Article
Chemistry, Multidisciplinary
Hailong Fu, Ke Huang, Kenji Watanabe, Takashi Taniguchi, Morteza Kayyalha, Jun Zhu
Summary: In this experiment, Fabry-Perot interferometers were constructed using a split-gate design and measurements of Aharonov-Bohm oscillations were presented. The velocity of the edge state was found to be approximately 6 x 10(4) m/s at filling factor nu = 2 and decreased with increasing filling factor. The dc bias and temperature dependence of the interference suggested electron-electron interaction induced decoherence mechanisms. These results pave the way for exploring fractional and non-Abelian braiding statistics in this promising device platform.
Article
Engineering, Electrical & Electronic
Zhihai Liu, Baichuan Zhao, Yu Zhang, Yaxun Zhang, Chunyu Sha, Jun Yang, Libo Yuan
Summary: A new method for fabricating a Fabry-Perot interferometer sensor using photopolymerizable materials is proposed and demonstrated in this study. By incorporating PDMS into the photopolymer material, the sensor is proven to have the ability to sense various parameters, with the relationship between PDMS concentration and temperature sensitivity being investigated.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Engineering, Electrical & Electronic
Xinruo Yi, Kehao Zhao, Kevin P. Chen
Summary: This work presents multiplexable fiber optical sensors for multiple-point pH measurements. By using a femtosecond laser direct writing approach, an array of intrinsic Fabry-Peirot interferometer (IFPI) sensors was inscribed in standard single-mode fibers. A sol-gel dip coating process was employed to deposit Palladium-doped Titanium Dioxide (Pd-TiO2) sensory film on IFPI sensors for pH measurement, while an uncoated sensor was used to measure temperature of aquatic solutions to eliminate the influence of temperature fluctuation on pH measurements. Pd nanoparticles in the sensory films act as a catalyst to convert hydrogen ions in aquatic solutions to Pd hydride, which produces strains on IFPI sensors. White light interferometry demodulation algorithm was applied to resolve the strain exerted on IFPI sensors induced by pH value changes in aquatic solution. The presented sensor exhibited reversible and reproducible response in aquatic solutions with pH values ranging from 1.0 to 7.0 at room temperature. The response time of the pH sensors was approximately 7 seconds for all measurements conducted. The technology demonstrated in this paper has the potential to perform multi-point pH and temperature measurements using a single fiber.
IEEE SENSORS JOURNAL
(2022)
Article
Multidisciplinary Sciences
Pablo Roldan-Varona, Rosa Ana Perez-Herrera, Luis Rodriguez-Cobo, Luis Reyes-Gonzalez, Manuel Lopez-Amo, Jose Miguel Lopez-Higuera
Summary: A novel optical fiber sensor capable of measuring liquid level and refractive index has been designed, manufactured and demonstrated in this work. By processing a silica capillary hollow-core fiber with a femtosecond laser, the system can achieve a high resolution of 4 mu m for liquid level measurement. In the future, it has the potential to measure the level of immiscible liquids as well.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Elias Portoles, Giulia Zheng, Folkert K. de Vries, Jihang Zhu, Petar Tomic, Takashi Taniguchi, Kenji Watanabe, Allan H. MacDonald, Klaus Ensslin, Thomas Ihn, Peter Rickhaus
Summary: The rich and tunable phase diagram exhibited by moire materials has made them an ideal platform for hosting versatile devices. Understanding electronic transport and localization across electrically defined interfaces is of fundamental importance for engineering such devices. In this study, a cavity is electrostatically defined across a twisted double bilayer graphene sample, revealing Fabry-Perot oscillations and Coulomb blockade resonances indicative of strong electronic confinement. Quantum dots are observed at the interfaces of the cavity, providing a first step towards better understanding interfacial phenomena in single crystal moire devices.
Correction
Optics
Meng Ding, Eric Numkam Fokoua, John R. Hayes, Hesham Sakr, Peter Horak, Francesco Poletti, David J. Richardson, Radan Slavik
Summary: In the original publication of our research article, we found an error that needs to be corrected. We apologize for any confusion caused by this error. The correction does not affect the overall conclusions of the paper.
