Zobrazeno 1 - 10
of 101
pro vyhledávání: '"Hartmann, R. R."'
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
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:
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:
Scientific Reports Vol. 12, Article number: 7688 (2022)
We show that if the solutions to the (2+1)-dimensional massless Dirac equation for a given 1D potential are known, then they can be used to obtain the eigenvalues and eigenfunctions for the same potential, orientated at an arbitrary angle, in a tilte
Externí odkaz:
http://arxiv.org/abs/2111.10760
Publikováno v:
Phys. Rev. Research 3, 033202 (2021)
We predict an optical effect associated with systems which exhibit topologically protected states separated by a finite distance. We develop a tight-binding model to calculate the optical selection rules in linear chains of atoms of different lengths
Externí odkaz:
http://arxiv.org/abs/2105.05344
Autor:
Hartmann, R. R., Portnoi, M. E.
Publikováno v:
Phys. Rev. B 102, 155421 (2020)
We show analytically that the ability of Dirac materials to localize an electron in both a barrier and a well can be utilized to open a pseudo-gap in graphene's spectrum. By using narrow top-gates as guiding potentials, we demonstrate that graphene b
Externí odkaz:
http://arxiv.org/abs/2008.11624
Autor:
Hartmann, R. R., Portnoi, M. E.
Publikováno v:
Phys. Rev. A 102, 052229 (2020)
The double-well problem for the two-dimensional Dirac equation is solved for a family of quasi-one-dimensional potentials in terms of confluent Heun functions. We demonstrate that for a double well separated by a barrier, both the energy level splitt
Externí odkaz:
http://arxiv.org/abs/2008.10798