arXiv subjects

Jesus Inarrea

Publications and source records attributed to Jesus Inarrea.

At least 19 recordsLinked to original sources

arXiv2025

Quantum superposition in ultra-high mobility 2D photo-transport

We investigate the striking properties that magnetoresistance of irradiated two-dimensional electron systems presents when their mobility is ultrahigh and temperature is low (T =0.5 K). Such as, an abrupt magnetoresistance collapse at low magnetic field and a resonance peak shift to the second harmonic (2wc = w), wc and w being the cyclotron and radiation frequencies respectively. We appeal to the principle of quantum superposition of coherent states and obtain that Schrodinger cat states (even and odd) are key to explain magnetoresistance at these extreme mobilities. On the one hand, the Schodinger cat states system oscillates with 2wc, thus being responsible of the resonance peak shift. On the other hand, we obtain that Schrodinger cat states-based scattering processes give rise to a destructive effect when the odd states are involved, leading to a magnetoresistance collapse. The Aharonov-Bohm effect plays a central role in the latter, turning even cat states into odd ones. We show that ultra-high mobility two-dimensional electron systems could make a promising bosonic mode-based platform for quantum computing.

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arXiv2023

Coherent states and their superpositions (cat states) in microwave-induced resistance oscillations

We report a novel theoretical approach on the microwave-induced resistance oscillations based on the coherent states of the quantum harmonic oscillator. We first obtain an expression for the coherent states of driven-quantum harmonic oscillators that are used, in the model of microwaveinduced electron orbits, to calculate magnetoresistance under radiation. Thus, we find that the principle of minimum uncertainty of coherent states, involving time and energy, is at the heart of photo-oscillations and zero resistance states. Accordingly, we are able to explain important experimental evidence of this remarkable effect. Such as the physical origin of oscillations, their periodicity with the inverse of the magnetic field, their peculiar minima and maxima positions and the existence of zero resistance states. We apply our theory to the case of ultra-high mobility samples where we appeal to the principle of quantum superposition of coherent states and obtain that Schrodinger cat states (even and odd coherent states) are key to explain magnetoresistance at these extreme mobilities. With them we explain the, experimentally obtained, magnetoresistance resonance peak shift to a magnetic field where the cyclotron frequency equals half the radiation frequency. This effect is similar to the one described in quantum optics as a second harmonic generation process. We also explain the magnetoresistance collapse, that take place in the dark and with light. This effect is known as giant negative magnetoresistance. We generalize our results to study the case of a three-component or triangular Schrodinger cat state.

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arXiv2021

Radiation-induced magnetoresistance oscillations with massive Dirac fermions

We report on a theoretical study on the rise of radiation-induced magnetoresistance oscillations in two-dimensional systems of massive Dirac fermions. We study the bilayer system of monolayer graphene and hexagonal boron nitride (h-BN/graphene) and the trilayer system of hexagonal boron nitride encapsulated graphene (h-BN/graphene/h-BN). We extend the radiation-driven electron orbit model that was previously devised to study the same oscillations in two-dimensional systems of Schr\"odinger electrons (GaAs/AlGaAS heterostructure) to the case of massive Dirac fermions. In the simulations we obtain clear oscillations for radiation frequencies in the terahertz and far-infrared bands. %which contrasts with the two-dimensional Schrodinger electrons case, %that are mainly sensitive to microwave frequencies. We investigate also the power and temperatures dependence. For the former we obtain similar results as for Schr\"odinger electrons and predict the rise of zero resistance states. For the latter we obtain a similar qualitatively dependence but quantitatively different when increasing temperature. While in GaAs the oscillations are wiped out in a few degrees, interestingly enough, for massive Dirac fermions, we obtain observable oscillations for temperatures above $100$ K and even at room temperature for the higher frequencies used in the simulations.