Article
Chemistry, Analytical
Ning Wang, Wenhao Tian, Haosheng Zhang, Xiaodan Yu, Xiaolei Yin, Yonggang Du, Dailin Li
Summary: This study introduces an optical fiber humidity sensor with high sensitivity and good linear response by filling Graphene Quantum Dots into a Fabry-Perot resonator. The sensor demonstrated excellent performance in response to both relative humidity and temperature fluctuations, with different cavity lengths also showing high sensitivity and linear response. The combination of GQDs and single mode optical fiber proved to be effective for humidity sensing applications.
Article
Physics, Applied
C. A. Sgroi, J. Brault, J. -Y. Duboz, S. Chenot, P. Vennegues, A. Ludwig, A. D. Wieck
Summary: We present capacitance-voltage measurements of self-assembled wurtzite-GaN quantum dots (QDs). The QDs are embedded in a charge-tunable diode structure and were grown by molecular beam epitaxy using the Stranski-Krastanov growth method. The study shows that charges and the internal electric fields influence the energy spacing in the QDs and demonstrates the possibility of achieving single-electron charging and Coulomb blockade energy in the QDs at room temperature.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Yiqun Ni, Xiangyang Li, Wenqing Liang, Shaofeng Zhang, Xuesong Xu, Zhenyuan Li, Ling Li, Yonghong Shao, Shuangchen Ruan, Wenfei Zhang
Summary: This study successfully prepared red emissive carbon dots with high quantum yield, attributed to their high oxidation degree and high ratio of hydroxyl functional groups on the surface. Utilizing these carbon dots, red emissive random lasing output was achieved at room temperature, and the transformation of random lasing to Fabry-Perot lasing was observed at high temperatures.
Article
Instruments & Instrumentation
Zhuoyue Li, Zengling Ran, Xianguo Qing, Zhengxi He, Yaqin Xiao, Tingting Yang, Xiu He, Jialiang Zhu, Peng He, Sijie Xu
Summary: The study found that the pressure sensitivity of FP sensors remained stable after irradiation, while the temperature sensitivity of FBG sensors was unstable and requires further research. This suggests the potential application of FP sensors in gamma radiation environments.
Article
Engineering, Electrical & Electronic
Praveen Kumar Revuri, Konrad Walus, Vincent P. Wallace, K. K. M. B. Dilusha Silva, Adrian Keating, Lorenzo Faraone, Mariusz Martyniuk
Summary: This work demonstrates the fabrication and evaluation of Fabry-Perot interferometers (FPIs) in the terahertz range using 3D printing. The 3D printed FPIs exhibit low cost, rapid prototyping, and repeatability. Transmission measurements show good agreement with simulated response, and the achieved spectral performance is sufficient for many applications in the terahertz range.
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
(2022)
Article
Engineering, Electrical & Electronic
Rodolfo Martinez-Manuel, Jonathan Esquivel-Hernandez, Sophie LaRochelle
Summary: A novel method is presented to reduce the nonlinearity effect of a wavelength scanning diode laser in a low-reflectivity Fabry-Perot interferometer. The proposed method improves system resolution and achieves a temperature insensitive sensing system. It is demonstrated by measuring the thermo-optic coefficient of liquid samples and presenting long-term performance experimental results.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Multidisciplinary
Nicolas Riesen, Nicholas Phillips, Linh Nguyen, Stephen C. Warren-Smith, Craig Priest, David G. Lancaster
Summary: This paper provides an analysis of fiber-optic Fabry-Perot interferometers using collimating graded-index fiber tips instead of standard single-mode fibers. It shows that the use of collimated GIF tips can significantly increase fringe visibility at 1550 nm. The study also explores the effects of using capillaries to align the fibers and offers easily accessible design guidelines for fabricating GIF-based devices at 1550 nm.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Optics
Jonathan Musgrave, Shu-Wei Huang, Mingming Nie
Summary: Optical frequency combs, especially microcombs generated from fiber Fabry-Perot microresonators, have significant applications in science and technology. They offer compact size, low cost, high-energy efficiency, and large comb spacing, making them attractive for various fields.
