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Featured researches published by Chen-an Hsu.


Physical Review B | 2017

Nuclear-spin-induced localization of edge states in two-dimensional topological insulators

Chen-Hsuan Hsu; Peter Stano; Jelena Klinovaja; Daniel Loss

We investigate the influence of nuclear spins on the resistance of helical edge states of two-dimensional topological insulators (2DTIs). Via the hyperfine interaction, nuclear spins allow electron backscattering, otherwise forbidden by time reversal symmetry. We identify two backscattering mechanisms, depending on whether the nuclear spins are ordered or not. Their temperature dependence is distinct but both give resistance, which increases with the edge length, decreasing temperature, and increasing strength of the electron-electron interaction. Overall, we find that the nuclear spins will typically shut down the conductance of the 2DTI edges at zero temperature.


Bulletin of the American Physical Society | 2016

Long-distance entanglement of spin qubits via quantum Hall edge states

Guang Yang; Chen-Hsuan Hsu; Peter Stano; Jelena Klinovaja; Daniel Loss

The implementation of a functional quantum computer involves entangling and coherent manipulation of a large number of qubits. For qubits based on electron spins confined in quantum dots, which are among the most investigated solid-state qubits at present, architectural challenges are often encountered in the design of quantum circuits attempting to assemble the qubits within the very limited space available. Here, we provide a solution to such challenges based on an approach to realizing entanglement of spin qubits over long distances. We show that long-range Ruderman-Kittel-Kasuya-Yosida interaction of confined electron spins can be established by quantum Hall edge states, leading to an exchange coupling of spin qubits. The coupling is anisotropic and can be either Ising-type or XY-type, depending on the spin polarization of the edge state. Such a property, combined with the dependence of the electron spin susceptibility on the chirality of the edge state, can be utilized to gain valuable insights into the topological nature of various quantum Hall states.


Physical Review B | 2015

Antiferromagnetic nuclear spin helix and topological superconductivity in

Chen-Hsuan Hsu; Peter Stano; Jelena Klinovaja; Daniel Loss

We investigate the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction arising from the hyperfine coupling between localized nuclear spins and conduction electrons in interacting


arXiv: Mesoscale and Nanoscale Physics | 2018

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Chen-Hsuan Hsu; Daniel Loss; Jelena Klinovaja; Peter Stano

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arXiv: Mesoscale and Nanoscale Physics | 2018

C nanotubes

Peter Stano; Chen-Hsuan Hsu; Marcel Serina; Leon Camenzind; D. M. Zumbühl; Daniel Loss

C carbon nanotubes. Using the Luttinger liquid formalism, we show that the RKKY interaction is sublattice dependent, consistent with the spin susceptibility calculation in noninteracting carbon nanotubes, and it leads to an antiferromagnetic nuclear spin helix in finite-size systems. The transition temperature reaches up to tens of mK, due to a strong boost by a positive feedback through the Overhauser field from ordered nuclear spins. Similar to GaAs nanowires, the formation of the helical nuclear spin order gaps out half of the conduction electrons, and is therefore observable as a reduction of conductance by a factor of 2 in a transport experiment. The nuclear spin helix leads to a density wave combining spin and charge degrees of freedom in the electron subsystem, resulting in synthetic spin-orbit interaction, which induces non-trivial topological phases. As a result, topological superconductivity with Majorana fermion bound states can be realized in the system in the presence of proximity-induced superconductivity without the need of fine tuning the chemical potential. We present the phase diagram as a function of system parameters, including the pairing gaps, the gap due to the nuclear spin helix, and the Zeeman field perpendicular to the helical plane.


arXiv: Mesoscale and Nanoscale Physics | 2018

Majorana Kramers pairs in higher-order topological insulators

Yosuke Sato; Sadashige Matsuo; Chen-Hsuan Hsu; Peter Stano; Kento Ueda; Yuusuke Takeshige; Hiroshi Kamata; Joon Sue Lee; Borzoyeh Shojaei; Kaushini Wickramasinghe; Javad Shabani; Chris J. Palmstrøm; Yasuhiro Tokura; Daniel Loss; Seigo Tarucha


arXiv: Mesoscale and Nanoscale Physics | 2018

Gate-defined quantum dot in a strong in-plane magnetic field: spin-orbit and g-factor effects

Peter Stano; Chen-Hsuan Hsu; Leon Camenzind; Liuqi Yu; D. M. Zumbühl; Daniel Loss


Physical Review B | 2018

Strong Electron-Electron Interactions of a Tomonaga--Luttinger Liquid Observed in InAs Quantum Wires.

Chen-Hsuan Hsu; Peter Stano; Jelena Klinovaja; Daniel Loss


Bulletin of the American Physical Society | 2018

Gate-defined quantum dot in a strong in-plane magnetic field: orbital effects

Chen-Hsuan Hsu; Peter Stano; Daniel Loss


Bulletin of the American Physical Society | 2018

Effects of nuclear spins on the transport properties of the edge of two-dimensional topological insulators

Peter Stano; Chen-Hsuan Hsu; Liuqi Yu; Leon Camenzind; D. M. Zumbühl; Daniel Loss

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Peter Stano

Slovak Academy of Sciences

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