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arXiv2020

Resonance peak shift in the photo-current of ultrahigh-mobility two-dimensional electron systems

We report on a theoretical study on the rise of strong peaks at the harmonics of the cyclotron resonance in the irradiated magnetoresistance in ultraclean two-dimensional electron systems. The motivation is the experimental observation of a totally unexpected strong resistance peak showing up at the second harmonic. We extend the radiation-driven electron orbit model (previously developed to study photocurrent oscillations and zero resistance states) to a ultraclean scenario that implies longer scattering time and longer mean free path. Thus, when the mean free path is equivalent, in terms of energy, to twice the cyclotron energy ($2\hbar w_{c}$), the electron behaves as under an effective magnetic field twice the one really applied. Then, at high radiation power and/or low temperature, a resistance spike can be observed {\it at the second harmonic}. For even cleaner samples the energy distance could increase to three or four times the cyclotron energy giving rise to resistance peaks at higher harmonics (third, fourth, etc.), i.e., a resonance peak shift to lower magnetic fields as the quality of the sample increases. Thus, by selecting the sample mobility one automatically would select the radiation resonance response without altering the radiation frequency.

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arXiv2018

Beating pattern in radiation-induced oscillatory magnetoresistance in 2DES: coupling of plasmon-like and acoustic phonon modes

We present a microscopic theory on the observation of a beating pattern in the radiation-induced magnetoresistance oscillations at very low magnetic field. We con- sider that such a beating pattern develops as a result of the coupling between two oscillatory components: the first is a system of electron Landau states being harmon- ically driven by radiation. The second is a lattice oscillation, i.e., an acoustic phonon mode. We analyze the dependence of the beating pattern on temperature, radiation frequency and power. We conclude that the beating pattern is an evidence of the radiation-driven nature of the irradiated Landau states that makes them behave as a collective plasma oscillation at the radiation frequency. Thus, the frequency of such plasmons could be tuned from microwave to terahertz in the same nanodevice with an apparent technological application.

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arXiv2017

Radiation-induced resistance oscillations in 2D electron systems with strong Rashba coupling

We present a theoretical study on the effect of radiation on the mangetoresistance of two-dimensional electron systems with strong Rashba spint-orbit coupling. We want to study the interplay between two well-known effects in these electron systems: the radiation-induced resistance oscillations and the typical beating pattern of systems with intense Rashba interaction. We analytically derive an exact solution for the electron wave function corresponding to a total Hamiltonian with Rashba and radiation terms. We consider a perturbation treatment for elastic scattering due to charged impurities to finally obtain the magnetoresistance of the system. Without radiation we recover a beating pattern in the amplitude of the Shubnikov de Hass oscillations: a set of nodes and antinodes in the magnetoresistance. In the presence of radiation this beating pattern is strongly modified following the profile of radiation-induced magnetoresistance oscillations. We study their dependence on intensity and frequency of radiation, including the teraherzt regime.

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arXiv2016

Microscopic theory for radiation-induced Zero-Resistance States in 2D electron systems: Franck-Condon blockade

We present a microscopic model on radiation-induced zero resistance states according to a novel approach: Franck-Condon physics and blockade. Zero resistance states rise up from radiation-induced magnetoresistance oscillations when the light intensity is strong enough. The theory starts off with the {\it radiation-driven electron orbit model} that proposes an interplay of the swinging nature of the radiation-driven Landau states and the presence of charged impurity scattering. When the intensity of radiation is high enough it turns out that the driven-Landau states (vibrational states) involved in the scattering process are spatially far from each other and the corresponding electron wave functions do not longer overlap. As a result, it takes place a drastic suppression of the scattering probability and then current and magnetoresistance exponentially drop. Finally zero resistance states rise up. This is an application to magnetotransport in two dimensional electron systems of the Franck-Condon blockade, based on the Franck-Condon physics which in turn stems from molecular vibrational spectroscopy.

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arXiv2016

Linear polarization study of microwave-radiation-induced magnetoresistance oscillations: Comparison of power dependence to theory

We present an experimental study of the microwave power and the linear polarization angle dependence of the microwave-induced magnetoresistance oscillations in the high-mobility GaAs/AlGaAs two-dimensional electron system. Experimental results show the sinusoidal dependence of the oscillatory magnetoresistance extrema as a function of the polarization angle. Yet, as the microwave power increases, the angular dependence includes additional harmonic content, and it begins to resemble the absolute value of the cosine function. We present a theory to explain such peculiar behavior.

