Zobrazeno 1 - 10
of 121
pro vyhledávání: '"Straley, Joseph P."'
Publikováno v:
Physical Review B 109, 075418 (2024)
Coulomb impurity of charge $Ze$ is known to destabilize the ground state of undoped graphene with respect to creation of screening space charge if $Z$ exceeds a critical value of $1/2\alpha$ set by material's fine structure constant $\alpha$. Recent
Externí odkaz:
http://arxiv.org/abs/2309.02199
Autor:
Golden, Matthew D., Straley, Joseph P.
In two dimensions, the average electrical conductance from a point in a percolating network to the network boundary should be related by a conformal transformation to the conductance from one point to another in an unbounded network. We verify that t
Externí odkaz:
http://arxiv.org/abs/2308.05855
Publikováno v:
Phys. Rev. B 105, 054509 (2022)
Wake patterns due to a uniformly traveling source are a result of the resonant emission of the medium's collective excitations. When there exists a frequency range where such excitations possess a negative group velocity, their interference leads to
Externí odkaz:
http://arxiv.org/abs/2106.00821
Autor:
Crawford, C. B., Straley, Joseph P.
We describe an improvement on the magnetic scalar potential approach to the design of an electromagnet, which incorporates the need to wind the coil as a helix. Any magnetic field that can be described by a magnetic scalar potential is produced with
Externí odkaz:
http://arxiv.org/abs/2102.00149
Publikováno v:
Phys. Rev. Lett. 120, 226801 (2018)
The dispersion law for plasma oscillations in a two-dimensional electron gas in the hydrodynamic approximation interpolates between $\Omega \propto \sqrt{q}$ and $\Omega \propto q$ dependences as the wave vector $q$ increases. As a result, downstream
Externí odkaz:
http://arxiv.org/abs/1712.05946
Publikováno v:
Phys. Rev. B 96, 165116 (2017)
A hydrodynamic theory of screening in a generic electron gas of arbitrary dimensionality is given that encompasses all previously studied cases and clarifies the predictions of the many-body approach. We find that long-wavelength plasma oscillations
Externí odkaz:
http://arxiv.org/abs/1706.02233
Publikováno v:
Phys. Rev. B 95, 045415 (2017)
Pristine monolayer graphene exhibits very poor screening because the density of states vanishes at the Dirac point. As a result, charge relaxation is controlled by the effects of zero-point motion (rather than by the Coulomb interaction) over a wide
Externí odkaz:
http://arxiv.org/abs/1610.04053
Publikováno v:
Phys. Rev. B 94, 245150 (2016)
A variety of two-dimensional materials possess a band structure with an energy extremal ridge along a ring in momentum space. Examples are biased bilayer graphene, and surfaces and interfaces with a Rashba spin-orbit interaction where at low doping t
Externí odkaz:
http://arxiv.org/abs/1607.01667
Akademický článek
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Publikováno v:
J. Phys.: Condens. Matter 28 (2016) 47LT01
Undoped bilayer graphene is a two-dimensional semimetal with a low-energy excitation spectrum that is parabolic in the momentum. As a result, the screening of an arbitrary external charge $Ze$ is accompanied by a reconstruction of the ground state: v
Externí odkaz:
http://arxiv.org/abs/1512.08246