Robust electron pairing in the integer quantum hall effect regime

Choi, Hyung Kook; Sivan, Itamar; Rosenblatt, Amir; Heiblum, Moty; Umansky, V.; Mahalu, D.

doi:10.1038/ncomms8435

Cited by 48 publications

(92 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This suggests that although distinct edge states exist, below 1.2T they are too close to one another to be interfered independently; therefore at filling factors v bulk > 4 we show a single velocity measurement for each Landau level, while at lower fillings we show both spins when resolved. We also mention that we observe the same period-halving phenomenon in our device that was reported in previous interferometry experiments [28,29]; see Supp. Note 4 and Supp.…”

Section: Edge Mode Velocitysupporting

confidence: 90%

Aharonov–Bohm interference of fractional quantum Hall edge modes

et al. 2019

View full text Add to dashboard Cite

We demonstrate operation of a small Fabry-Perot interferometer in which highly coherent Aharonov-Bohm oscillations are observed in the integer and fractional quantum Hall regimes. Using a novel heterostructure design, Coulomb effects are drastically suppressed. Coherency of edge mode interference is characterized by the energy scale for thermal damping, T0 = 206mK at ν = 1. Selective backscattering of edge modes originating in the N = 0, 1, 2 Landau levels allows for independent determination of inner and outer edge mode velocities. Clear Aharonov-Bohm oscillations are observed at fractional filling factors ν = 2/3 and ν = 1/3. Our device architecture provides a platform for measurement of anyonic braiding statistics. arXiv:1901.08452v1 [cond-mat.mes-hall]

show abstract

Section: Edge Mode Velocitysupporting

confidence: 90%

Aharonov–Bohm interference of fractional quantum Hall edge modes

et al. 2019

View full text Add to dashboard Cite

show abstract

“…On the other hand, in the geometry of figure 1(b) the exponent diverges in all singularities and the frequency doubling does not occur ( figure 4(d)). Note also a similarity with the period doubling observed in an interferometry experiment [41].…”

Section: ò -supporting

confidence: 82%

“…These methods include interedge tunneling [5][6][7][8][9], probing upstream neutral modes [10][11][12][13][14][15][16][17][18], and various interferometry schemes [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. The latter approach stimulated much work on interferometry at other filling factors which brought several enigmatic experimental results [39][40][41]. In order to understand those results and interpret the experiments about topological orders in the second Landau level, it is imperative to achieve a better understanding of edge physics in the QHE.…”

Section: Introductionmentioning

confidence: 99%

Edge mode velocities in the quantum Hall effect from a dc measurement

Zucker

Feldman

2015

New J. Phys.

View full text Add to dashboard Cite

Because of the bulk gap, low energy physics in the quantum Hall effect is confined to the edges of the 2D electron liquid. The velocities of edge modes are key parameters of edge physics. They were determined in several quantum Hall systems from time-resolved measurements and high-frequency ac transport. We propose a way to extract edge velocities from dc transport in a point contact geometry defined by narrow gates. The width of the gates assumes two different sizes at small and large distances from the point contact. The Coulomb interaction across the gates depends on the gate width and affects the conductance of the contact. The conductance exhibits two different temperature dependencies at high and low temperatures. The transition between the two regimes is determined by the edge velocity. An interesting feature of the low-temperature I−V curve is current oscillations as a function of the voltage. The oscillations emerge due to charge reflection from the interface of the regions defined by the narrow and wide sections of the gates.

show abstract

“…In previous experiments, gating potentials and capacitances of similar samples were optimized in such a way [27,30,33,34].…”

Section: Methodsmentioning

confidence: 99%

Observation of quantum Hall interferometer phase jumps due to a change in the number of bulk quasiparticles

et al. 2020

View full text Add to dashboard Cite

We measure the magneto-conductance through a micron-sized quantum dot hosting about 500 electrons in the quantum Hall regime. In the Coulomb blockade, when the island is weakly coupled to source and drain contacts, edge reconstruction at filling factors between one and two in the dot leads to the formation of two compressible regions tunnel coupled via an incompressible region of filling factor ν = 1. We interpret the resulting conductance pattern in terms of a phase diagram of stable charge in the two compressible regions. Increasing the coupling of the dot to source and drain, we realize a Fabry-Pérot quantum Hall interferometer, which shows an interference pattern strikingly similar to the phase diagram in the Coulomb blockade regime. We interpret this experimental finding using an empirical model adapted from the Coulomb blockaded to the interferometer case. The model allows us to relate the observed abrupt jumps of the Fabry-Pérot interferometer phase to a change in the number of bulk quasiparticles. This opens up an avenue for the investigation of phase shifts due to (fractional) charge redistributions in future experiments on similar devices. :1910.12525v1 [cond-mat.mes-hall] arXiv

show abstract

Robust electron pairing in the integer quantum hall effect regime

Cited by 48 publications

References 33 publications

Aharonov–Bohm interference of fractional quantum Hall edge modes

Aharonov–Bohm interference of fractional quantum Hall edge modes

Edge mode velocities in the quantum Hall effect from a dc measurement

Observation of quantum Hall interferometer phase jumps due to a change in the number of bulk quasiparticles

Contact Info

Product

Resources

About