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arXiv2016

Terahertz-induced resistance oscillations in high mobility two-dimensional electron systems

We report on a theoretical work on magnetotransport under terahertz radiation with high mobility two-dimensional electron systems. We focus on the interaction between the obtained radiation-induced magnetoresistance oscillations (RIRO) and the Shubnikov-de Haas (SdHO) oscillations. We study two effects experimentally obtained with this radiation. First, the observed disappearance of the SdHO oscillations simultaneously with the vanishing resistance at the zero resistance states region. And secondly the strong modulation of the SdHO oscillations at sufficient terahertz radiation power. We conclude that both effects share the same physical origin, the interference between the average advanced distance by the scattered electron between irradiated Landau states, (RIRO), and the available initial density of states at a certain magnetic field, (SdHO). Thus, from a physical standpoint, what the terahertz experiments and theoretical simulations reveal is, on the one hand, the oscillating nature of the Landau states subjected to radiation and, on the other hand, how they behave in the presence of scattering.

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arXiv2016

Evidence of radiation-driven Landau states in 2D electron systems: magnetoresistance oscillations phase shift

We provide the ultimate explanation of one of the core features of microwave-induced magnetoresistance oscillations in high mobility two dimensional electron systems: the 1/4-cycle phase shift of minima. We start with the radiation-driven electron orbits model with the novel concept of scattering flight-time between Landau states. We calculate the extrema and nodes positions obtaining an exact coincidence with the experimental ones. The main finding is that the physical origin of the phase shift is a delay of $\fracπ{2}$ of the radiation-driven Landau guiding center with respect to radiation, demonstrating the oscillating nature of the irradiated Landau states. We analyze the dependence of this minima on radiation frequency and power and its possible shift with the quality of the sample

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arXiv2012

Effect of a in-plane magnetic field on the microwave assisted magnetotransport in a two-dimensional electron system

In this work we present a theoretical approach to study the effect of an in-plane (parallel) magnetic field on the microwave-assisted transport properties of a two-dimensional electron system. Previous experimental evidences show that microwave-induced resistance oscillations and zero resistance states are differently affected depending on the experimental set-up: two magnetic fields (two-axis magnet) or one tilted magnetic field. In the first case, experiments report a clear quenching of resistance oscillations and zero resistance states. In a tilted field, one obtains oscillations displacement and quenching but the latter is unbalanced and less intense. In our theoretical proposal we explain these results in terms of the microwave-driven harmonic motion performed by the electronic orbits and how this motion is increasingly damped by the in-plane field.

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arXiv2012

Influence of linearly polarized radiation on magnetoresistance in irradiated two-dimensional electron systems

We study the influence of the polarization angle of linear radiation on the radiation-induced magnetoresistance oscillations in two-dimensional electron systems and examine the polarization immunity on the temperature and quality of the sample. We have applied the radiation-driven electron orbits model obtaining that the magnetoresistance is affected by the orientation of the electric field of linearly polarized radiation when dealing with high quality samples and low temperatures. Yet, for lower quality samples and higher temperature, we recover polarization immunity in the radiation driven magnetoresistance oscillations. This could be of interest for future photoelectronics in high quality mesoscopic devices. VC 2012 American Institute of Physics

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arXiv2012

Giant off-resonance resistance spike related phenomena in irradiated ultraclean two-dimensional electron systems

We report on theoretical studies of a recently discovered strong radiation-induced magnetoresistance spike obtained in ultraclean two-dimensional electron systems at low temperatures. The most striking feature of this spike is that it shows up on the second harmonic of the cyclotron resonance and with an amplitude that can reach an order of magnitude larger than the radiation-induced resistance oscillations. We apply the radiation-driven electron orbits model in the ultraclean scenario. Accordingly, we calculate the elastic scattering rate (charged impurity) which will define the unexpected resonance spike position. We also obtain the inelastic scattering rate (phonon damping), that will be responsible of the large spike amplitude. We present a microscopical model to explain the dependence of the Landau level width on the magnetic field for ultraclean samples. We find that this dependence explains the experimental shift of the resistance oscillations with respect to the magnetic field found in this kind of samples. We study also recent results on the influence of an in-plane magnetic field on the spike. We are able to reconcile the obtained different experimental response of both spike and resistance oscillations versus an increasing in-plane field. The same model on the variation of the LL width, allows us to explain such surprising results based in the increasing disorder in the sample caused by the in-planed magnetic field. Calculated results are in good agreement with experiments. These results would be of special interest in nanophotonics; they could lead to the design of novel ultrasensitive microwave detectors.

