Zobrazeno 1 - 10
of 415
pro vyhledávání: '"Portnoi M"'
We show that a planar array of bipolar waveguides in graphene can be used to engineer gapped and tilted two-dimensional Dirac cones within the electronic band structure. The presence of these gapped and tilted Dirac cones is demonstrated through a su
Externí odkaz:
http://arxiv.org/abs/2411.19226
We derive the angular generation density of photoexcited carriers in gapless and gapped Bernal bilayer graphene. Exploiting the strong anisotropy of the band structure of bilayer graphene at low energies due to trigonal warping, we show that charge c
Externí odkaz:
http://arxiv.org/abs/2409.08807
Autor:
Hartmann, R. R., Portnoi, M. E.
We show that the (2+1)-dimensional massless Dirac equation, which includes a tilt term, can be reduced to the biconfluent Heun equation for a broad range of scalar confining potentials, including the well-known Morse potential. Applying these solutio
Externí odkaz:
http://arxiv.org/abs/2402.08600
Well-known Mott's formula links the thermoelectric power characterised by Seebeck coefficient to conductivity. We calculate analytically the thermoelectric current and Seebeck coefficient in one-dimensional systems and show that, while the prediction
Externí odkaz:
http://arxiv.org/abs/2401.03721
Autor:
Downing, C. A., Portnoi, M. E.
Publikováno v:
Encyclopedia of Condensed Matter Physics (Second Edition) Volume 2, 2024, Pages 344-349
In Westminster Abbey, in a nave near to Newton's monument, lies a memorial stone to Paul Dirac. The inscription on the stone includes the relativistic wave equation for an electron: the Dirac equation. At the turn of the 21st century, it was discover
Externí odkaz:
http://arxiv.org/abs/2312.13748
Publikováno v:
Phys. Rev. Lett. 132, 056902 (2024)
We synthesize a thin film composed of long carbyne chains terminated by gold clusters and study its optical properties. The presence of gold particles stabilizes longer chains and leads to their alignment. We show that the gold clusters also act as a
Externí odkaz:
http://arxiv.org/abs/2310.00643
We employ a tight-binding model to calculate the optical selection rules of gold-terminated carbyne chains in the presence of an applied electric field. We show that both the magnitude of the edge-state gap and the strength of optical transitions acr
Externí odkaz:
http://arxiv.org/abs/2309.00288
Publikováno v:
Scientific Reports 13, 19211 (2023)
Two-dimensional semimetals with tilted Dirac cones in the electronic band structure are shown to exhibit spatial separation of carriers belonging to different valleys under illumination. In stark contrast to gapped Dirac materials this optovalleytron
Externí odkaz:
http://arxiv.org/abs/2301.04564
Publikováno v:
Phys. Rev. B 106, L041403 (2022)
We develop an analytic model for an ideal polyyne ring which describes the induced THz gap in the molecular spectrum due to the Stark effect. This simple model can also be used to describe an odd-dimered cyclocarbon which has undergone a spontaneous
Externí odkaz:
http://arxiv.org/abs/2202.01568
Publikováno v:
Phys. Rev. B 105, 205306 (2022)
The interband optical absorption of linearly polarised light by two-dimensional (2D) semimetals hosting tilted and anisotropic Dirac cones in the bandstructure is analysed theoretically. Super-critically tilted (type-II) Dirac cones are characterised
Externí odkaz:
http://arxiv.org/abs/2112.00542