Article
Chemistry, Multidisciplinary
Kazuyuki Kuroyama, Jinkwan Kwoen, Yasuhiko Arakawa, Kazuhiko Hirakawa
Summary: This study demonstrates electrical access to an ultrastrongly coupled system by fabricating a gate-defined quantum point contact near a terahertz split-ring resonator. The observed photocurrent spectrum with significant anticrossing is attributed to coupling between the cyclotron resonance of the two-dimensional electrons and the resonator. The photocurrent signal is explained by energy-selective transmission/reflection of the quantum Hall edge channels at the quantum point contact.
Article
Chemistry, Multidisciplinary
Philip Willke, Tobias Bilgeri, Xue Zhang, Yu Wang, Christoph Wolf, Herve Aubin, Andreas Heinrich, Taeyoung Choi
Summary: Control of single electron spins is promising for spintronics. Using single molecular magnets as hosts allows for coherent spin manipulation and individual addressable molecular spins in self-assemblies.
Article
Physics, Multidisciplinary
Maryse Ernzer, Manel Bosch Aguilera, Matteo Brunelli, Gian-Luca Schmid, Thomas M. Karg, Christoph Bruder, Patrick P. Potts, Philipp Treutlein
Summary: Feedback is a powerful technique in system control, but in quantum physics, measurements modify the system. Coherent feedback is a different approach that processes and feeds back quantum signals without measuring the system. This study presents the experimental realization of an optical coherent feedback platform to control the motion of a nanomechanical membrane.
Article
Quantum Science & Technology
E. Vahapoglu, J. P. Slack-Smith, R. C. C. Leon, W. H. Lim, F. E. Hudson, T. Day, J. D. Cifuentes, T. Tanttu, C. H. Yang, A. Saraiva, N. Abrosimov, H-J Pohl, M. L. W. Thewalt, A. Laucht, A. S. Dzurak, J. J. Pla
Summary: This study reports the coherent Rabi oscillations of single electron spin qubits in a planar SiMOS quantum dot device using a global magnetic field generated off-chip. The observation of coherent qubit control driven by a dielectric resonator establishes a credible pathway to achieving large-scale control in a spin-based quantum computer.
NPJ QUANTUM INFORMATION
(2022)
Article
Optics
Zhidong Gu, Jiaxin Chen, Bofeng Gao, Wei Wu, Zhenyu Zhao, Wei Cai, Xinzheng Zhang, Mengxin Ren, Jingjun Xu
Summary: In this work, a high-Q metasurface utilizing a topological strategy is proposed. By stacking two conjugated nanopillar arrays with different topological invariants, a topological edge state appears at the interfaces of the nanopillars, leading to a sharp transmission resonance with a Q-factor of over 1000. The sensing application of this high-Q topological metasurface is demonstrated, showing promising potential for various applications.
Article
Chemistry, Multidisciplinary
Joo Hwan Ko, Jin-Hwi Park, Young Jin Yoo, Sehui Chang, Jiwon Kang, Aiguo Wu, Fang Yang, Sejeong Kim, Hae-Gon Jeon, Young Min Song
Summary: A novel approach of using a thin-film optical Fano resonator with a porous layer allows for controllable Fano parameters and adjustable spectral shapes. By manipulating the polarization, the Fano device exhibits switchable behavior between quasi-Lorentzian and negative Fano states. Enhanced bio-particle sensing capabilities are demonstrated and an inverse design tool based on a multilayer perceptron model is developed for efficient optimization.
Article
Chemistry, Multidisciplinary
Yuying Lu, Tengteng Li, Maosheng Yang, Haiyun Yao, Lanju Liang, Xin Yan, Kai Kai Lv, Meng Wang, Qili Yang, Chaoyang Wei, Jianda Shao, Jianquan Yao
Summary: The study demonstrates dual control of multi-band Fano resonances with a metal-halide perovskite-integrated terahertz metasurface by lasers and an electrical field, achieving ultrasensitive optoelectronic modulation, showing promising application prospects.
