Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session F33: Transport and Dynamics in Quantum Devices |
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Sponsoring Units: DCMP Chair: Robert Moore, Oak Ridge National Lab Room: Room 225 |
Tuesday, March 7, 2023 8:00AM - 8:12AM |
F33.00001: RF- Transport through a Hall Bar coupled to microwave resonators. PARAS SETH We present here the Radio frequency transport through a Hall Bar from large filling factors to uptill 2. The Hall Bar is made on GaAs-GaAlAs heterostructure two dimensional electron gas.We experimentally study the impedance of this hall bar at radio frequencies (C-Band [4-8 GHz]) . The Hall Bar has two resonators(metallic planar Coils of gold) in series resonating at 5GHz and having a bandwidth of 450MHz, providing better coupling to the sample at high magnetic fields( large hall resistance- 25.8 kilo?). This info is then used to measure high-frequency (f>>kT) Shot noise from a quantum point contact deposited on top of 2DEG and Dynamical Coulomb Blockade effects are observed. Dwell time effects of charge carriers are probed in these measurements. |
Tuesday, March 7, 2023 8:12AM - 8:24AM |
F33.00002: Mesoscopic Heat 'Multiplier' - A Quantum Hall device revealing correlated States Florian Stäbler Local measurements of the heat flux in Quantum Hall devices can differ from the expected equilibrium heat flux due to interactions. We model a simple mesoscopic device, consisting of ohmic reservoirs connected via chiral edge states. In an internal edge state of the device, the interaction between the reservoirs leads to extra correlations adding to the, locally measured, equilibrium heat flux. We investigate how these correlated states can be detected, discuss their thermometry and how one could reveal their nature experimentally through interference experiments or cross correlation measurements. |
Tuesday, March 7, 2023 8:24AM - 8:36AM |
F33.00003: Non-Reciprocal Supercurrents in a Field-Free Graphene Josephson Triode John Chiles, Ethan G Arnault, Chun-Chia Chen, Trevyn Larson, Lingfei Zhao, Kenji Watanabe, Takashi Taniguchi, Francois Amet, Gleb Finkelstein Superconducting diodes are proposed non-reciprocal circuit elements that should exhibit nondissipative transport in one direction while being resistive in the opposite direction. Multiple examples of such devices have emerged in the past couple of years, however their efficiency is typically limited, and most of them require magnetic field to function. Here we present a device achieving efficiencies upwards of 90% while operating at zero field. Our samples consist of a network of three graphene Josephson junctions linked by a common superconducting island, to which we refer as a Josephson triode. The triode is tuned by applying a control current to one of the contacts, thereby breaking the time-reversal symmetry of the current flow. The triode's utility is demonstrated by rectifying a small (tens of nA amplitude) applied square wave. We speculate that devices of this type could be realistically employed in the modern quantum circuits. |
Tuesday, March 7, 2023 8:36AM - 8:48AM |
F33.00004: Variational real-time dynamics of Josephson junction arrays Matija Medvidovic, Dries Sels Numerical simulation of quantum systems with continuous degrees of freedom out of equilibrium is a key challenge for modern computational chemistry, optics and materials. We study the case of real-time dynamics of two-dimensional Josephson junction arrays, a vital component of modern quantum computing hardware based on superconducting architectures. Our approach is based on custom neural-network many-body quantum states. We simulate large experimentally-relevant system sizes by representing a trial state in a continuous basis and using state-of-the-art sampling approaches based on Hamiltonian Monte Carlo. Using this method, we observe key phenomena like fidelity decay and vorticity oscillations at long time scales for two-dimensional systems of up to 64 junctions. Our approach can be used for accurate non-equilibrium simulations of continuous systems at previously unexplored system sizes and evolution times, bridging the gap between simulation and experiment. |
Tuesday, March 7, 2023 8:48AM - 9:00AM |
F33.00005: Finite frequency measurement of the third moment of current noise in a tunnel junction Clovis Farley We report the first measurment of the third moment of current noise (2(f)i(-2f)>) in a mesoscpic device in a fully quantum regime (hf>>eV,kT). This is achieved by using a tunnel junction in a dilution refrigator (T=10mK) in the microwave regime (f=5GHz). The contribution from feedback effects and correlations induced by environnmental noise are both accounted for quantitatively. The noise susceptibility, the response of the current statistics to a fluctuating voltage, is also measured and corresponds exactly to theoritical predictions. |
Tuesday, March 7, 2023 9:00AM - 9:12AM Author not Attending |
