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mpa139 committed Dec 8, 2020
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Expand Up @@ -14,12 +14,10 @@ Our goal is to build instruments and develop techniques that enable us to addres

Here are some themes and techniques that we currently work on:

### Scanning tunneling noise spectroscopy (STNS)
We have developed a novel cryogenic MHz amplifier that allows us to measure not only the average tunneling current, but also its fluctuation! This has many applications: one can detect the fluctuations of the electronic states, peculiar tunneling processes, and shot noise. We have used this instrument to discover charge trapping in the insulating layer of the cuprates, connected to the c-axis mystery, and to measure the doubling of the charge due to Andreev processes to the superfluid in a lead sample.
**Scanning tunneling noise spectroscopy (STNS).** We have developed a novel cryogenic MHz amplifier that allows us to measure not only the average tunneling current, but also its fluctuation! This has many applications: one can detect the fluctuations of the electronic states, peculiar tunneling processes, and shot noise. We have used this instrument to discover charge trapping in the insulating layer of the cuprates, connected to the c-axis mystery, and to measure the doubling of the charge due to Andreev processes to the superfluid in a lead sample.


#### Mott physics and high-temperature superconductivity
Questions of interest include: (i), How does the Mott state collapse upon doping and how is this related to the complex phase diagram of high-temperature superconductors? (ii), What is the strange metal phase seen in correlated electron systems? Is this an exotic long-range entangled state? What is the mechanism of dissipation in that state? (iii), Why is the transition temperature in high-temperature superconductors so high? We have worked on iridates, rhodates, and cuprates.
**Mott physics and high-temperature superconductivity.** Questions of interest include: (i), How does the Mott state collapse upon doping and how is this related to the complex phase diagram of high-temperature superconductors? (ii), What is the strange metal phase seen in correlated electron systems? Is this an exotic long-range entangled state? What is the mechanism of dissipation in that state? (iii), Why is the transition temperature in high-temperature superconductors so high? We have worked on iridates, rhodates, and cuprates.

### Nanofabricated "Smart Tips"
![]({{ site.url }}{{ site.baseurl }}/images/respic/SmartTip.png){: style="width: 150px; float: left; margin: 0px 10px"}
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