Results 151 to 160 of about 1,987,784 (294)

Oscillator tunneling dynamics in the Rabi model

, 2014
Funding support from the National Science Foundation and the Leverhulme Trust is acknowledged.The familiar Rabi model, comprising a two-level system coupled to a quantum harmonic oscillator, continues to produce rich and surprising physics when the ...
Gea-Banacloche, J., Irish, E. K., Twyeffort Irish, E.K.   +2 more
core   +1 more source

Advances and Perspectives in Graphene‐Based Quantum Dots Enabled Neuromorphic Devices

Advanced Science, EarlyView.
Graphene‐based QDs are zero‐dimensional carbon nanomaterials with pronounced quantum confinement and tunable electronic structures. Herein, we summarize their synthesis strategies and functionalization methods, and highlight their functional roles and operating mechanisms in devices, as well as recent advances in neuromorphic electronics. We anticipate
Yulin Zhen, Wei Zeng, Zherui Zhao, JiYu Zhao, Ziyan Huang, Zhuo Chen, Kui Zhou, Guanglong Ding, Su‐Ting Han, Ye Zhou   +9 more
wiley   +1 more source

Keldysh crossover in one-dimensional Mott insulators

APL Materials
Recent advancements in pulse laser technology have facilitated the exploration of nonequilibrium spectroscopy of electronic states in the presence of strong electric fields across a broad range of photon energies.
Kazuya Shinjo, Takami Tohyama
doaj   +1 more source

Buried Unstrained Germanium Channels: A Lattice‐Matched Platform for Quantum Technology

Advanced Science, EarlyView.
ABSTRACT Strained germanium (ε$\varepsilon$‐Ge) and strained silicon (ε$\varepsilon$‐Si) buried quantum wells have enabled advanced spin‐qubit quantum processors. However, in the absence of suitable lattice‐matched substrates, ε$\varepsilon$‐Ge and ε$\varepsilon$‐Si are deposited on defective, metamorphic SiGe buffers, which may impact device ...
Davide Costa, Patrick Del Vecchio, Karina Hudson, Lucas E. A. Stehouwer, Alberto Tosato, Davide Degli Esposti, Vladimir Calvi, Luca Moreschini, Mario Lodari, Stefano Bosco, Giordano Scappucci   +10 more
wiley   +1 more source

Quantum tunneling through graphene nanorings

, 2010
We investigate theoretically quantum transport through graphene nanorings in the presence of a perpendicular magnetic field. Our theoretical results demonstrate that the graphene nanorings behave like a resonant tunneling device, contrary to the Aharonov-
Chang K (Chang Kai), Zhang ZZ (Zhang Z. Z.), Peeters FM (Peeters F. M.), Wu, ZH, Chinese Acad Sci, Inst Semicond, SKLSM, POB 912, Beijing 100083, Peoples R China. 电子邮箱地址: kchang@red.semi.ac.cn, Wu ZH (Wu Zhenhua)   +4 more
core  

Room temperature quantum tunneling and Coulomb blockade in silicon-rich oxide [PDF]

, 2008
We studied the electrical properties of silicon nanocrystals (Si-ncs) with a wide size distribution embedded in an oxide matrix. A wide Coulomb gap, clear current bumps, and significant current oscillations and jumps were observed at room temperature in ...
ZHENRUI YU, MARIANO ACEVES MIJARES, KARIM MONFIL LEYVA, Fuzhong Wang   +3 more
core  

QUANTUM TUNNELING AND NEGATIVE EIGENVALUES

Nuclear Physics B, 1988
Abstract In the path-integral approach to the decay of a metastable state by quantum tunneling, the tunneling process is dominated by a solution to the imaginary-time equations of motion, called the bounce. In all known cases, the second variational derivative of the euclidean action at the bounce has one and only one negative eigenvalue.
openaire   +1 more source

Ultrathin Quasi‐2D Perovskite‐Organic Segregated‐Structure Coupling for High‐Performance Narrowband Photomultiplication Detectors

Advanced Science, EarlyView.
Quasi‐2D perovskite‐organic segregated‐structure coupling enables low‐power narrowband photomultiplication photodetectors with 110 nm perovskite layer. The optimal device achieves 1200% EQE and 1.82 × 1011 Jones D* at 3 V, offering a new strategy for miniaturized high‐selectivity optoelectronic sensing.
Hongfei Qu, Peng He, Xingchao Zhao, Yongchao Xie, Fulong Huang, Xiaoling Ma, Byung Hui Lee, Han Young Woo, Yumeng Shi, Zuliang Zhuo, Fujun Zhang, Xixiang Zhu   +11 more
wiley   +1 more source

Logical stochastic resonance with a coulomb-coupled quantum-dot rectifier

, 2015
The authors gratefully acknowledge financial support from the European Union (FPVII, 2007-2013) under Grant Agreement No. 256959 NANOPOWER and Grant Agreement No. 318287 LANDAUER.Noise is mostly considered to be an adverse factor in electronics.
Hartmann, F., Worschech, L., Pfeffer, P., Hoefling, S., Kamp, M.   +4 more
core   +1 more source

Defect‐Functionalization‐Mediated Tunneling Drives Nonlinear Photoemission in Perovskites

Advanced Science, EarlyView.
This cover illustration depicts CsPbBr3 perovskite nanocrystals embedded with functionalized defect vacancies, where electrons migrate through defect‐mediated pathways and emit as lightning‐like beams. The imagery visualizes the core discovery of our work—defect‐functionalization‐mediated tunneling enabling nonlinear photoemission, where deep‐level ...
Hang Ren, Xi Zhang, Yicheng Wang, Shuai Wang, Zhi Wang, Yumeng Li, Jikai Yang, Xin Wang, Weijun Chen, Yining Mu   +9 more
wiley   +1 more source