Electro-Thermal Transport in Quantum Point Contact Nanodevice

Aly, Arafa H.; Hwangbo, Chang Kwon

doi:10.1007/s10765-008-0550-6

Cited by 3 publications

(2 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These limits are the interest for our work. The manipulation of the quantum point contact [24,25] (QPC) connector width w can induce different transport regimes in these systems [26,27], e.g. at small w values we observe Coulomb blockade peaks in the conductance, for intermediate values we arrive at the Kondo transport regime and, finally, for high values Fano resonances are found.…”

Section: Introductionmentioning

confidence: 99%

Magneto-conductance fingerprints of purely quantum states in the open quantum dot limit

Mendoza

Ujevic

2012

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

We present quantum magneto-conductance simulations, at the quantum low energy condition, to study the open quantum dot limit. The longitudinal conductance G(E,B) of spinless and non-interacting electrons is mapped as a function of the magnetic field B and the energy E of the electrons. The quantum dot linked to the semi-infinite leads is tuned by quantum point contacts of variable width w. We analyze the transition from a quantum wire to an open quantum dot and then to an effective closed system. The transition, as a function of w, occurs in the following sequence: evolution of quasi-Landau levels to Fano resonances and quasi-bound states between the quasi-Landau levels, followed by the formation of crossings that evolve to anti-crossings inside the quasi-Landau level region. After that, Fano resonances are created between the quasi-Landau states with the final generation of resonant tunneling peaks. By comparing the G(E,B) maps, we identify the closed and open-like limits of the system as a function of the applied magnetic field. These results were used to build quantum openness diagrams G(w,B). Also, these maps allow us to determine the w-limit value from which we can qualitatively relate the closed system properties to the open one. The above analysis can be used to identify single spinless particle effects in experimental measurements of the open quantum dot limit.

show abstract

Section: Introductionmentioning

confidence: 99%

Magneto-conductance fingerprints of purely quantum states in the open quantum dot limit

Mendoza

Ujevic

2012

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…As examples, we can mention the quantum Hall effect 1,2 and the conductance quantization. 3,4 To understand the mechanics of quantum interference that controls these effects as a function of the magnetic field, 5,6 the use of electrostatic confinement through metallics gates 7 devices as quantum wire 8,9 ͑QW͒, quantum point contacts 10,11 ͑QPCs͒, and open quantum dots 12,13 ͑OQDs͒ are adequate. In this context, the combination of electrostatic and magnetic confinement results in an elegant and useful form to manipulate the quantum interference of the electronic states.…”

Section: Introductionmentioning

confidence: 99%

Fingerprints of transverse and longitudinal coupling between induced open quantum dots in the longitudinal magnetoconductance through antidot lattices

Ujevic

Mendoza

2010

Phys. Rev. B

View full text Add to dashboard Cite

We propose numerical simulations of longitudinal magnetoconductance through a finite antidot lattice located inside an open quantum dot with a magnetic field applied perpendicular to the plane. The system is connected to reservoirs using quantum point contacts. We discuss the relationship between the longitudinal magnetoconductance and the generation of transversal couplings between the induced open quantum dots in the system. The system presents longitudinal magnetoconductance maps with crossovers ͑between transversal bands͒ and closings ͑longitudinal decoupling͒ of fundamental quantum states related to the open quantum dots induced by the antidot lattice. A relationship is observed between the distribution of antidots and the formed conductance bands, allowing a systematic follow up of the bands as a function of the applied magnetic field and quantum point-contact width. We observed a high conductance intensity ͓between n and ͑n +1͒ quantum of conductance, n =1,2,. . .͔ in the regions of crossover and closing of states. This suggests transversal couplings between the induced open quantum dots of the system that can be modulated by varying both the antidots potential and the quantum point-contact width. A new continuous channel ͑not expected͒ is induced by the variation in the contact width and generate Fano resonances in the conductance. These resonances can be manipulated by the applied magnetic field.

show abstract

Spin-dependent heat and thermoelectric currents in a Rashba ring coupled to a photon cavity

Abdullah

Tang

Manolescu

et al. 2018

Physica E: Low-dimensional Systems and Nanostructures

View full text Add to dashboard Cite

Abstract. Spin-dependent heat and thermoelectric currents in a quantum ring with Rashba spin-orbit interaction placed in a photon cavity are theoretically calculated. The quantum ring is coupled to two external leads with different temperatures. In a resonant regime, with the ring structure in resonance with the photon field, the heat and the thermoelectric currents can be controlled by the Rashba spin-orbit interaction. The heat current is suppressed in the presence of the photon field due to contribution of the two-electron and photon replica states to the transport while the thermoelectric current is not sensitive to changes in parameters of the photon field. Our study opens a possibility to use the proposed interferometric device as a tunable heat current generator in the cavity photon field.

show abstract

Electro-Thermal Transport in Quantum Point Contact Nanodevice

Cited by 3 publications

References 14 publications

Magneto-conductance fingerprints of purely quantum states in the open quantum dot limit

Magneto-conductance fingerprints of purely quantum states in the open quantum dot limit

Fingerprints of transverse and longitudinal coupling between induced open quantum dots in the longitudinal magnetoconductance through antidot lattices

Spin-dependent heat and thermoelectric currents in a Rashba ring coupled to a photon cavity

Contact Info

Product

Resources

About