F33.00006: Quantum Enhancement of the Spin-Thermopower in Single-Molecule Junctions Justin P Bergfield The thermoelectric effect allows heat to be directly converted into electricity in a device with no moving parts. In systems with broken time-reversal symmetry, a spin-voltage may be generated in response to a temperature gradient via the spin-dependent Seebeck effect. We derive expressions for the linear-response spin-dependent transport in interacting nanostructures and apply them to investigate the thermoelectric and thermodynamic response of single-molecule junctions with destructive quantum interference features (nodes) in a channel of their transmission spectrum. When the spin-splitting is sufficient a pure spin-thermopower twice that of the charge thermopower is predicted. The importance of manybody correlations and dephasing as well as the connection of these results to information theory are investigated. |
Tuesday, March 7, 2023 9:12AM - 9:24AM |
F33.00007: Electrical and optical manipulation of telecom band Si color centers in p-i-n light emitting diode like structures Kaushalya Jhuria, Arun Persaud, Qing Ji, Wei Liu, Walid Redjem, Yertay Zhiyenbayev, Christos Papapanos, Zhihao Qin, Sara Saib, Vsevolod Ivanov, Vincent Bagnoud, Johannes Hornung, Pascal Boller, Xinran Li, Lieselotte Obst-Huebl, Liang Tan, Boubacar Kante, Thomas Schenkel We report the electrical and optical manipulation of telecom band color centers in a Si based p-i-n type light emitting diode (LED) structure that was fabricated using laser-plasma driven ion implantation. In this approach, a petawatt laser is employed to generate a high flux, high energy beam of B ions which are used to dope an n-type Si substrate (~1.4x1022 B/cm3 observed). Photoluminescence and electroluminescence from W, G and C centers were observed on the same sample at the same spot along with first experimental observation of Stark shift from W center while the device was under reverse bias. This would enable electrical control of resonance between quantum emitter and photonic crystal cavity. This new ion implantation approach not only allows fabrication of LED type structures in a single step but also forms the color centers without the requirement of post implantation annealing due to its dual pulse behavior. Silicon doped with high concentrations of B can also form a superconducting phase and we will also present results from temperature dependent resistivity measurements. |
Tuesday, March 7, 2023 9:24AM - 9:36AM |
F33.00008: Electrically controlled spin mechanical coupling in a carbon nanotube resonator Federico Fedele, Federico Cerisola, Léa Bresque, Kushagra Aggarwal, Jorge Tabanera, Juliette Monsel, Alexia Auffèves, Juan M Rodríguez Parrondo, Janet Anders, András Pályi, Natalia Ares Coupling of a quantum system like a single spin to a mechanical resonator has many interesting applications in classical and quantum information processing, as well as sensing, long-distance spin-spin coupling, and investigating motion at the quantum limit. |
Tuesday, March 7, 2023 9:36AM - 9:48AM |
F33.00009: Phonon Transport in Surface-disordered Nanowires with Temperature Gradient Yuan Gao, Khandker A Muttalib One idea to improve the efficiency of thermoelectric nano-devices is decreasing the heat current by using nanowires with surface disorder. However, the influence of surface disorder on phonon transport is still unclear. We start from an exact mapping from a nanowire with a rough surface to a nanowire with smooth surface with additional pseudo-potential and expand the pseudopotential term systematically. The terms generated are typically either a shift, a dilation, or both and lead to scattering of the propagating phonon from these surface-disorder generated frequency and momentum dependent anharmonic phonons. In addition, in a thermoelectric device, the wire is connected to hot and cold leads with fixed temperatures. We then go beyond the effects of surface disorder and develop a framework to study non-equilibrium thermal current in the presence of large temperature differences across the wire that leads to a temperature gradient within the wire. We apply another exact mapping from a nanowire with a temperature gradient to a nanowire with uniform temperature with additional pseudo-potential, which can also be described as various momentum and frequency dependent anharmonic phonons interacting with the propagating phonons across the wire in the standard field-theory language. There are unusual temperature-dependent contributions that do not exist in the current field-theory formulation. |
Tuesday, March 7, 2023 9:48AM - 10:00AM Author not Attending |
F33.00010: Magnetoconductivity of Semiconducting Wires with Rashba-Dresselhaus Interaction in an Axial Magnetic Field Abhishek Khanal, D. C Marinescu We present the weak localization (WL) corrections to the magnetoconductivity of two dimensional electron gas with spin-orbit coupling encapsulated in a tubular structure placed in an axial magnetic field. For arbitrary values of the Rashba α and Dresselhaus β coupling constants, analytic results are obtained for two different models: electron gas wrapped around a cylindrical core and the diagonal part of the exact Hamiltonian associated with the [111] growth direction, instances where electron eigenvalues can be computed non-numerically. In both cases, since the axial symmetry is preserved, the weak localization terms are periodic functions of the magnetic flux. Side by side comparisons between the two models are provided for the same values of the two coupling constants. |
