
and Kavli Institute of Nanoscience, Delft
University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands
| | - Saurabh Karwal
- QuTech
and Netherlands Organisation for Applied Scientific Research (TNO), PO Box 155, 2600 AD Delft, The Netherlands
| | - Stefan Oosterhout
- QuTech
and Netherlands Organisation for Applied Scientific Research (TNO), PO Box 155, 2600 AD Delft, The Netherlands
| | - Francesco Borsoi
- QuTech
and Kavli Institute of Nanoscience, Delft
University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands
| | - Amir Sammak
- QuTech
and Netherlands Organisation for Applied Scientific Research (TNO), PO Box 155, 2600 AD Delft, The Netherlands
| | - Nico W. Hendrickx
- QuTech
and Kavli Institute of Nanoscience, Delft
University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands
| | - Giordano Scappucci
- QuTech
and Kavli Institute of Nanoscience, Delft
University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands
| | - Menno Veldhorst
- QuTech
and Kavli Institute of Nanoscience, Delft
University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands
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4
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Marton V, Sachrajda A, Korkusinski M, Bogan A, Studenikin S. Coherence Characteristics of a GaAs Single Heavy-Hole Spin Qubit Using a Modified Single-Shot Latching Readout Technique. Nanomaterials (Basel) 2023; 13:950. [PMID: 36903828 PMCID: PMC10005315 DOI: 10.3390/nano13050950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 02/27/2023] [Accepted: 03/02/2023] [Indexed: 06/18/2023]
Abstract
We present an experimental study of the coherence properties of a single heavy-hole spin qubit formed in one quantum dot of a gated GaAs/AlGaAs double quantum dot device. We use a modified spin-readout latching technique in which the second quantum dot serves both as an auxiliary element for a fast spin-dependent readout within a 200 ns time window and as a register for storing the spin-state information. To manipulate the single-spin qubit, we apply sequences of microwave bursts of various amplitudes and durations to make Rabi, Ramsey, Hahn-echo, and CPMG measurements. As a result of the qubit manipulation protocols combined with the latching spin readout, we determine and discuss the achieved qubit coherence times: T1, TRabi, T2*, and T2CPMG vs. microwave excitation amplitude, detuning, and additional relevant parameters.
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5
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Fernández-Acebal P, Rosolio O, Scheuer J, Müller C, Müller S, Schmitt S, McGuinness LP, Schwarz I, Chen Q, Retzker A, Naydenov B, Jelezko F, Plenio MB. Toward Hyperpolarization of Oil Molecules via Single Nitrogen Vacancy Centers in Diamond. Nano Lett 2018; 18:1882-1887. [PMID: 29470089 DOI: 10.1021/acs.nanolett.7b05175] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Efficient polarization of organic molecules is of extraordinary relevance when performing nuclear magnetic resonance (NMR) and imaging. Commercially available routes to dynamical nuclear polarization (DNP) work at extremely low temperatures, relying on the solidification of organic samples and thus bringing the molecules out of their ambient thermal conditions. In this work, we investigate polarization transfer from optically pumped nitrogen vacancy centers in diamond to external molecules at room temperature. This polarization transfer is described by both an extensive analytical analysis and numerical simulations based on spin bath bosonization and is supported by experimental data in excellent agreement. These results set the route to hyperpolarization of diffusive molecules in different scenarios and consequently, due to an increased signal, to high-resolution NMR.
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Affiliation(s)
- P Fernández-Acebal
- Institut für Theoretische Physik and Center for Integrated Quantum Science and Technology (IQST) , Universität Ulm , Albert-Einstein Allee 11 , 89069 Ulm , Germany
| | - O Rosolio
- Racah Institute of Physics , The Hebrew University of Jerusalem , Jerusalem , 91904 Givat Ram , Israel
| | - J Scheuer
- Institute for Quantum Optics and Center for Integrated Quantum Science and Technology (IQST) , Universität Ulm , Albert-Einstein-Allee 11 , 89069 Ulm , Germany
| | - C Müller
- Institute for Quantum Optics and Center for Integrated Quantum Science and Technology (IQST) , Universität Ulm , Albert-Einstein-Allee 11 , 89069 Ulm , Germany
| | - S Müller
- Institute for Quantum Optics and Center for Integrated Quantum Science and Technology (IQST) , Universität Ulm , Albert-Einstein-Allee 11 , 89069 Ulm , Germany
| | - S Schmitt
- Institute for Quantum Optics and Center for Integrated Quantum Science and Technology (IQST) , Universität Ulm , Albert-Einstein-Allee 11 , 89069 Ulm , Germany
| | - L P McGuinness