Article
Quantum Science & Technology
Bao-Jie Liu, Man-Hong Yung
Summary: STIRUP is a faster and more robust quantum state control method compared to STIRAP, capable of combatting decoherence and experimental imperfections. Generalized STIRUP is simpler and compatible with more complex energy-level structures and many-body systems compared to other techniques.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Maryam Abbasi, Weijian Chen, Mahdi Naghiloo, Yogesh N. Joglekar, Kater W. Murch
Summary: This study investigates the quantum evolution of a non-Hermitian qubit in a dissipative superconducting transmon circuit. By tuning the system parameters in real-time to encircle an exceptional point, nonreciprocal quantum state transfer is achieved. The accumulation of chiral geometric phases during state transport verifies the quantum coherent nature of the evolution in the complex energy landscape, distinguishing between coherent and incoherent effects associated with encircling exceptional points. This work demonstrates a novel method for controlling quantum state vectors, highlighting the possibilities enabled through dynamical non-Hermitian control in quantum bath engineering.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Peng Peng, Yonghao Mi, Marianna Lytova, Mathew Britton, Xiaoyan Ding, A. Yu. Naumov, P. B. Corkum, D. M. Villeneuve
Summary: By generating quantum coherence in the ground electronic state of hydrogen molecules, we are able to control the absorption spectrum, making it negative at 12 eV, which is the optical gain. These findings offer new insights into controlling spectral lineshapes and pave the way for achieving lasing without inversion in the XUV spectral range.
Article
Optics
Xinyu Chen, Feixiang Xu, Huichao Xu, Lijian Zhang
Summary: An efficient tomography method is proposed to address the reconstruction complexity of general quantum coherent-optical detectors. By extracting linear loss and obtaining effective positive-operator-valued measure in matrix representations, the method is applied to reconstruct a typical coherent detector and highlights the effects of linear loss on nonclassical features of coherent optical detectors.
Article
Optics
Johann A. Preuss, Daniel Groll, Robert Schmidt, Thilo Hahn, Pawel Machnikowski, Rudolf Bratschitsch, Tilmann Kuhn, Steffen Michaelis De Vasconcellos, Daniel Wigger
Summary: This study demonstrates coherent state manipulation of a single color center in hexagonal boron nitride (hBN) and investigates the coupling between the electronic system and phonons. The results reveal the application of quantum control techniques in both phonon-assisted and resonant excitation, paving the way for ultrafast phonon quantum state control on the nanoscale and hybrid quantum technologies.
Article
Physics, Multidisciplinary
Martin Hayhurst Appel, Alexey Tiranov, Alisa Javadi, Matthias C. Lobl, Ying Wang, Sven Scholz, Andreas D. Wieck, Arne Ludwig, Richard J. Warburton, Peter Lodahl
Summary: Solid-state quantum dots show promise as efficient light-matter interfaces connecting internal spin degrees of freedom to emitted photon states. However, selection rules currently prevent the combination of efficient spin control and optical cyclicity in this platform. By utilizing a photonic crystal waveguide, researchers have experimentally demonstrated optical cyclicity while achieving high fidelity spin initialization and coherent optical spin control, paving the way for scalable multiphoton entanglement generation and on-chip spin-photon gates.
PHYSICAL REVIEW LETTERS
(2021)
Article
Quantum Science & Technology
Nicola Biagi, Saverio Francesconi, Manuel Gessner, Marco Bellini, Alessandro Zavatta
Summary: A remote phase sensing scheme is proposed and experimentally tested, showing a sensitivity that scales with the intensity of the local coherent states.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Multidisciplinary Sciences
Yujia Zhang, Minjian Lu, Zhendong Zhu, Yan Li, Haoyun Wei
Summary: Based on the enhancement factor of broadband SECARS excitation process, a novel Fano resonance plasmonic nanostructure is studied, which shows significant enhancement effect in a wide wavenumber region, covering most of the fingerprint region. This geometrically-tunable Fano plasmonic nanostructure provides a way to realize broadband-enhanced CARS, with potentials in single-molecular monitoring and high-selectivity biochemical detection.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Multidisciplinary
N. Arabchigavkani, R. Somphonsane, H. Ramamoorthy, G. He, J. Nathawat, S. Yin, B. Barut, K. He, M. D. Randle, R. Dixit, K. Sakanashi, N. Aoki, K. Zhang, L. Wang, W-N Mei, P. A. Dowben, J. Fransson, J. P. Bird
Summary: Mesoscopic conductance fluctuations are a common feature in small conductors, but this study reveals a breakdown of universality due to the interplay of local and remote phenomena in transport. The experiments demonstrate that remote factors can significantly impact conductivity in phase-coherent conductors, leading to giant conductance fluctuations exceeding theoretical predictions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Applied
Kohei Sakanashi, Naoto Wada, Kentaro Murase, Kenichi Oto, Gil-Ho Kim, Kenji Watanabe, Takashi Taniguchi, Jonathan P. Bird, David K. Ferry, Nobuyuki Aoki
Summary: In this study, quantum point contacts narrower than 100nm were fabricated by applying a perpendicular electric field to bilayer graphene encapsulated between hexagonal boron nitride sheets. The conductance across the quantum point contact was quantized at a high perpendicular-displacement field, with a quantization unit of 2e(2)/h. The presence of a lifted degeneracy state in the quantum point contact suggests the existence of a valley polarized state possibly originating from the potential profile or effective displacement field in the one-dimensional channel.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Keke He, Bilal Barut, Shenchu Yin, Michael D. Randle, Ripudaman Dixit, Nargess Arabchigavkani, Jubin Nathawat, Ather Mahmood, Will Echtenkamp, Christian Binek, Peter A. Dowben, Jonathan P. Bird
Summary: Evidence is provided for robust spin-dependent transport in monolayer graphene deposited on the surface of the antiferromagnetic/magneto-electric oxide chromia. The measurements reveal a strong signal that is present even at zero external magnetic field and remains visible at high temperatures. These results suggest that graphene-on-chromia heterostructures have great potential for spintronic devices.