Article
Nanoscience & Nanotechnology
Serkan Sirt, Emre Iren, Deniz Eksi, Aylin Yildiz Tunali, Eren Guvenilir, Enver M. Kendirlik, Nissim Ofek, Vladimir Umansky, Stefan Ludwig, Afif Siddiki
Summary: Here we discuss the effect of topology on the quantum Hall effect, considering the direct Coulomb interactions and two distinct geometries. We show that the local distributions and compressibility of the electron number density, electrochemical potential, and current depend on electron-electron interactions. Our experimental results contradict the standard explanation and confirm the presence of incompressible regions in a compressible state.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Physics, Multidisciplinary
Amrita Ghosh, Eytan Grosfeld
Summary: This study investigates the phases of hard-core bosons with weak topological insulator characteristics, highlighting their behavior at different densities. Results show the potential for experimental realization of both weak topological insulators at 1/4 and 3/4 densities, as well as charge-density-wave insulators at 1/2 filling, providing new directions for optical lattice experiments.
Article
Multidisciplinary Sciences
Asaf Rozen, Jeong Min Park, Uri Zondiner, Yuan Cao, Daniel Rodan-Legrain, Takashi Taniguchi, Kenji Watanabe, Yuval Oreg, Ady Stern, Erez Berg, Pablo Jarillo-Herrero, Shahal Ilani
Summary: The study reveals a transition from a low-entropy electronic liquid to a high-entropy correlated state in magic-angle twisted bilayer graphene under the influence of electron density, temperature, and magnetic field. The correlated state demonstrates a unique combination of properties associated with itinerant electrons and localized moments, with distinct energy scales for different characteristics. The hybrid nature of the correlated state and the separation of energy scales have significant implications for the thermodynamic and transport properties of twisted bilayer graphene.
Review
Nanoscience & Nanotechnology
Karsten Flensberg, Felix von Oppen, Ady Stern
Summary: Topological qubits are a promising method for storing quantum information in a topologically protected manner, but are difficult to realize. Recent research has focused on combining superconductivity, spin-orbit coupling, and a magnetic field to achieve this goal, with the Majorana-based approach being at the forefront of these efforts.
NATURE REVIEWS MATERIALS
(2021)
Article
Physics, Multidisciplinary
Ari M. Turner, Erez Berg, Ady Stern
Summary: In this study, the stability of fragile topological bands protected by space-time inversion symmetry under strong electron-electron interactions is investigated. It is found that when these fragile bands are half filled, interactions can open a gap in the many-body spectrum without breaking any symmetry or mixing degrees of freedom from remote bands. The resulting ground state is not topologically ordered. The formation of fermionic bound states known as trions is crucial for this result, which may be relevant to recent experiments in magic angle twisted bilayer graphene at charge neutrality.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Bivas Dutta, Wenmin Yang, Ron Melcer, Hemanta Kumar Kundu, Moty Heiblum, Vladimir Umansky, Yuval Oreg, Ady Stern, David Mross
Summary: Quantum Hall states have unique quantum phases characterized by gapless edge modes. The most studied nonabelian state is the spin-polarized filling factor 5/2, which can have different topological orders. By interfacing this state with another, we were able to identify its topological order as the particle-hole Pfaffian (PH-Pf) order.
Article
Physics, Applied
Paul Brookes, Tikai Chang, Marzena Szymanska, Eytan Grosfeld, Eran Ginossar, Michael Stern
Summary: Symmetry considerations play a crucial role in understanding the fundamental laws of nature and can protect quantum information from relaxation and decoherence.
PHYSICAL REVIEW APPLIED
(2022)
Article
Quantum Science & Technology
Daniel Dahan, Geva Arwas, Eytan Grosfeld
Summary: This study investigates the dissipative Bose-Hubbard model with chiral drive on a small ring of sites, exploring its long-time dynamical structure using mean-field equations and simulating the quantum master equation. The findings reveal that for sufficiently large drivings, the system exhibits a chaotic attractor at the mean-field level, presenting as a complex Wigner function at the quantum level. This behavior can be observed through the measurement of various bosonic correlation functions.