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arXiv2011

Microwave-induced resistance oscillations and zero-resistance states in 2D electron systems with two occupied subbands

We report on theoretical studies of recently discovered microwave-induced resistance oscillations and zero resistance states in Hall bars with two occupied subbands. In the same results, resistance presents a peculiar shape which appears to have a built-in interference effect not observed before. We apply the microwave-driven electron orbit model, which implies a radiation-driven oscillation of the two-dimensional electron system. Thus, we calculate different intra and inter-subband electron scattering rates and times that are revealing as different microwave-driven oscillations frequencies for the two electronic subbands. Through scattering, these subband-dependent oscillation motions interfere giving rise to a striking resistance profile. We also study the dependence of irradiated magnetoresistance with power and temperature. Calculated results are in good agreement with experiments.

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arXiv2011

Multiple photoexcitation of two-dimensional electron systems: bichromatic magnetoresistance oscillations revisited

We analyze theoretically magnetoresistance of high mobility two-dimensional electron systems being illuminated by multiple radiation sources. In particular, we study the influence on the striking effect of microwave-induced resistance oscillations. We consider moderate radiation intensities without reaching the zero resistance states regime. We use the model of radiation-driven Larmor orbits extended to several light sources. First, we study the case of two different radiations polarized in the same direction with different or equal frequencies. For both cases we find a regime of superposition or interference of harmonic motions. When the frequencies are different, we obtain a modulated magnetoresistance response with pulses and beats. On the other hand, when the frequencies are the same, we find that the final result will depend on the phase difference between both radiation fields going from an enhanced response to a total collapse of oscillations, reaching an outcome similar to darkness. Finally, we consider a multiple photoexcitation case (three different frquencies) where we propose the two-dimensional electron system as a potential nanoantenna device for microwaves.

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arXiv2010

Sub-linear radiation power dependence of photo-excited resistance oscillations in two-dimensional electron systems

We find that the amplitude of the $R_{xx}$ radiation-induced magnetoresistance oscillations in GaAs/AlGaAs system grows nonlinearly as $A \propto P^α$ where $A$ is the amplitude and the exponent $α< 1$. %, with $α\rightarrow 1/2$ in %the low temperature limit. This striking result can be explained with the radiation-driven electron orbits model, which suggests that the amplitude of resistance oscillations depends linearly on the radiation electric field, and therefore on the square root of the power, $P$. We also study how this sub-linear power law varies with lattice temperature and radiation frequency.

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arXiv2008

Driving Weiss oscillations to Zero Resistance States by Microwave Radiation

In this work we present a theoretical model to study the effect of microwave radiation on Weiss oscillations. In our proposal Weiss oscillations, produced by an spatial periodic potential, are modulated by microwave radiation due to an interference effect between both, space and time-dependent, potentials. The final magnetoresistance depends mainly on the spatial period of the spatial potential and the frequency of radiation. Depending on the values of these parameters, we predict that Weiss oscillations can reach zero resistance states. On the other hand, these dissipationless transport states, created just by radiation, can be destroyed by the additional presence of a periodic space-dependent potential. Then by tuning the spatial period or the radiation frequency, the magnetoresistance can be strongly modified.

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arXiv2008

Effect of frequency and temperature on microwave-induced magnetoresistance oscillations in two-dimensional electron systems

Experimental results on microwave-induced magnetoresistance oscillation in two-dimensional electron systems show a similar behavior of these systems regarding temperature and microwave frequency. It is found that these oscillations tend to quench when frequency or temperature increase, approaching magnetoresistance to the response of the dark system. In this work we show that this experimental behavior can be addressed on the same theoretical basis. Microwave radiation forces the electron orbits to move back and forth being damped by interaction with the lattice. We show that this damping depends dramatically on microwave frequency and also on temperature. An increase in frequency or temperature gives rise to an increase in the lattice damping producing eventually a quenching effect in the magnetoresistance oscillations.

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