- Institute for Quantum Optics and Center for Integrated Quantum Science and Technology (IQST) , Universität Ulm , Albert-Einstein-Allee 11 , 89069 Ulm , Germany
| | - I Schwarz
- Institut für Theoretische Physik and Center for Integrated Quantum Science and Technology (IQST) , Universität Ulm , Albert-Einstein Allee 11 , 89069 Ulm , Germany
| | - Q Chen
- Institut für Theoretische Physik and Center for Integrated Quantum Science and Technology (IQST) , Universität Ulm , Albert-Einstein Allee 11 , 89069 Ulm , Germany
| | - A Retzker
- Racah Institute of Physics , The Hebrew University of Jerusalem , Jerusalem , 91904 Givat Ram , Israel
| | - B Naydenov
- Institute for Quantum Optics and Center for Integrated Quantum Science and Technology (IQST) , Universität Ulm , Albert-Einstein-Allee 11 , 89069 Ulm , Germany
| | - F Jelezko
- Institute for Quantum Optics and Center for Integrated Quantum Science and Technology (IQST) , Universität Ulm , Albert-Einstein-Allee 11 , 89069 Ulm , Germany
| | - M B Plenio
- Institut für Theoretische Physik and Center for Integrated Quantum Science and Technology (IQST) , Universität Ulm , Albert-Einstein Allee 11 , 89069 Ulm , Germany
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6
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Pfender M, Aslam N, Simon P, Antonov D, Thiering G, Burk S, Fávaro de Oliveira F, Denisenko A, Fedder H, Meijer J, Garrido JA, Gali A, Teraji T, Isoya J, Doherty MW, Alkauskas A, Gallo A, Grüneis A, Neumann P, Wrachtrup J. Protecting a Diamond Quantum Memory by Charge State Control. Nano Lett 2017; 17:5931-5937. [PMID: 28872881 DOI: 10.1021/acs.nanolett.7b01796] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In recent years, solid-state spin systems have emerged as promising candidates for quantum information processing. Prominent examples are the nitrogen-vacancy (NV) center in diamond, phosphorus dopants in silicon (Si:P), rare-earth ions in solids, and VSi-centers in silicon-carbide. The Si:P system has demonstrated that its nuclear spins can yield exceedingly long spin coherence times by eliminating the electron spin of the dopant. For NV centers, however, a proper charge state for storage of nuclear spin qubit coherence has not been identified yet. Here, we identify and characterize the positively charged NV center as an electron-spin-less and optically inactive state by utilizing the nuclear spin qubit as a probe. We control the electronic charge and spin utilizing nanometer scale gate electrodes. We achieve a lengthening of the nuclear spin coherence times by a factor of 4. Surprisingly, the new charge state allows switching of the optical response of single nodes facilitating full individual addressability.
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Affiliation(s)
- Matthias Pfender
- Stuttgart Research Center of Photonic Engineering (SCoPE) and Center for Integrated Quantum Science and Technology (IQST), Third Institute of Physics, University of Stuttgart , 70569 Stuttgart, Germany
| | - Nabeel Aslam
- Stuttgart Research Center of Photonic Engineering (SCoPE) and Center for Integrated Quantum Science and Technology (IQST), Third Institute of Physics, University of Stuttgart , 70569 Stuttgart, Germany
| | - Patrick Simon
- Walter Schottky Institut, Physik-Department, Technische Universität München , Am Coulombwall 3, 85748 Garching, Germany
| | - Denis Antonov
- Stuttgart Research Center of Photonic Engineering (SCoPE) and Center for Integrated Quantum Science and Technology (IQST), Third Institute of Physics, University of Stuttgart , 70569 Stuttgart, Germany
| | - Gergő Thiering
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences , P.O. Box 49, H-1525 Budapest, Hungary
- Department of Atomic Physics, Budapest University of Technology and Economics , Budafoki út 8, H-1111 Budapest, Hungary
| | - Sina Burk
- Stuttgart Research Center of Photonic Engineering (SCoPE) and Center for Integrated Quantum Science and Technology (IQST), Third Institute of Physics, University of Stuttgart , 70569 Stuttgart, Germany
| | - Felipe Fávaro de Oliveira
- Stuttgart Research Center of Photonic Engineering (SCoPE) and Center for Integrated Quantum Science and Technology (IQST), Third Institute of Physics, University of Stuttgart , 70569 Stuttgart, Germany
| | - Andrej Denisenko
- Stuttgart Research Center of Photonic Engineering (SCoPE) and Center for Integrated Quantum Science and Technology (IQST), Third Institute of Physics, University of Stuttgart , 70569 Stuttgart, Germany
| | - Helmut Fedder
- Stuttgart Research Center of Photonic Engineering (SCoPE) and Center for Integrated Quantum Science and Technology (IQST), Third Institute of Physics, University of Stuttgart , 70569 Stuttgart, Germany
- Swabian Instruments GmbH, Frankenstr. 39, 71701 Schwieberdingen, Germany
| | - Jan Meijer
- Institute for Experimental Physics II, Universität Leipzig , Linnéstraße 5, 04103 Leipzig, Germany
| | - Jose A Garrido
- Walter Schottky Institut, Physik-Department, Technische Universität München , Am Coulombwall 3, 85748 Garching, Germany
