77 citations · 282 across the 41 of their papers we have counts for
25 papers · 1 filter
On Three "Anomalous" Measurements of Nonlinear QPC Conductance
Mukunda P. Das, Frederick Green
Practical mesoscopic devices based on quantum point contacts (QPCs) must function at operating point involving large internal driving fields. Experimental evidence has accumulated…
Anomalous Conductance Quantization in the Inter-band Gap of a One-dimensional Channel
Frederick Green, Mukunda P. Das
We report on a striking departure from the canonical step sequence of quantized conductance in a ballistic, quasi-one-dimensional metallic channel. Ideally, in such a structure, ea…
Conductance Anomalies in Quantum Point Contacts and One Dimensional Wires
Mukunda P. Das, Frederick Green
Over the last decade, interest in one-dimensional charge transport has progressed from the seminal discovery of Landauer quantization of conductance, as a function of carrier densi…
Comments on "Ohm's Law Survives to the Atomic Scale" by Weber et al
Mukunda P. Das, Frederick Green
The recent article "Ohm's Law Survives to the Atomic Scale" by Weber et al. [Science 335, 64 (1021)] reveals ohmic transport in quantized P-in-Si wires. We argue that their results…
Nonequilibrium mesoscopic transport: a genealogy
Mukunda P. Das, Frederick Green
Models of nonequilibrium quantum transport underpin all modern electronic devices, from the largest scales to the smallest. Past simplifications such as coarse graining and bulk se…
Mesoscopic transport revisited
Mukunda P. Das, Frederick Green
Having driven a large part of the decade's progress in physics, nanoelectronics is now passing from today's realm of the extraordinary to tomorrow's commonplace. This carries the p…
Dissipation in a quantum wire: fact and fantasy
Mukunda P. Das, Frederick Green
Where, and how, does energy dissipation of electrical energy take place in a ballistic wire? Fully two decades after the advent of the transmissive phenomenology of electrical cond…
Ballistic transport is dissipative: the why and how
Mukunda P. Das, Frederick Green
In the ballistic limit, the Landauer conductance steps of a mesoscopic quantum wire have been explained by coherent and dissipationless transmission of individual electrons across…
Comment on ``Four-Point Resistance of Individual Single-Wall Carbon Nanotubes'' by Gao et al. PRL 95, 196208 (2005)
Mukunda P. Das, Frederick Green, Jagdish S. Thakur
We remark on some delicate points that attend the physical meaning of intrinsic device resistance.
What is novel in quantum transport for mesoscopics?
Mukunda P Das, Frederick Green
The understanding of mesoscopic transport has now attained an ultimate simplicity. Indeed, orthodox quantum kinetics would seem to say little about mesoscopics that has not been re…
Conservation, Dissipation, and Ballistics: Mesoscopic Physics beyond the Landauer-Buettiker Theory
Frederick Green, Mukunda P. Das
The standard physical model of contemporary mesoscopic noise and transport consists in a phenomenologically based approach, proposed originally by Landauer and since continued and…
Where is the Shot Noise of a Quantum Point Contact?
Frederick Green, Jagdish S. Thakur, Mukunda P. Das
Reznikov et al. (Phys. Rev. Lett. 75, 3340 (1995)) have presented definitive observations of nonequilibrium noise in a quantum point contact. Especially puzzling is the "anomalous"…
Quantum Point Contacts and Beyond: New Results on Mesoscopic Conductance and Fluctuations
Mukunda P. Das, Frederick Green, Jagdish S. Thakur
We summarize the main results of a microscopically based kinetic theory, applicable to open quantum point contacts (QPCs) driven up to high fields. The governing role of gauge inva…
Landauer formula without Landauer's assumptions
Mukunda P. Das, Frederick Green
The Landauer formula for dissipationless conductance lies at the heart of modern electronic transport, yet it remains without a clear microscopic basis. We analyze the Landauer for…
The Landauer Formula: a Magic Mantra Revisited
Mukunda P. Das, Frederick Green
We review the conceptual structure of the Landauer theory of electron transport in the light of quantum kinetics, the orthodox framework for describing conductance at all scales. I…
Mesoscopic Transport as Many-Body Physics
Frederick Green, Mukunda P. Das
We show that a completely orthodox and conserving Landau-Silin approach to current fluctuations in quantum point contacts accounts for the major, and as yet unexplained, peak struc…
Transport, Noise, and Conservation in the Electron Gas: How to Build a Credible Mesoscopic Theory
Frederick Green, Mukunda P. Das
The Boltzmann-Landau-Silin and Landauer-Buettiker-Imry theories of electron transport are shown to be mutually incompatible. The first respects microscopic gauge invariance, electr…
Classical to quantum crossover in high-current noise of one-dimensional ballistic wires
Frederick Green, Mukunda P Das
Microscopic current fluctuations are inseparable from conductance. We give an integral account of both quantized conductance and nonequilibrium thermal noise in one-dimensional bal…
Shot Noise in Mesoscopic Quantum Systems
M. P. Das, F. Green
We examine critically the idea that fractional charges may carry electrical current in a conductor, much as do the normal electrons in a metallic Fermi liquid. We explore a range o…
Comment on ``Anomalous crossover between thermal and shot noise in macroscopic diffusive conductors''
Mukunda P. Das, Frederick Green
Shot noise is not normally evident in bulk solid-state conductors, since it is strongly attenuated by inelastic collisions. The ``anomalous'' emergence of macroscopic shot noise is…
On the "anomalous" resurgence of shot noise in long conductors
Mukunda P Das, Frederick Green
There has been renewed interest in the physics of the so-called crossover for current fluctuations in mesoscopic conductors, most recently involving the possibility of its appearan…
High-field noise in metallic diffusive conductors
Frederick Green, Mukunda P Das
We analyze high-field current fluctuations in degenerate conductors by mapping the electronic Fermi-liquid correlations at equilibrium to their semiclassical non-equilibrium form.…
Coulomb screening in mesoscopic noise: a kinetic approach
Frederick Green, Mukunda P Das
Coulomb screening, together with degeneracy, is characteristic of the metallic electron gas. While there is little trace of its effects in transport and noise in the bulk, at mesos…
Kinetic Theory and Mesoscopic Noise
M. P. Das, F. Green
In the theory of noise processes for mesoscopic conductors, the relationship between shot noise and hot-electron noise is absolutely fundamental to understanding the underlying mic…