Results 71 to 80 of about 1,855,980 (368)

Non-KAM classical chaos topology for electrons in superlattice minibands determines the inter-well quantum transition rates

Scientific Reports
We investigate the quantum-classical correspondence for a particle tunnelling through a periodic superlattice structure with an applied bias voltage and an additional tilted harmonic oscillator potential.
F. Wang, M. T. Greenaway, A. G. Balanov, T. M. Fromhold   +3 more
doaj   +1 more source

Quantum and Classical Dissipative Effects on Tunnelling in Quantum Hall Bilayers

, 2005
We discuss the interplay between transport and dissipation in quantum Hall bilayers. We show that quantum effects are relevant in the pseudospin picture of these systems, leading either to direct tunnelling currents or to quantum dissipative processes ...
A. V. Chubukov, C. M. Bender, Derek K. K. Lee, Nigel R. Cooper, Robert L. Jack, S. M. Girvin, T. Nakajima, Z. F. Ezawa   +7 more
core   +1 more source

Quantum tunnelling and decoherence in nanomagnets [PDF]

, 2006
Starting from the observation that at very low temperatures an isolated nanomagnet can be treated as an effective two-state system, we introduce a model to study quantum tunnelling and decoherence phenomena.
Bozat, Ozgur, Bozat, Özgür, Gedik, Zafer   +2 more
core   +1 more source

Photoactivation of NV Centers in Diamond via Continuous Wave Laser Illumination of Shallow As‐Implanted Nitrogen

Advanced Functional Materials, EarlyView.
This study demonstrates an alternative method of creating charge‐stable negatively charged nitrogen vacancy (NV−) centers close to the diamond surface without high‐temperature annealing. By illuminating nitrogen‐implanted regions with a continuous‐wave 405 nm laser, NV− centers are induced, exhibiting electron spin coherence properties suitable for ...
Jens Fuhrmann, Christoph Findler, Michael Olney‐Fraser, Lev Kazak, Fedor Jelezko   +4 more
wiley   +1 more source

Quantum tunnelling of magnetization in Mn12-ac studied by 55Mn NMR

, 2002
We present an ultra-low temperature study (down to T = 20 mK) of the nuclear spin-lattice relaxation (SLR) in the 55Mn nuclei of the molecular magnet Mn12-ac.
A. Morello, Bokacheva, Chiorescu, Chudnovsky, Friedman, Furukawa, H.B. Brom, Kubo, L.J. de Jongh, Lascialfari, Leuenberger, O.N. Bakharev, Prokof'ev, Suter, Takeda, Thomas, Ueda, Wernsdordfer   +17 more
core   +1 more source

Effects of the generalised uncertainty principle on quantum tunnelling [PDF]

, 2015
In a previous paper (Blado et al 2014 Eur. J. Phys. 35 065011), we showed that quantum gravity effects can be discussed with only a background in non-relativistic quantum mechanics at the undergraduate level by looking at the effect of the generalised ...
G. Blado, Trevor Prescott, J. Jennings, Joshuah Ceyanes, Rafael Sepúlveda   +4 more
semanticscholar   +1 more source

Pentagonal 2D Altermagnets: Material Screening and Altermagnetic Tunneling Junction Device Application

Advanced Functional Materials, EarlyView.
From a database of 170 pentagonal 2D materials, 4 candidates exhibiting altermagnetic ordering are screened. Furthermore, the spin‐splitting and unconventional boundary states in the pentagonal 2D altermagnetic monolayer MnS2 are investigated. A MnS2‐based altermagnetic tunneling junction is designed and, through ab initio quantum transport simulations,
Jianhua Wang, Xingyue Yang, Zongmeng Yang, Jing Lu, Pin Ho, Wenhong Wang, Yee Sin Ang, Zhenxiang Cheng, Shibo Fang   +8 more
wiley   +1 more source

Macroscopic quantum tunnelling of a Bose-Einstein condensate in a Cubic-Plus-Quadratic Well

AAPPS Bulletin
We study the macroscopic quantum tunnelling of an interacting Bose-Einstein condensate in a cubic-plus-quadratic well that was approximately realized in recent experiment.
Rui-Bin Liu, Mingyang Liu, Shizhong Zhang   +2 more
doaj   +1 more source

Conformation-driven quantum interference effects mediated by through-space conjugation in self-assembled monolayers

Nature Communications, 2016
Tunnelling currents through molecular junctions are affected by quantum interference effects, but understanding the factors leading to them remains a challenge.
Marco Carlotti, Andrii Kovalchuk, Tobias Wächter, Xinkai Qiu, Michael Zharnikov, Ryan C. Chiechi   +5 more
doaj   +1 more source

Direct Observation of Second Order Atom Tunnelling

, 2007
Tunnelling of material particles through a classically impenetrable barrier constitutes one of the hallmark effects of quantum physics. When interactions between the particles compete with their mobility through a tunnel junction, intriguing novel ...
Bloch, I., Cheinet, P., Feld, M., Foelling, S., Mueller, T., Saers, R., Trotzky, S., Widera, A.   +7 more
core   +1 more source