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and the Barcelona Institute of Science and Technology , Campus UAB, Bellaterra, 08193 Barcelona, Spain
- ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
| | - Adam Gali
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences , P.O. Box 49, H-1525 Budapest, Hungary
- Department of Atomic Physics, Budapest University of Technology and Economics , Budafoki út 8, H-1111 Budapest, Hungary
| | - Tokuyuki Teraji
- National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Junichi Isoya
- Research Center for Knowledge Communities, University of Tsukuba , Tsukuba 305-8550, Japan
| | - Marcus William Doherty
- Laser Physics Centre, Research School of Physics and Engineering, Australian National University , Australian Capital Territory 2601, Australia
| | - Audrius Alkauskas
- Center for Physical Sciences and Technology, Vilnius LT-10257, Lithuania
| | - Alejandro Gallo
- Max Planck Institute for Solid State Research , Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - Andreas Grüneis
- Max Planck Institute for Solid State Research , Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - Philipp Neumann
- Stuttgart Research Center of Photonic Engineering (SCoPE) and Center for Integrated Quantum Science and Technology (IQST), Third Institute of Physics, University of Stuttgart , 70569 Stuttgart, Germany
| | - Jörg Wrachtrup
- Stuttgart Research Center of Photonic Engineering (SCoPE) and Center for Integrated Quantum Science and Technology (IQST), Third Institute of Physics, University of Stuttgart , 70569 Stuttgart, Germany
- Max Planck Institute for Solid State Research , Heisenbergstraße 1, 70569 Stuttgart, Germany
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Takeda K, Kamioka J, Otsuka T, Yoneda J, Nakajima T, Delbecq MR, Amaha S, Allison G, Kodera T, Oda S, Tarucha S. A fault-tolerant addressable spin qubit in a natural silicon quantum dot. Sci Adv 2016; 2:e1600694. [PMID: 27536725 PMCID: PMC4982751 DOI: 10.1126/sciadv.1600694] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 07/12/2016] [Indexed: 05/18/2023]
Abstract
Fault-tolerant quantum computing requires high-fidelity qubits. This has been achieved in various solid-state systems, including isotopically purified silicon, but is yet to be accomplished in industry-standard natural (unpurified) silicon, mainly as a result of the dephasing caused by residual nuclear spins. This high fidelity can be achieved by speeding up the qubit operation and/or prolonging the dephasing time, that is, increasing the Rabi oscillation quality factor Q (the Rabi oscillation decay time divided by the π rotation time). In isotopically purified silicon quantum dots, only the second approach has been used, leaving the qubit operation slow. We apply the first approach to demonstrate an addressable fault-tolerant qubit using a natural silicon double quantum dot with a micromagnet that is optimally designed for fast spin control. This optimized design allows access to Rabi frequencies up to 35 MHz, which is two orders of magnitude greater than that achieved in previous studies. We find the optimum Q = 140 in such high-frequency range at a Rabi frequency of 10 MHz. This leads to a qubit fidelity of 99.6% measured via randomized benchmarking, which is the highest reported for natural silicon qubits and comparable to that obtained in isotopically purified silicon quantum dot-based qubits. This result can inspire contributions to quantum computing from industrial communities.
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Affiliation(s)
- Kenta Takeda
- RIKEN, Center for Emergent Matter Science, Wako-shi, Saitama 351-0198, Japan
- Corresponding author.
| | - Jun Kamioka
- Department of Physical Electronics and Quantum Nanoelectronics Research Center, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Tomohiro Otsuka
- RIKEN, Center for Emergent Matter Science, Wako-shi, Saitama 351-0198, Japan
| | - Jun Yoneda
- RIKEN, Center for Emergent Matter Science, Wako-shi, Saitama 351-0198, Japan
| | - Takashi Nakajima
- RIKEN, Center for Emergent Matter Science, Wako-shi, Saitama 351-0198, Japan
| | - Matthieu R. Delbecq
- RIKEN, Center for Emergent Matter Science, Wako-shi, Saitama 351-0198, Japan
| | - Shinichi Amaha
- RIKEN, Center for Emergent Matter Science, Wako-shi, Saitama 351-0198, Japan
| | - Giles Allison
- RIKEN, Center for Emergent Matter Science, Wako-shi, Saitama 351-0198, Japan
| | - Tetsuo Kodera
- Department of Physical Electronics and Quantum Nanoelectronics Research Center, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Shunri Oda
- Department of Physical Electronics and Quantum Nanoelectronics Research Center, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Seigo Tarucha
- RIKEN, Center for Emergent Matter Science, Wako-shi, Saitama 351-0198, Japan
- Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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