scispace - formally typeset

Topic

Quantum tunnelling

About: Quantum tunnelling is a(n) research topic. Over the lifetime, 24431 publication(s) have been published within this topic receiving 579635 citation(s). The topic is also known as: tunneling effect & tunnel effect.
Papers
More filters

Book
Supriyo Datta1Institutions (1)
01 Jan 1995
Abstract: 1. Preliminary concepts 2. Conductance from transmission 3. Transmission function, S-matrix and Green's functions 4. Quantum Hall effect 5. Localisation and fluctuations 6. Double-barrier tunnelling 7. Optical analogies 8. Non-equilibrium Green's function formalism.

5,433 citations


Supriyo Datta1Institutions (1)
01 May 1997
Abstract: 1. Preliminary concepts 2. Conductance from transmission 3. Transmission function, S-matrix and Green's functions 4. Quantum Hall effect 5. Localisation and fluctuations 6. Double-barrier tunnelling 7. Optical analogies 8. Non-equilibrium Green's function formalism.

4,224 citations


Journal ArticleDOI
Hideo Ohno1Institutions (1)
14 Aug 1998-Science
TL;DR: The magnetic coupling in all semiconductor ferromagnetic/nonmagnetic layered structures, together with the possibility of spin filtering in RTDs, shows the potential of the present material system for exploring new physics and for developing new functionality toward future electronics.
Abstract: REVIEW Semiconductor devices generally take advantage of the charge of electrons, whereas magnetic materials are used for recording information involving electron spin. To make use of both charge and spin of electrons in semiconductors, a high concentration of magnetic elements can be introduced in nonmagnetic III-V semiconductors currently in use for devices. Low solubility of magnetic elements was overcome by low-temperature nonequilibrium molecular beam epitaxial growth, and ferromagnetic (Ga,Mn)As was realized. Magnetotransport measurements revealed that the magnetic transition temperature can be as high as 110 kelvin. The origin of the ferromagnetic interaction is discussed. Multilayer heterostructures including resonant tunneling diodes (RTDs) have also successfully been fabricated. The magnetic coupling between two ferromagnetic (Ga,Mn)As films separated by a nonmagnetic layer indicated the critical role of the holes in the magnetic coupling. The magnetic coupling in all semiconductor ferromagnetic/nonmagnetic layered structures, together with the possibility of spin filtering in RTDs, shows the potential of the present material system for exploring new physics and for developing new functionality toward future electronics.

4,189 citations


Journal ArticleDOI
Abstract: The so-called Klein paradox—unimpeded penetration of relativistic particles through high and wide potential barriers—is one of the most exotic and counterintuitive consequences of quantum electrodynamics. The phenomenon is discussed in many contexts in particle, nuclear and astro-physics but direct tests of the Klein paradox using elementary particles have so far proved impossible. Here we show that the effect can be tested in a conceptually simple condensed-matter experiment using electrostatic barriers in single- and bi-layer graphene. Owing to the chiral nature of their quasiparticles, quantum tunnelling in these materials becomes highly anisotropic, qualitatively different from the case of normal, non-relativistic electrons. Massless Dirac fermions in graphene allow a close realization of Klein’s gedanken experiment, whereas massive chiral fermions in bilayer graphene offer an interesting complementary system that elucidates the basic physics involved.

3,134 citations


Journal ArticleDOI

3,068 citations


Network Information
Related Topics (5)
Band gap

86.8K papers, 2.2M citations

88% related
Silicon

196K papers, 3M citations

87% related
Electron

111.1K papers, 2.1M citations

85% related
Thin film

275.5K papers, 4.5M citations

85% related
Amorphous solid

117K papers, 2.2M citations

84% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202213
2021487
2020560
2019606
2018614
2017684