ADVANCED MATERIALS
(2022)
Article
Physics, Applied
M. D. Randle, A. Lipatov, A. Datta, A. Kumar, I. Mansaray, A. Sinitskii, U. Singisetti, J. E. Han, J. P. Bird
Summary: We investigate the behavior of metal-insulator transition in TiS3 nanowire field-effect transistors under strongly nonequilibrium conditions. We observe the emergence of a critical fixed point that separates insulating and metallic regions in the device's transfer curves. The critical gate voltage defining this fixed point changes systematically with the drain bias, allowing us to map out a phase diagram. The field-induced metal-insulator transition in TiS3 can occur over a wide range of temperatures, depending on the choice of gate voltage used to tune the carrier concentration.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Shenchu Yin, Keke He, Michael D. Randle, Bilal Barut, Ripudaman Dixit, Alexey Lipatov, Alexander Sinitskii, Jonathan P. Bird
Summary: This study investigates the transient response of N,N-diethyl-N-(2-methoxyethyl)-N-methylammonium bis(trifluoromethylsulfonyl)-imide-based ionic liquid planar capacitors and identifies three distinct mechanisms for charging/discharging. These mechanisms include the development of polarization charge in the liquid dielectric, electric double layer formation, and pseudocapacitance arising from electrochemical reactions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
J. Fransson
Summary: This study investigates the charge and spin dynamics in chiral molecules after their immediate coupling to an external metallic reservoir. The research describes the induction of spin polarization in chiral structures as a response to charge dynamics. The dynamics show that chirality-induced spin selectivity is an excited state phenomenon that can be partially explained using a simplistic single-particle description in the transient regime, but in the stationary limit, electron correlations, such as electron-vibration interactions, are crucial in sustaining an intrinsic spin anisotropy that leads to a nonvanishing spin selectivity. Furthermore, the dynamics provide insight into enantiomer separation based on different acquired spin polarizations.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Nhat Anh Nguyen Phan, Hamin Noh, Jihoon Kim, Yewon Kim, Hanul Kim, Dongmok Whang, Nobuyuki Aoki, Kenji Watanabe, Takashi Taniguchi, Gil-Ho Kim
Summary: This study introduces a strategy to overcome contact resistance and surface contamination of TMD materials by inserting a monolayer of h-BN at the Cr and WS2 interface. The experimental results show that the contact resistance is significantly reduced and electron mobility is greatly enhanced with the insertion of monolayer h-BN.
Article
Chemistry, Multidisciplinary
Bilal Barut, Xavier Cantos-Roman, Justin Crabb, Chun-Pui Kwan, Ripudaman Dixit, Nargess Arabchigavkani, Shenchu Yin, Jubin Nathawat, Keke He, Michael D. Randle, Farah Vandrevala, Takeyoshi Sugaya, Erik Einarsson, Josep M. Jornet, Jonathan P. Bird, Gregory R. Aizin
Summary: This study presents an approach to generate on-chip THz signals using nanoscale transistors with specific structural asymmetry. The asymmetry supports plasma-wave amplification, leading to pronounced NDC. The researchers also demonstrate how this feature can persist at high temperatures. These findings are a significant step forward for the development of active components for THz electronics.