NPJ QUANTUM INFORMATION
(2022)
Article
Multidisciplinary Sciences
C. Kumar, J. Birkbeck, J. A. Sulpizio, D. Perello, T. Taniguchi, K. Watanabe, O. Reuven, T. Scaffidi, Ady Stern, A. K. Geim, S. Ilani
Summary: Recent research has shown that hydrodynamic electronic phenomena can transcend the fundamental limitations of ballistic electrons, with important implications for fundamental science and future technologies. High-mobility graphene Corbino disk devices were used to image single-electron-transistor electronic flow, revealing the elimination of bulk Landauer-Sharvin resistance by electron hydrodynamics. This study highlights the potential of electronic fluids to revolutionize electronic conduction.
Article
Multidisciplinary Sciences
A. Inbar, J. Birkbeck, J. Xiao, T. Taniguchi, K. Watanabe, B. Yan, Y. Oreg, Ady Stern, E. Berg, S. Ilani
Summary: The invention of the quantum twisting microscope (QTM) allows for direct observation of key quantum properties of electronic systems. By creating pristine two-dimensional junctions and using a unique van der Waals tip, the QTM enables local interference experiments at its tip, providing a multitude of interfering paths for electrons to tunnel into a sample. Through various experiments, the QTM demonstrates room-temperature quantum coherence, studies the evolution of twist angles in twisted bilayer graphene, images the energy bands of monolayer and twisted bilayer graphene, and visualizes the flattening of the low-energy band of twisted bilayer graphene under local pressure. The QTM opens up new possibilities for studying quantum materials.
Article
Physics, Multidisciplinary
Shimon Arie Haver, Eran Ginossar, Sebastian E. de Graaf, Eytan Grosfeld
Summary: This study explores the potential of superconducting resonators as detectors for topological insulator nanowires by generating orbital resonances through the introduction of static and oscillating electromagnetic fields. The changes in the resonator's Q-factor as a function of the flux reveal the density of states, transition rules, and dependence on the applied flux of the surface 2D Dirac orbitals in the topological insulator nanowire.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Multidisciplinary
Devendra Singh Bhakuni, Amrita Ghosh, Eytan Grosfeld
Summary: This study explores the effect of many-body interactions in mirror-symmetry protected topological crystalline insulators. It demonstrates the stability of the mirror-symmetry protected topological phase under short-range interactions and the interaction-induced topological phase transition when longer-range interactions are introduced.
SCIPOST PHYSICS CORE
(2022)
Article
Materials Science, Multidisciplinary
Ruchi Saxena, Eytan Grosfeld, Sebastian E. de Graaf, Tobias Lindstrom, Floriana Lombardi, Oindrila Deb, Eran Ginossar
Summary: We analyze the confinement of electronic surface states in a model of a topological insulator nanowire. We show that intentional backscattering can be induced in the presence of a nanowire constriction and propose a geometry involving two constrictions that form effective barriers for the formation of a quantum dot. By analyzing the noninteracting electronic transport through the device, we demonstrate how externally applied magnetic flux and electrostatic gates can control the spectrum of the quantum dot and the electronic transport through the surface states of the model device.
Article
Quantum Science & Technology
E. Lupo, E. Grosfeld, E. Ginossar
Summary: We propose a voltage gate-based method for controlling the Majorana transmon and analyze its performance in terms of qubit control errors and charge noise effects. The results show that the method achieves high-fidelity single-qubit rotation gates in both the laboratory frame and the qubit rotating frame. Furthermore, the system exhibits long dephasing times at the sweet spots and remarkable resilience to charge noise in the driven case.
Article
Materials Science, Multidisciplinary
Ohad Antebi, Ady Stern, Erez Berg
Summary: Three symmetries prevent a twisted bilayer of graphene from developing an in-plane spontaneous magnetization in the absence of a magnetic field. Experimental and theoretical indications suggest that these symmetries may be broken spontaneously under certain conditions. In such cases, the in-plane orbital magnetization serves as a sensitive probe for detecting the simultaneous breaking of these three symmetries.
Article
Materials Science, Multidisciplinary
Amrita Ghosh, Eytan Grosfeld
Summary: Through the use of QMC technique, it was discovered that hard-core bosons on the honeycomb lattice exhibit a dimer insulator phase near maximum anisotropy, characterized by a topological entanglement entropy ln(2)/2, indicative of a fractional quantum Hall state. The presence of edge states was identified, and a QMC-based method was derived to extract and verify their chirality, all without the need for magnetic flux or lattice frustration.