Tuesday, March 7, 2023 10:00AM - 10:12AM |
F33.00011: Hybrid normal-superconducting Aharonov-Bohm quantum thermal device Gianmichele Blasi, Francesco Giazotto, Géraldine Haack We propose and theoretically investigate the behavior of a ballistic Aharonov-Bohm (AB) ring when embedded in a N-S two-terminal setup, consisting of a normal metal (N) and superconducting (S) leads. This device is based on available current technologies and we show in this work that it constitutes a promising hybrid quantum thermal device, as a quantum heat engine and quantum thermal rectifier. Remarkably, we evidence the interplay of single-particle quantum interferences in the AB ring and of the superconducting properties of the structure to achieve the hybrid operating mode for this quantum device. Its efficiency as a quantum heat engine reaches 55% of the Carnot efficiency, and we predict thermal rectification factor attaining 350%. These predictions make this device highly promising for future phase-coherent caloritronic nanodevices. |
Tuesday, March 7, 2023 10:12AM - 10:24AM |
F33.00012: Thermal transport in devices cooled below 10 millikelvin by on-chip demagnetisation Richard P Haley, Samuli Autti, Francis C Bettsworth, Kestutis Grigoras, David Gunnarsson, Alexander T Jones, Yuri A Pashkin, Jonathan R Prance, Mika Prunnila, Michael D Thompson, Dmitry E Zmeev Significant progress has recently been made using the magnetic refrigeration of material deposited on-chip to cool the electrons in micro- and nanoelectronic devices into the sub-mK regime [1,2,3]. This provides a low-investment technique for going beyond the off-chip temperatures provided by dilution fridges. Achieving sub-millikelvin electron temperatures reduces noise and enhances sensitivity for observing known and new physical phenomena, in turn improving the performance of quantum technologies, sensors and metrological standards. Typically, off-chip cooling below 10 mK cooling is limited by weak electron-phonon coupling, set against the heat leak in the electronic system from measurement leads and the environment. Here we report on our work to understand the relative importance of cooling on-chip and off-chip components and the thermal subsystem dynamics [4]. We measure and simulate the behaviour of a Coulomb blockade thermometer with on-chip copper refrigerant. Our model can be used to optimise the design and measurement of devices which exploit these cooling techniques. |
Tuesday, March 7, 2023 10:24AM - 10:36AM |
F33.00013: Reversible and irreversible flows of heat and charge in a quantum thermocouple Charles A Stafford, Marco A Jimenez Valencia The full non-linear electric and heat currents of a non-equilibrium quantum system consisting of two quantum dots threaded by a magnetic flux and coupled to three macroscopic electron reservoirs are analyzed in the context of its thermoelectricity. An apparent thermodynamic paradox is resolved by careful examination and distinction of the currents present in the system. Novel relationships among the linear response coefficients for three terminal systems are obtained and interpreted. Expressions for heat and particle currents in steady state in the system are derived by using the Non Equilibrium Green’s Function theory (NEGF) and are examined numerically. |
Tuesday, March 7, 2023 10:36AM - 10:48AM |
F33.00014: Strange kinetics of heat transfer Zheng Kaikai, Ruoyu Dong, Shankar Ghosh, Steve Granick "Anomalous" forms of mass diffusion are accepted facts and their understanding occupies a large branch of applied physical science, but violations of Fourier's law of diffusive heat conduction is believed to happen only at the nanoscale. Testing this proposition using a homebuilt setup to map the surface temperature of polymer materials in vacuum, our independent measurements using IR camera, thermocouples and thermochromic liquid crystals find consistent deviations also at the macroscale. |
Tuesday, March 7, 2023 10:48AM - 11:00AM |
F33.00015: Heat transport and rectification via quantum statistical and coherence asymmetries Ricardo Román Ancheyta Recent experiments at the nanoscales confirm that thermal rectifiers, the thermal equivalent of electrical diodes, can operate in the quantum regime. We present a thorough investigation of the effect of different particle exchange statistics, coherence, and collective interactions on the quantum heat transport of rectifiers with two-terminal junctions. Using a collision model approach to describe the open system dynamics, we obtain a general expression of the nonlinear heat flow that fundamentally deviates from the Landauer formula whenever quantum statistical or coherence asymmetries are present in the bath particles. Building on this, we show that heat rectification is possible even with symmetric medium-bath couplings if the two baths differ in quantum statistics or coherence. Furthermore, the associated thermal conductance vanishes exponentially at low temperatures as in the Coulomb-blockade effect. However, at high temperatures it acquires a power-law behavior depending on the quantum statistics. Our results can be significant for heat management in hybrid open quantum systems or solid-state thermal circuits. |
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