Article
Physics, Condensed Matter
Archit Dhingra, Xuedong Hu, Mario F. Borunda, Joseph F. Johnson, Christian Binek, Jonathan Bird, Alpha T. N'Diaye, Jean-Pascal Sutter, Emilie Delahaye, Eric D. Switzer, Enrique del Barco, Talat S. Rahman, Peter A. Dowben
Summary: This article discusses the application of quantum information science without entangled states, focusing on devices with continuous readout. It proposes a solid-state version of the Mach-Zehnder interferometer as an alternative to qubits, where local moments and spin polarization are used instead of light polarization. The article also provides insights into the mathematical principles of quantum information processes involving molecular systems with large magnetic anisotropy. Furthermore, it explores novel approaches to address scalability issues in quantum devices.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Chemistry, Multidisciplinary
Hai Yen Le Thi, Tien Dat Ngo, Nhat Anh Nguyen Phan, Won Jong Yoo, Kenji Watanabe, Takashi Taniguchi, Nobuyuki Aoki, Jonathan P. Bird, Gil-Ho Kim
Summary: In this study, a lateral p-n junction diode is fabricated in tungsten diselenide, showing high on/off ratio, mobility, and stability.
Article
Chemistry, Physical
J. Fransson
Summary: Magnetic phenomena in chemistry and condensed matter physics are usually associated with low temperatures. However, recent experimental observations on supramolecular aggregates suggest a surprising increase in magnetic coercivity with increasing temperature and enhancement of the chiral-induced spin selectivity effect. A proposed mechanism for vibrationally stabilized magnetism, along with a theoretical model, can explain the qualitative aspects of these experimental findings. The proposal argues that anharmonic vibrations, which become more pronounced at higher temperatures, can stabilize and sustain magnetic states, particularly in structures without inversion and/or reflection symmetries, such as chiral molecules and crystals.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Multidisciplinary Sciences
Jubin Nathawat, Ishiaka Mansaray, Kohei Sakanashi, Naoto Wada, Michael D. Randle, Shenchu Yin, Keke He, Nargess Arabchigavkani, Ripudaman Dixit, Bilal Barut, Miao Zhao, Harihara Ramamoorthy, Ratchanok Somphonsane, Gil-Ho Kim, Kenji Watanabe, Takashi Taniguchi, Nobuyuki Aoki, Jong E. Han, Jonathan P. Bird
Summary: Stacking graphene with h-BN can change its bands, creating narrow minigaps and wider minibands. Hot carrier dynamics in these bands are crucial for functional (opto)electronic devices. In this study, we use rapid electrical pulsing to drive carriers into the strong electron-phonon coupling limit. By adjusting the chemical potential, we observe a cyclical evolution between metallic and semiconducting states. Our results show the importance of considering the dynamics of hot carriers and hot phonons in functional graphene superlattices.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Jong E. Han, Camille Aron, Xi Chen, Ishiaka Mansaray, Jae-Ho Han, Ki-Seok Kim, Michael Randle, Jonathan P. Bird
Summary: The significant difference between predicted and experimental switching fields in correlated insulators under a far-from-equilibrium DC electric field necessitates a reevaluation of current microscopic understanding. The authors introduce a generic model of electrons coupled to an inelastic phononic medium and show that an electron avalanche can occur in the bulk limit of such insulators at arbitrarily small electric field. The quantum avalanche is triggered by the generation of in-gap states through a multi-phonon emission process, leading to a premature and partial collapse of the correlated gap.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Kendon Shirley, Hsinhan Tsai, Nicholas Cucciniello, Jonathan Bird, Quanxi Jia, Elias Torres, Phil Butler, Anthony Butler, Jerome Crocco, Eslam Taha, Abdulsalam Alhawsawi, Jessica Germino, Maoz Dor, Chaochao Dun, Omer Firat, Jared Parker, Matt Graham, Kostya S. Novoselov, Wanyi Nie
Summary: We have developed a recyclable perovskite-graphene heterostructure for high-performance X-ray detection in medical imaging. The graphene pixel maintains high mobility even after perovskite deposition, enabling efficient conversion for ultrahigh sensitivity. By increasing the operational bias of the graphene channel, the signal-to-noise ratio of X-ray detection can be significantly improved. The perovskite layer can be easily washed off without damaging the graphene, making our heterostructure X-ray detector recyclable.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
J. Fransson
Summary: Magnetic phenomena in chemistry and condensed matter physics are typically associated with low temperatures. However, recent experimental observations on supramolecular aggregates suggest that the magnetic coercivity may increase with increasing temperature, and the chiral-induced spin selectivity effect may be enhanced. A proposed mechanism for vibrationally stabilized magnetism and a theoretical model are introduced to explain these findings, suggesting that anharmonic vibrations enable nuclear vibrations to stabilize and sustain magnetic states in structures without inversion and/or reflection symmetries, such as chiral molecules and crystals.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
